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| hd1 |
https://dpaste.org/iDq8 anyone know how to fix this? |
[01:19]
|
| hd1 |
hd1's title: "dpaste/iDq8 (Plain Code)" |
[01:19]
|
| hd1 |
Do I need to downgrade to JDK14 or is it possible to use JDK15 with spring-boot? |
[01:20]
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| ernimril |
59 |
[01:28]
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| ernimril |
ernimril, 59 is the class file format version number of class files emitted when using --release 15. You will need Java 15 or higher to run these. |
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[02:11]
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| ScrambledRK |
using junit5, can I print a message if any asserts within my test fail? Without using assertAll? Do I need to wrap my test in try/catch and fail() on catch? The motivation is to make debugging a bit easier and print the given test parameters on fail. |
[02:11]
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| ScrambledRK |
Its a parameterized test and there are lots of cases; simply printing the arguments and expected result would help a lot to figure out whats wrong |
[02:12]
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| ricky_clarkson |
ScrambledRK: I use some parameterised test framework with JUnit4, it includes the arguments in the test name in the results |
[02:27]
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| ricky_clarkson |
testFoo(x=3, y=4): AssertionFailed... |
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| ScrambledRK |
ricky_clarkson: true, it does so for me too, but the inputs are rather long lists and it becomes a bit messy |
[02:47]
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| ScrambledRK |
but its not a big deal, I'll just log it in debug. thats omitted when build via maven but visible when testing locally |
[02:48]
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| ScrambledRK |
and thats enough for me I guess |
[02:48]
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| ScrambledRK |
thank you though |
[02:52]
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| dob1 |
if in a database I have a timestamp field (WITHOUT timezone) and I am querying for it, once I get it as java.sql.Timestamp it's corrret that getTime() on this object gives different values regarding of the timezone I am using (I am changing it as test using -Duser.timezone)? so I get always the same datetime when I stored it regarding of the timezone |
[02:56]
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[02:58]
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| kofc |
Hello. Does anyone know of an api library that has the ability to add a new element to a set/list and return the new list all in a single inline statement? |
[02:58]
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[03:02]
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| db |
kofc: with "new list" you mean - you want to create a new list consisting of the old list plus the new element wihtout modifying the original list=? |
[03:07]
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| kofc |
db: Yep |
[03:08]
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[03:08]
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| kofc |
Something like List<String> newList = oldList.add("Elem"); |
[03:08]
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| kofc |
I can't believe there is no fluent API for this in Java. |
[03:09]
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| db |
also that will modify oldList |
[03:09]
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| db |
maybe use a library like https://github.com/brianburton/java-immutable-collections |
[03:09]
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| db |
db's title: "GitHub - brianburton/java-immutable-collections: Efficient Immutable/Persistent Collections for Java" |
[03:09]
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| kofc |
There is something like EnumSet.of("newElem", oldSet.toArray(new String[0]); for Set creation, but this is fugly IMO. |
[03:09]
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| db |
Idk just googleguessing |
[03:09]
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[03:22]
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| [twisti] |
shame you cant leverage lomboks @Wither on existing classes |
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[03:52]
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| Koopz |
howdy, i'm getting really desperate now... I've got this java based reporting engine running on Server A which connected through JDBC to an informix db running on Server B. It worked just fine until yesterday when i restarted the informix database. From then on the reporting engine refused to connect to the database not giving me any errors or |
[03:53]
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| Koopz |
stacktraces whatsoever that could tell me what is wrong. Meanwhile i can connect to that very db through DBeaver just fine using the exact same information. |
[03:53]
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| Koopz |
i've restarted the reporting engine multiple times, even the server it was running on this morning, no change, still just telling me to contact the site admin. In the logs |
[03:54]
|
| yawkat consults the tea leaves |
[03:54]
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[03:55]
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| Koopz |
i don't know where to look anymore... how would i debug jdbc connection attempts? |
[03:55]
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| yawkat |
a debugger, i guess |
[03:56]
|
| yawkat |
contact the developers? |
[03:56]
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| Koopz |
TIBCO Jaspersoft? Doing support? xD |
[03:57]
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| ScrambledRK |
try to figure out if your jdbc driver implementation supports logs? |
[04:12]
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| ScrambledRK |
or the 3rd party involved :\ |
[04:12]
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| BluesBoy |
Koopz: did you try connecting to the db using dbeaver from server A or from some other PC? |
[04:13]
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[04:17]
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| Koopz |
i'm connecting from my computer which is not Server A, indeed |
[04:18]
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| Koopz |
just did a tcpdump to check if a connection to Server B is even created |
[04:19]
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| Koopz |
at least that seems to happen |
[04:22]
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| [twisti] |
Koopz: we dont really do tech support for other peoples apps that just happen to be written in java here |
[04:24]
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| [twisti] |
yawkat is right, contact the developers, they probably have an issue tracker for that kind of thing |
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[05:10]
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| AndroidDAW |
where can i find instructions for setting up JDK for development on Mac OS |
[05:17]
|
| AndroidDAW |
specifically i am getting fatal error: 'jni.h' file not found |
[05:17]
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| AndroidDAW |
for #include <jni.h> |
[05:17]
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| mbooth |
AndroidDAW: JDK comes with everything you need -- jni.h is in the "include" directory |
[05:19]
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| Diablo-D3 |
AndroidDAW: your name implies you want #android-dev |
[05:19]
|
| AndroidDAW |
hmm nvm, i seem to get this when invoking java --version |
[05:20]
|
| AndroidDAW |
Error: Could not create the Java Virtual Machine. |
[05:20]
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| AndroidDAW |
Error: A fatal exception has occurred. Program will exit. |
[05:20]
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| AndroidDAW |
Diablo-D3: im cross compiling for both mac os and android |
[05:20]
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| mbooth |
AndroidDAW: Just pass it to your compiler in the usual way for header directories, IIRC for gcc it's -I/path/to/include |
[05:20]
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| Diablo-D3 |
same with clang, since hes on a mac |
[05:21]
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| AndroidDAW |
i have this installed |
[05:22]
|
| AndroidDAW |
openjdk version "1.8.0_282" |
[05:22]
|
| AndroidDAW |
OpenJDK Runtime Environment Corretto-8.282.08.1 (build 1.8.0_282-b08) |
[05:22]
|
| AndroidDAW |
OpenJDK 64-Bit Server VM Corretto-8.282.08.1 (build 25.282-b08, mixed mode) |
[05:22]
|
| AndroidDAW |
mbooth: where would i find the directory that it is included in |
[05:23]
|
| AndroidDAW |
my env has no JAVA_HOME |
[05:23]
|
| Diablo-D3 |
its in the directory you installed java to |
[05:23]
|
| AndroidDAW |
/usr/bin/java -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java |
[05:23]
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| mbooth |
AndroidDAW: Usually it's /path/to/jdk/include |
[05:25]
|
| AndroidDAW |
`find /System/Library/Frameworks/JavaVM.framework -name jni.h` results in nothing |
[05:25]
|
| mbooth |
AndroidDAW: But Macs like to be different, and you know macs better than me |
[05:25]
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| AndroidDAW |
mbooth: i dont know where that is |
[05:25]
|
| mbooth |
Maybe you should find a mac os support channel |
[05:26]
|
| Diablo-D3 |
that directory structure doesnt even make sense |
[05:26]
|
| Diablo-D3 |
I dont remember the jvm looking that weird on osx the last time I used osx |
[05:26]
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| mbooth |
AndroidDAW: Did you try googling for "macos jni.h" ? |
[05:27]
|
| AndroidDAW |
im on Mac Os Catalina |
[05:27]
|
| Diablo-D3 |
but it packed it the same way its done on other OSes, so /some/mac/dir/java/bin/java for java itself, etc |
[05:27]
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| mbooth |
This is almost certainly not the best channel for teaching you how to use your OS ;-) |
[05:28]
|
| Diablo-D3 |
yup |
[05:28]
|
| Diablo-D3 |
maybe try a different distro instead of coretto? |
[05:29]
|
| mbooth |
Or just use |
[05:29]
|
| mbooth |
sdkman |
[05:29]
|
| mbooth |
SDKMAN is a tool for managing parallel installations of JVMs and tools on Mac/Linux/Unix. See http://sdkman.io/ - you can run it on Windows if you have a working Bash installation, too. To install java, you'd use "sdk install java" if you're wondering. |
[05:29]
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| AndroidDAW |
hmm it seems like i can use `/usr/libexec/java_home` to identify the JDK home |
[05:30]
|
| AndroidDAW |
$ /usr/libexec/java_home |
[05:30]
|
| AndroidDAW |
/Users/smallville7123/Library/Java/JavaVirtualMachines/corretto-1.8.0_282/Contents/Home |
[05:30]
|
| mbooth |
Hurrah |
[05:32]
|
| AndroidDAW |
how would i set it up so that i can use the "$(JAVA_HOME)/include" directory when compiling |
[05:33]
|
| AndroidDAW |
mbooth: :) |
[05:33]
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| Maldivia |
AndroidDAW: set your JAVA_HOME to point to the right place |
[05:33]
|
| Maldivia |
duh |
[05:33]
|
| AndroidDAW |
i did |
[05:34]
|
| mbooth |
AndroidDAW: You don't know how to set environment variables? |
[05:34]
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[05:34]
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| AndroidDAW |
but i also need to set the correct compiler flags as well right? |
[05:34]
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| Maldivia |
well, that is outside the scope of this channel |
[05:34]
|
| AndroidDAW |
so that its include directory is actually included |
[05:34]
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| Maldivia |
this is a Java channel, not gcc or whatever native compile you're using |
[05:34]
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| mbooth |
AndroidDAW: I mean we already told the compiler flag for gcc and clang is -I |
[05:35]
|
| caipiblack2 |
Hi, I have a question about the timers in JAVA ! Is it possible for a timer to interrupt a function ? Or can it only interrupt when functions are doing blocking task (delay, IO, ..) |
[05:35]
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| mbooth |
AndroidDAW: If you need more than that, you should find a support channel for your compiler |
[05:35]
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| Maldivia |
caipiblack2: depends how you've coded that method -- if that method reacts to interrupt events, then yes |
[05:35]
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| AndroidDAW |
hmm seems to be https://stackoverflow.com/a/37889423/14942779 |
[05:35]
|
| AndroidDAW |
AndroidDAW's title: "java - Where can I find the jni headers for Mac OS - Stack Overflow" |
[05:35]
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| caipiblack2 |
Maldivia : How did you know if a method react to interrupt events ? |
[05:37]
|
| AndroidDAW |
tho im just gonna use `export CPPFLAGS="-I $(JAVA_HOME)/include -I $(JAVA_HOME)/include/darwin $(CPPFLAGS)"` instead as mine uses bash by default |
[05:37]
|
| Maldivia |
AndroidDAW: Not on topic for this channel |
[05:37]
|
| AndroidDAW |
sorry |
[05:38]
|
| Maldivia |
caipiblack2: well, do the methods you call support InterrupedException? do you check for it yourself? is there another flag you check for to see if you should continue? |
[05:38]
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[05:38]
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| mbooth |
JCIP |
[05:38]
|
| mbooth |
caipiblack2, jcip is Java Concurrency In Practice, a book focused on implementing threaded and concurrent applications in Java. You can read more at http://jcip.net and buy a copy at http://amzn.to/1pujbTy |
[05:38]
|
| mbooth |
That's a good reference for concurrency |
[05:39]
|
| caipiblack2 |
The method that i don't want to be interrupt doesn't support "interruptedException" |
[05:39]
|
| caipiblack2 |
throw* |
[05:39]
|
| Maldivia |
well, then no |
[05:39]
|
| caipiblack2 |
Perfect! |
[05:39]
|
| caipiblack2 |
Thank you. |
[05:39]
|
| Maldivia |
unless it checks on some other flag |
[05:39]
|
| caipiblack2 |
Oh |
[05:39]
|
| Maldivia |
if I have a while (running) {...} -- well, then my code check on that field, right -- and changing it (in a thread-safe manner) would act as a flag for that method |
[05:40]
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| Maldivia |
many of the blocking IO methods in Java support the Thread.interrupted() flag for instance |
[05:41]
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[07:14]
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| n01d |
Does anyone know of a good book on algorythms? |
[07:15]
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[07:21]
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[07:30]
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| [twisti] |
try ##programming |
[07:32]
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[07:42]
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| mbooth |
"Al Gore Rhythms" Isn't that a book on vice-presidential dance moves? |
[07:45]
|
| Diablo-D3 |
get out |
[07:46]
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[08:00]
|
| n01d |
I mean in java |
[08:04]
|
| mbooth |
n01d: Algorithms are language agnostic |
[08:06]
|
| dreamreal |
morning |
[08:09]
|
| dreamreal |
n01d: look up sedgewick's books, BTW |
[08:10]
|
| dreamreal |
the channel blog also has some references on algorithms, if memory serves |
[08:10]
|
| dreamreal |
sedgewick's book on algorithms in java is good, because he knows his stuff, but the java in it is really primitive |
[08:13]
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[08:13]
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| n01d |
Hey why not start a channel like #english119? |
[08:15]
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[08:16]
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[08:25]
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[08:25]
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| dreamreal |
n01d: How do you know there isn't one |
[08:26]
|
| dreamreal |
have you looked? |
[08:26]
|
| dreamreal |
and what does that have to do with us |
[08:26]
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[08:54]
|
| n01d |
You could teach a class directly through irc |
[09:00]
|
| dreamreal |
topic |
[09:00]
|
| dreamreal |
The topic has several references for your perusal. That's why Chanserv msgs you to read the topic. Reading the topic and asking questions is a great way to get help. |
[09:00]
|
| dreamreal |
n01d: If you can't tell, I'm gently telling you that we don't care, get back on topic :) |
[09:01]
|
| Teckla |
Memory/garbage collection question: We have a JVM where work comes in, and we don't know what the memory requirements of the work will be (could be high). We "protect" ourselves by rejecting the work if the heap size is already >= 90%. -> |
[09:06]
|
| Teckla |
But this is causing a problem with the GC which seems to happily sit there with a >90% heap, even though a GC would reduce the heap size considerably. -> |
[09:06]
|
| Teckla |
(To 50% or lower, in most cases.) |
[09:06]
|
| Maldivia |
Teckla: use a GC that will periodically run the GC regardless of load then |
[09:06]
|
| Teckla |
Maldivia: Do you know how often it'll periodically run the GC? |
[09:07]
|
| Maldivia |
Teckla: unless you explicitly set an option, it won't |
[09:07]
|
| Teckla |
Maldivia: Ah ha. OK. Thanks. |
[09:08]
|
| Teckla |
Is it frowned upon to periodically run System.gc() yourself? |
[09:08]
|
| odinsbane |
Yes. |
[09:08]
|
| Maldivia |
yes |
[09:08]
|
| Maldivia |
and it might do absolutely nothing |
[09:08]
|
| Teckla |
Darn. Off the tops of your heads, do you know if G1GC supports the "periodically run the GC" feature? |
[09:08]
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| mbooth |
Teckla: Note that System.gc() is just a "suggestion", and will not guarantee it runs |
[09:08]
|
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[09:08]
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| Teckla |
(For various reasons, we must use G1GC.) |
[09:09]
|
| Teckla |
Or what the feature is named -- I can look it up. |
[09:09]
|
| Maldivia |
jep 346 |
[09:09]
|
| Maldivia |
'JEP 346: Promptly Return Unused Committed Memory from G1' can be found at http://openjdk.java.net/jeps/346 |
[09:09]
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[09:10]
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| mbooth |
Teckla: For tuning options see https://www.oracle.com/technical-resources/articles/java/g1gc.html |
[09:10]
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| mbooth |
mbooth's title: "Garbage First Garbage Collector Tuning" |
[09:10]
|
| jackiiilong |
is there spring channel |
[09:10]
|
| mbooth |
jackiiilong: Maybe, your client doesn't let you search the channel list? |
[09:11]
|
| Teckla |
Great! Thanks a bunch all :) |
[09:11]
|
| dreamreal |
jackiiilong: yes. |
[09:11]
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| Maldivia |
Teckla: basically, if you're using a new enoigh JVM, you can set the -XG1PeriodicGCInterval= setting to enable periodic gc, even when idle |
[09:11]
|
| Maldivia |
-XX:G1PeriodicGCInterval |
[09:11]
|
| jackiiilong |
yes ,there is |
[09:11]
|
| dreamreal |
Teckla: also, can you consider spinning up a secondary VM, a microcontainer or something, using messaging to process the jobs? |
[09:11]
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| dreamreal |
Teckla: then you would have the external container handle ONE job at a time (guaranteeing "space") and if you needed faster throughput you could spin up other containers; each one would give you the ability to process another job at a given time |
[09:12]
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| Teckla |
dreamreal: Alas, it takes ~20-30m to "spin up" one of these JVMs. |
[09:13]
|
| Teckla |
And they run on kind of expensive AWS VMs. We use ~60 GiB heaps. |
[09:13]
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| Maldivia |
well, if you could split them into smallers, perhaps the startup time would be significant lower, and also the required VM size would also be lower? |
[09:14]
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| dreamreal |
well, my thought is that if you had those containers, maybe they could use LESS room |
[09:14]
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| dreamreal |
i.e., what Maldivia just said |
[09:14]
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[09:14]
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| mbooth |
20-30minutes! AWS is made of potatoes, confirmed. |
[09:15]
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| Teckla |
We do indeed have a medium-term project to eject the parts of the code that cause the ~20-30m spin up time, as a side effect that'll make the heap much smaller too. We currently make direct Java calls into another team's API, which is what requires all the resources. We are changing those out to web calls to their JVMs (which they now support). |
[09:15]
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[09:16]
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| Maldivia |
mbooth: have you ever tried booting a SAP Hybris installation ? :D |
[09:17]
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| mbooth |
Maldivia: If by "booting" you mean "kicked with a booted foot" |
[09:17]
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[09:22]
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| Maldivia |
mbooth: well, in this case, considering it's SAP, I guess that's an appropriate analogy |
[09:27]
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[09:33]
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| ries |
any recommendation for a online 1Z0-817 course? This is for private person, so a 3000euro classical is unfortunatly out of the question |
[09:35]
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| mbooth |
What the heck is a "1Z0-817" course? |
[09:36]
|
| cheeser |
java cert stuff apparently. |
[09:37]
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| ries |
mbooth: well, english is not my native language? but I want to preperare for 1z0-817?. so I just want to get all the in?s and outs of java 11 comming from java 8? |
[09:38]
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| Teckla |
Thanks again, folks, for the GC help above ^^^ |
[09:39]
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| mbooth |
When I google for the "1Z0-817" syllabus, it just looks like the ToC from the tutorial? Is that right? |
[09:39]
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| mbooth |
Just do the tutorial :-p |
[09:39]
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| ries |
perhaps I should have said study guide? |
[09:39]
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| dreamreal |
ries: why not do the tutorial, if it's for java certification? Then read effective Java. Then take the cert course, and throw the certificate away. |
[09:53]
|
| ries |
unfortunatly, companies I currently work for somewhat cares for the cert (for good reasons) |
[09:54]
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| dreamreal |
there really are no GOOD reasons, they might care but it's still not a good reason, no matter what it is |
[09:55]
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| ries |
For them it?s just to set a baseline, that?s it? |
[09:56]
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| dreamreal |
see? not a good reason |
[09:56]
|
| ries |
it helps to seperate the script kiddies from the rest?. mind you, this is a company where people are working for +20 years? and people comming from different technologies so they don?t come in and hired with some knowledge set? |
[09:57]
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| ries |
I get what you are saying though... |
[09:57]
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[09:58]
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| dreamreal |
yeah, I get it: it's sort of a badge, a signal that someone had the time and commitment to go through certification |
[09:59]
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| dreamreal |
but it's sort of like a tattoo: having one doesn't mean anything more than you actually were willing to get a tattoo, if it's of a cross or something it doesn't mean you have any convictions, just that you're signalling those convictions |
[09:59]
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[10:00]
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[10:12]
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| dreamreal |
https://blogs.oracle.com/javamagazine/how-to-program-machine-learning-in-java-with-the-tribuo-library?source=:em:nw:mt::::RC_WWMK200429P00043:NSL400135485&elq_mid=186705&sh=1712822111912771813202291515214613&cmid=WWMK200429P00043C0021 |
[10:18]
|
| Maldivia |
lovely tracking info there :D |
[10:18]
|
| dreamreal |
yeah, strip that crap out, I guess :) |
[10:19]
|
| dreamreal |
https://blogs.oracle.com/javamagazine/how-to-program-machine-learning-in-java-with-the-tribuo-library |
[10:19]
|
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[10:20]
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| tang^ |
Thanks for stripping |
[10:24]
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[10:31]
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[10:31]
|
| cheeser |
woo woo! |
[10:33]
|
| AStorm |
hey, is there a way to create an entity that's essentially an alias for another in JPA? Normally subclassing requires a discriminator, but I don't want one; I need a mutable version of the entity and an Immutable one |
[10:38]
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| AStorm |
(because locking in JPA) |
[10:38]
|
| AStorm |
ah, forgot to mention, this is Hibernate where @Immutable comes from |
[10:41]
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| AStorm |
however Entity and subclassing come from JPA and it seems they either didn't make it possible to have a subclasses that are essentially a variant of the superclass with no new non-transient fields that is not discriminated in any way except by type |
[10:42]
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| AStorm |
there's MappedSuperclass for when the superclass does not matter, but in my case I want to have subclass be just the same as superclass except mutable |
[10:45]
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| cheeser |
sounds like a questionable design |
[10:45]
|
| AStorm |
questionable is that I have to do it because getting a mutable entity puts a database lock on it in SERIALIZED with no modifications to it |
[10:45]
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[10:46]
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[10:46]
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| AStorm |
theoretically readOnly on @Transactional should prevent this behavior, however this is implemented in newer Spring for hibernate than I can use |
[10:47]
|
| dreamreal |
also might be of interest: https://www.humblebundle.com/books/pocket-reference-guides-oreilly-books |
[10:48]
|
| AStorm |
(they implemented it in Spring 5.1...) |
[10:48]
|
| dreamreal |
dreamreal's title: "Humble Book Bundle: Pocket Reference Guides by O'Reilly (pay what you want and help charity)" |
[10:48]
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| AStorm |
Hibernate's Immutable is weird anyway, not an actual immutability or quarantee |
[10:57]
|
| AStorm |
can't cheat it with TABLE_PER_CLASS and same table |
[11:05]
|
| AStorm |
ffs Hibernate DWIM |
[11:05]
|
| AStorm |
Do I really have to be nasty and extract the fields into MappedSuperclass because :( |
[11:07]
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| cheeser |
sounds like you need to ask a hibernate forum instead of ranting here. clearly no one here knows the answer to your problem. |
[11:08]
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| AStorm |
I suppose |
[11:09]
|
| mbooth |
Programming, man. As 7 year old cousin said, "It's just typing!" |
[11:09]
|
| dreamreal |
AStorm: what are you trying to do? |
[11:10]
|
| mbooth |
So y'know, type harder :-) |
[11:10]
|
| cheeser |
mbooth: unless it's javascript |
[11:10]
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| AStorm |
dreamreal: so the problem is, I have a bunch of transactions that are and should be SERIALIZED; there are a few entities required for processing that are in essence immutable too |
[11:11]
|
| dreamreal |
okay |
[11:11]
|
| dreamreal |
and? |
[11:11]
|
| mbooth |
cheeser: Who writes javascript? I thought the cool kids rediscovered type systems and write typescript |
[11:11]
|
| cheeser |
¯\_(?)_/¯ |
[11:11]
|
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[11:12]
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| AStorm |
however, there is an admin page where you can modify those entities essentially, totally separate |
[11:12]
|
| AStorm |
now if I just use a mutable entity in SERIALIZED transaction, Hibernate takes a lock on the Entity in transaction and I hit an exception when saving and flushing an unrelated thing (cascade is not involved) |
[11:12]
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[11:12]
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| AStorm |
the actually not changed entity is bound to this serialized transaction for no good reason |
[11:14]
|
| mbooth |
AStorm: You need a twitter account :-) |
[11:14]
|
| AStorm |
and hibernate in case of SERIALIZED takes a row lock; this results in specifically ORA-08177 |
[11:14]
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| AStorm |
if entity is @Immutable hibernate does not take a row lock on it, which is all nice and solves my problem |
[11:15]
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[11:15]
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| AStorm |
however I still need the mutable version |
[11:15]
|
| muhaha |
is there any database cli ( like flyway,liqibase ) that can actually create databases ? |
[11:16]
|
| muhaha |
cli/library* |
[11:16]
|
| Maldivia |
both of those can |
[11:16]
|
| muhaha |
they can not |
[11:16]
|
| muhaha |
only schemas |
[11:16]
|
| cheeser |
dbunit |
[11:17]
|
| cheeser |
DbUnit is a JUnit extension targeted at database-driven projects that puts your database into a known state between test runs. See http://dbunit.sourceforge.net/ |
[11:17]
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| dreamreal |
AStorm: so you have a few options... one is to actually have a different admin *app* |
[11:18]
|
| AStorm |
(yes, which would take half a month to separate out of this pile of code, not an option as much as I'd like that) |
[11:19]
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| dreamreal |
You could also have the class mapped in via XML, and have teh class just be a POJO; the admin page would use the sessionfactory that had the mutable mapping, the app would use the immutable version |
[11:19]
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| AStorm |
very interesting and nasty, I'll check this out |
[11:19]
|
| dreamreal |
nasty? |
[11:19]
|
| AStorm |
see we don't have any XML mappings, this is all Spring Boot and as such everything is done in code and annotations |
[11:20]
|
| dreamreal shrugs |
[11:20]
|
| AStorm |
so this means I'd have to mangle current Hibernate configuration, whihc is autoconfiguration |
[11:22]
|
| AStorm |
to get it to ignore some entities, and drop them only in one of two factories |
[11:22]
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[11:23]
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| dreamreal |
don't know what else to tell you offhand |
[11:23]
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| AStorm |
it's fine, dirty hacks is where I'm at right now |
[11:23]
|
| dreamreal |
that's not a dirty hack, though :) |
[11:23]
|
| AStorm |
oh, or I could get the admin page to never modify entities, just construct new ones |
[11:23]
|
| mbooth |
be a rubber ducky |
[11:23]
|
| mbooth |
WHY WOULD I WANT TO? |
[11:23]
|
| AStorm |
that's because Immutable only affects update, not insert or delete |
[11:24]
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| dreamreal |
It's a little unusual in that the two mappings would be over the same schema, but eh, the metadata for the tables WOULD be different |
[11:24]
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[11:24]
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| mbooth |
Err, sorry javabot |
[11:24]
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| AStorm |
thanks, now I have 4 options |
[11:24]
|
| AStorm |
dreamreal++ |
[11:24]
|
| AStorm |
(or am I bad at giving karma) |
[11:25]
|
| tang^ |
dreamreal++ |
[11:25]
|
| tang^ |
dreamreal has a karma level of 2, tang^ |
[11:25]
|
| tang^ |
he has no karma anyway |
[11:25]
|
| AStorm |
dreamreal++ |
[11:26]
|
| AStorm |
dreamreal has a karma level of 3, AStorm |
[11:26]
|
| cheeser giggles |
[11:26]
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| dreamreal |
I liked it better the first time. |
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[12:33]
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| glowdemon1 |
https://gist.github.com/RobbeVW/89faedb21cdc974772cee97b07f02aab |
[12:35]
|
| glowdemon1 |
Hi. Does anyone know if there's a cleaner way to use WHERE IN with a SET when using the JdbcTemplate in Spring Boot? |
[12:35]
|
| glowdemon1 |
Right now I have to ",?".repeat(ids.size) and thats kinda gross |
[12:36]
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| yawkat |
postgres has an array contains |
[12:37]
|
| ernimril |
glowdemon1, I do not use JdbcTemplate, but jdbc does not really have any nice way to bind an array that works across databases |
[12:37]
|
| yawkat |
but yes thats generally what you have to do |
[12:37]
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| Maldivia |
glowdemon1: is there a reason you're not using the build in functionality for it? |
[12:38]
|
| Maldivia |
or at lieast the spring respository has support for List<Foo> findByIdIn(List<Long> ids); |
[12:39]
|
| glowdemon1 |
It's for my uni course |
[12:40]
|
| glowdemon1 |
Spring Hibernate comes after this, I guess they want to build on this |
[12:40]
|
| glowdemon1 |
I guess I'll have to come to terms with my perfectionism then. Thanks for the advice yall |
[12:41]
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| marccollin |
glowdemon1: there is spring data jdbc |
[12:42]
|
| Maldivia |
why no homework |
[12:43]
|
| Maldivia |
We understand you aren't asking us to do your homework. That's not why we don't answer. We don't because 1) You usually don't comprehend the answer and we get stuck in an endless loop of 'why', 2) You will understand, but you'll retort with "my professor doesn't want me to do it this way'. That's frustrating. 3) Homework questions are boring questions. We don't get paid. Your prof does. |
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[01:01]
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| dmlloyd |
there's a java discord server that will help with homework fwiw |
[01:06]
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| dmlloyd |
could start redirecting people there |
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| anovick |
is there a web-based Java IDE that can format the code? I'm using Repl.it but it can't do formatting apparently |
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| dreamreal |
Isn't Che web-based now? |
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| cheeser |
it is |
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| Maldivia |
VS Code :D |
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| ernimril |
anovick, why must it be web-based? |
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| Maldivia |
if it's just for formatting, https://github1s.com/github/.github - F1, >new document, paste code, ctrl-k m, select javascript, shift-alt-f (yes, I know javascript is not java, but that VS Code in browser has the javascript formatter installed, and not the java formatter, and it's close enough) |
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| anovick |
does anybody know why the formatted output looks worse than the input in this case?: https://codebeautify.org/javaviewer/cbe99728 |
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| Maldivia |
anovick: learn to always use {} |
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| anovick |
i mean the if-if-else-else are on the same external indentation |
[02:01]
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| anovick |
also, the else inside the first if is just dangling there |
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| ernimril |
anovick, they are using some bad parsing/syntax tree handling and end up with a mess. Partly due to your code being a mess. |
[02:02]
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| anovick |
it's apparently not the only formatter that does it |
[02:03]
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| anovick |
first two results on google lead to the same output of formatting |
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| yawkat |
have you tried following the suggestions from above? |
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| ries |
when doing this : https://education.oracle.com/java-programming-learning-subscription/ls_40805 do you will get a certificate inlaid with gold and diamonds? :D |
[02:32]
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| Maldivia |
ries: no, but you get the personal satisfaction of having contributed to Larry's next yacht |
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| ries |
Maldivia: I will take a piacture from the internet and put it on the desk? But to be honest, the The Musashi is a small Yacht? |
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| ries |
so I can imagine he ordered to make a new one |
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| dreamreal |
ugh, Jena is arguing about upgrading log4j1 to log4j2... and not, like, slf4j |
[03:01]
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| dreamreal |
which isn't perfect but it's a damn bit better than log4j |
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| Maldivia |
sure upgrade to log4j2... but use the slf4j API and then bind to log4j as the backend? :D |
[03:05]
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| dreamreal |
exactly |
[03:05]
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| dreamreal |
but they apparently mangle some of the configurations in a way that mostly binds them to log4j, which is kinda gross |
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| cheeser |
7 |
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| svm_invictvs |
Would you ever want to use HSQLDB in production? |
[03:41]
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| yawkat |
h2, but sure why not |
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| Maldivia |
depends on the production |
[03:47]
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| svm_invictvs |
Well, looking for an embedded databse in Java |
[03:48]
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| dreamreal |
for a specific embedded purpose, sure |
[03:48]
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| svm_invictvs |
Derby works as well |
[03:48]
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| dreamreal |
and I would use h2 over hsqldb, although I could be convinced to consider hypersql |
[03:48]
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| Maldivia |
in the license server software we distribute, we have an embedded h2 |
[03:48]
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| dreamreal |
svm_invictvs: h2 starts FAR more quickly |
[03:48]
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| svm_invictvs |
Is Derby a Red Had joke? |
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| svm_invictvs |
*Red Hat |
[03:49]
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| dreamreal |
svm_invictvs: no, it was an IBM DB |
[03:49]
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| svm_invictvs |
I see. |
[03:49]
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| dreamreal |
it's basically db2 in an embedded db |
[03:49]
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| Maldivia |
derby, or Java DB as it was called, was bundled with the JDK in Java 6 to 8 |
[03:51]
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| Maldivia |
with OracleJDK, that is |
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| ricky_clarkson |
Just out of curiosity, if mirrorbird gets banned for 180 days at a time, why do I see it back here before 180d? |
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| Maldivia |
ricky_clarkson: because the banlist is cleared from time to time |
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| Maldivia |
and then chanserv will auto-kick on join as long as it still knows about it |
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| ricky_clarkson |
Thanks. |
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| johnjay |
hmm. the tutorial for java on oracle's website is for jdk 8. i guess there's been changes since then for 15 |
[05:04]
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| Maldivia |
johnjay: there has been additions, yes, but those additions are not really Java 101 additions, so the tutorial is still good |
[05:05]
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| johnjay |
i see |
[05:05]
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| dreamreal |
Maldivia: I like cheeser's idea of crowdsourcing a new one, though |
[05:07]
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| Maldivia |
a new tutorial ? |
[05:07]
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| dreamreal |
yeah |
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| Maldivia |
for a starter, the java 8 tutorial + a ToC with links to info about new features, could a good starting point? |
[05:11]
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| dreamreal |
yeah, but then we'd run into oracle's licensing on the CURRENT tutorial |
[05:12]
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| Maldivia |
well, refence that as intro, and go from there? |
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| pydr |
hello |
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| pydr |
does anyone have experience with apache tika? |
[05:13]
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| pydr |
i need to understand if there is a way to correctly define box boundaries |
[05:13]
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| Maldivia |
what are you trying to do? |
[05:14]
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| pydr |
Maldivia, my problem is that the extraction should follow some rule... I should do a layout analysis or something like that to understand the "sequence/order" of the blocks of text |
[05:16]
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| pydr |
because if the user creates a pdf with two columns i should extract the row sequence one after the other |
[05:17]
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| pydr |
tika often extract all the text of a column and then the other one.. |
[05:17]
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| pydr |
in many case it mess up all the next steps i need to do (i do NLP) |
[05:17]
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| Maldivia |
is there a reason you're using tika for this, and not using pdfbox directly? |
[05:17]
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| pydr |
so for me the relations of the blocks of text matter |
[05:18]
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| pydr |
Maldivia, because i need to handle different formats, doc, pdf openoffice formats etc |
[05:18]
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| pydr |
for that reason |
[05:18]
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| pydr |
what pdfbox does? |
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| Maldivia |
it's a pdf parsing lib |
[05:19]
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| pydr |
i am reading, yes ok...hmm it could works too, i mean that i can convert doc into pdf (and pray everything goes fine) |
[05:20]
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| pydr |
and then use pdfbox |
[05:20]
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| pydr |
the problem as i wrote is not the extraction (with the extraction i mean the capability to understand the format)... i mean that i must understsand the layout and then understand the related boxes |
[05:21]
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| pydr |
because if i get all the text of a column and then the other and the other again...it will mess up everything, my NER model will not understand the real context |
[05:21]
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| Maldivia |
well, that information might not be in the file unless rendered on screen/paper |
[05:21]
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| pydr |
Maldivia, so maybe is better to convert the document in an image? |
[05:22]
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| pydr |
and then work with an OCR |
[05:22]
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| Maldivia |
pydr: well, then you have OCR issues instead -- not that you can't already have that with PDF, but :D |
[05:22]
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| pydr |
Maldivia, yeah you are right but however thinking about the box boudaries i can get TEXT + position(x,y) in a document |
[05:23]
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| pydr |
so maybe an ocr is not needed |
[05:23]
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| pydr |
but i need to train a model that understand with text + position the relations |
[05:23]
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| pydr |
but seems quite difficult |
[05:23]
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| Maldivia |
pydr: but how do YOU know that those boundries are correct? |
[05:23]
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| dreamreal |
Maldivia: I was thinking about just starting a doc on github and just covering installing java... and then kinda progressing from there |
[05:23]
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| pydr |
Maldivia, good question, i can train the model with a labelled document... but yeah i should have many document to train the model well, but it could be a start |
[05:24]
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| Maldivia |
pydr: how do you recognize if it's two columns of text, or a table with left-right values? |
[05:24]
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| pydr |
visually to train the model it depends of text context and mainly on the struture of the document because i am parsing resume/Cv |
[05:25]
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| pydr |
so it is not a completely random format |
[05:25]
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| Maldivia |
ok, yeah, context is key |
[05:26]
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| pydr |
yes absolutely |
[05:26]
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| pydr |
hard task |
[05:28]
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| Maldivia |
pydr: quick example from google image search -- https://cdn-images.zety.com/images/zety/landings/examples/artist-cv-example@2x.png -- I have no idea how it would be stored in a PDF, but there are many columns here, some related to eachother, some not, some spanning multiple lines, etc |
[05:29]
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[05:31]
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| greentree47 |
is there a good data type for really large values that support decimals |
[05:31]
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| cheeser |
javadoc BigDecimal |
[05:31]
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| cheeser |
cheeser: https://bit.ly/2XRM1R0 [JDK: java.math.BigDecimal] |
[05:31]
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| Maldivia |
BigDecimal |
[05:31]
|
| greentree47 |
what about double |
[05:31]
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| dreamreal |
BigDecimal? |
[05:31]
|
| dreamreal |
depends on what "good" means for you |
[05:31]
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| greentree47 |
i was using long and then i realized i needed decimals too |
[05:31]
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| greentree47 |
but worried about like rounding errors |
[05:31]
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| dreamreal |
IEEE FP is not known for being especially accurate |
[05:32]
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| dreamreal |
if you NEED accuracy, use BigDecimal |
[05:32]
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| Maldivia |
greentree47: what is "really large", and what kind of precision do you need? |
[05:32]
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| greentree47 |
values can go into the trillions |
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[05:32]
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| pydr |
Maldivia, i need to understand what model to train, maybe a CNN |
[05:32]
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| greentree47 |
and i could probably round |
[05:33]
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| sonOfRa |
You want BigDecimal and specify a roundingmode |
[05:33]
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| sonOfRa |
That way you control the rounding, rather than the inaccuracies piling up due to float arithmetic |
[05:33]
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| Maldivia |
pydr: "what model to train" -- yeah, that's where I stop being helpful :D |
[05:33]
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| pydr |
Maldivia, :) |
[05:34]
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| pydr |
Thank you i will use that png to do some test |
[05:34]
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| greentree47 |
how do i do that stuff sonOfRa |
[05:36]
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| Maldivia |
pydr: as said, it was one of the first results from a google image search on CV -- just to show how columns may or may not be related -- usually there are some visual ques that we as human just pick up, but how to detect that in code, or train something to detect that -- no idea |
[05:36]
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| cheeser |
greentree47: read the javadoc |
[05:36]
|
| pydr |
yeah, very hard |
[05:36]
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| sonOfRa |
BigDecimal myNumber = new BigDecimal("123456789101112131415.1617181920212223") |
[05:36]
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| sonOfRa |
Such magic. |
[05:36]
|
| sonOfRa |
javadoc MathContext |
[05:37]
|
| sonOfRa |
javadoc BigDecimal |
[05:37]
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| sonOfRa |
sonOfRa: https://bit.ly/2XRM1R0 [JDK: java.math.BigDecimal] |
[05:37]
|
| sonOfRa |
sonOfRa: https://bit.ly/307WLw3 [JDK: java.math.MathContext] |
[05:37]
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| pydr |
Maldivia, or maybe i can try an heuristic way just working with the "distance" of blocks and maybe understand if there are titles or something like that |
[05:37]
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| sonOfRa |
you'll need those two, and as a tip: Don't actually round. Only do the rounding when displaying the numbers later on. |
[05:37]
|
| johnjay |
weirdly you can still download "Java SE Development Kit 8u281 Documentation" from oracle as well |
[05:37]
|
| sonOfRa |
javadoc DecimalFormat |
[05:37]
|
| sonOfRa |
sonOfRa: https://bit.ly/2SzgQVJ [JDK: java.text.DecimalFormat] |
[05:37]
|
| Maldivia |
johnjay: ofcourse you can - using oracle jdk for developement and testing is still ok |
[05:38]
|
| johnjay |
so is the jdk not maintained by oracle? |
[05:38]
|
| johnjay |
did they "open source" it and then stop making materials? |
[05:38]
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| dreamreal |
Sun open sourced it |
[05:39]
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| dreamreal |
which I'm sure oracle's resented from day one |
[05:39]
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| Maldivia |
johnjay: OpenJDK is maintained by... OpenJDK -- Oracle helps maintain OpenJDK, but they also have their own distribution of it, that they provide premium support on, that is called OpenJDK |
[05:39]
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| Maldivia |
ehh OracleJDK |
[05:40]
|
| johnjay |
why would they resent it? sun did it before they were acquired by oracle according to wiki |
[05:42]
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| johnjay |
that's like me resenting you for damaging your car that i just bought at a reduced price |
[05:42]
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| Maldivia |
johnjay: it's like you resenting me for limping my race horse as you were about to buy it |
[05:42]
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| Maldivia |
sure it's cheaper now, but it's not going to win you a lot of money in races |
[05:43]
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| dreamreal |
johnjay: They resented it because java turned out to be the jewel in teh crown of acquiring Sun |
[05:52]
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| dreamreal |
and damn it ANY old fool could use it |
[05:52]
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| dreamreal |
I mostly wish Sun hadn't ... done what steps they did to wreck themselves, I loved Sun |
[05:52]
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| ricky_clarkson |
If they hadn't have open sourced it I wonder if we'd have basically stopped using it by now out of fear of Oracle's lawyers/licencing costs. |
[05:54]
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| dreamreal |
probably |
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| johnjay |
i don't know much about what happened to sun. |
[05:58]
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| johnjay |
i did use sun solaris workstations once upon a time. they were cool. |
[05:59]
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| dreamreal |
They went bankrupt because their marketing was ass and the sharks that circled them were smarter than they were. Sun always had a much better tech stack than business plan. |
[05:59]
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| johnjay |
sad. that is the way of the world though |
[06:00]
|
| johnjay |
it is as much bravery and power and money that decide things as having the technically best or efficient tech |
[06:00]
|
| johnjay |
*cough* iphones *cough* |
[06:01]
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| dreamreal |
Oddly enough java probably helped kill sun, by making the sparc platform less relevant |
[06:01]
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| ricky_clarkson |
I had to support a Java app with a JNI component, including a build for Sparc. That was by far my slowest platform. |
[06:01]
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| dreamreal |
even though java ALSO meant that you could write an app on a pissant windows machine and run it as is on a sparc |
[06:01]
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| ricky_clarkson |
I believe the only Sparc customer we had was actually Sun at the time. :) |
[06:01]
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| dreamreal |
ricky_clarkson: Hrm. I had an E350 personally, and also had root on a E10K |
[06:02]
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| dreamreal |
The E10K was a freaking beast |
[06:02]
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| ricky_clarkson |
I have no idea what it was now, just that it was slow and noisy. This was around 2008, and I think it was already outdated by then. |
[06:02]
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| dreamreal |
I got my E350 in 2006 or so :) |
[06:03]
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| dreamreal |
I actually used it for a few years after that, I loved that thing even though it was pretty much binary compatible with nothing |
[06:04]
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| ricky_clarkson |
"Sun always had a much better tech stack than business plan" - Commodore before them too :/ |
[06:04]
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| dreamreal |
well, commodore had a *cheaper* tech stack which made up for their lack of a business plan... |
[06:05]
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| ricky_clarkson |
heh |
[06:05]
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| dreamreal |
Then the Amiga, of course, but then you're right on target: better tech stack, still amazingly terrible business plan |
[06:05]
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| dreamreal |
The fact that people still idolize the amiga *even now* says a lot about how much value they pissed away |
[06:06]
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| ricky_clarkson |
I still emulate it to compose midi files (OctaMED SoundStudio). |
[06:07]
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| dreamreal |
oof |
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| dreamreal |
that's cool, but... oof |
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| johnjay |
dreamreal: yes i do sometimes hear about the great old days of amiga |
[06:08]
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| johnjay |
i always assumed people do that out of nostalgia or just good marketing |
[06:08]
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| dreamreal |
the amiga was worldshattering for its day |
[06:08]
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| ricky_clarkson |
I even saw Java running on it, probably not technically Java but kava/kawa or something built on gij |
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| johnjay |
> I've had an Amiga for maybe a decade. It's the single most reliable piece of equipment I've ever owned. It's amazing! You can easily understand why so many fanatics are out there wondering why they are alone in their love of the thing. The Amiga continues to inspire a vibrant ? albeit cultlike ? community, not unlike that which you have with Linux, the Unix clone. |
[06:09]
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| johnjay |
--John C Dvorak |
[06:09]
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| Tabmow |
Would there be any possible reason why I get a 'The dependencies of some of the beans in the application context form a cycle only sometimes' error when deploying my application to AWS ECS, but I can't replicate it locally when I start my app seemingly with the same configuration? |
[06:12]
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| cheeser |
pull down what's deployed there and diff it. |
[06:17]
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| cheeser |
check the logs for errors |
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[06:17]
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| johnjay |
hrm the java 15 api has a different layout |
[06:19]
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| johnjay |
i kinda prefered the "one long list of everything" |
[06:19]
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| cheeser |
it started changing with 9 and modules |
[06:19]
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| cheeser |
well, it was always *changing* but, you know... |
[06:20]
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| Maldivia |
well, there was still the frames layout, until java 11 |
[06:21]
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| Maldivia |
johnjay: but now you have a search box instead |
[06:22]
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| Maldivia |
johnjay: and there is also https://docs.oracle.com/en/java/javase/15/docs/api/overview-tree.html |
[06:22]
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| Tabmow |
cheeser: it's the exact same package - only different is running it in windows locally, and linux in ECS |
[06:28]
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| Tabmow |
I did find this: This is very likely related to the order in which the class files are read in line |
[06:28]
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| Tabmow |
Since the order of file listing (class files) is dependent on the platform, and there is no sorting done on the array, the order the classes are loaded in is dependent on how the platform returns them. |
[06:28]
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| Tabmow |
dir.listFiles() in PathMatchingResourcePatternResolver.doRetrieveMatchingFiles() |
[06:28]
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| Tabmow |
Interesting... |
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| johnjay |
is it intentional that javac will not update the class file if it exists? |
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| Maldivia |
it will if you ask it to compile that source file |
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| johnjay |
i did javac test.java && java test and changing/saving things doesn't have any effect |
[06:38]
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| Maldivia |
it should |
[06:39]
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| johnjay |
ok it does change if i change the hello world to hello worldddd |
[06:39]
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| johnjay |
but not if i rename class test { to class test11 { |
[06:39]
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| Maldivia |
it will, but then you have to run java test11 |
[06:39]
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| johnjay |
i guess i'm not understanding how the class loader works |
[06:39]
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| johnjay |
oh right. cause the file still exists |
[06:40]
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| Maldivia |
java [name of class you want to run, not file] |
[06:40]
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| johnjay |
right. that makes more sense |
[06:40]
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| johnjay |
i was trying to determine what happens if you compile a file where the class is not the filename |
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| Maldivia |
if the class is a public top-level class, you'll get an error |
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| Maldivia |
for non-public, it wors |
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| Maldivia |
works* |
[06:41]
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| johnjay |
i... see |
[06:41]
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| Maldivia |
but do yourself a favor and keep filenames and classnames in sync, even for non-public classes!! |
[06:41]
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| johnjay |
right. i was trying to figure out the reason |
[06:42]
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| johnjay |
i didn't realize it mattered if it was public for that |
[06:42]
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| johnjay |
ah ok. so you can only have public class if it matches. adding another class like public class blah { gives an error |
[06:42]
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| Maldivia |
technically, you can have multiple top-level classes in the same file, but only one of them can be public |
[06:42]
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| johnjay |
yes exactly |
[06:42]
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| Maldivia |
the compiler will still compile and generate the correctly names .class files; the reason for having the names correct in source files as well, is so that javac can find the files for classes you reference |
[06:43]
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| Maldivia |
if you have Foo.java: public class Foo { public static void main(String[] args) { new Bar(); } } Other.java: class Bar {} -- if you compile Other.java first, and then compile Foo.java, it will work, but if you just try to compile Foo.java, it will fail, because it cannot find the Bar class, there is no Bar.class on disk, and no Bar.java either to compile it from |
[06:45]
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| johnjay |
ah i see it made 2 class files even though i had both classes in the same file |
[06:45]
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| Maldivia |
you get a .class file PER class in your source file (sometimes more than one) |
[06:45]
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| johnjay |
so it would seem |
[06:46]
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| johnjay |
so in that situation doing java Foo.java would implicitly compile Bar.java? |
[06:46]
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| johnjay |
er javac Foo.java? |
[06:47]
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| johnjay |
or no |
[06:47]
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| Maldivia |
in the above example, when you run javac Foo.java, the compiler needs to know what Bar is, so it will try to find it, first it will look for a Bar class on classpath (ie a Bar.class file on disk), if it fails to find it, it will then look for a source file that contains is, so it will look for a Bar.java file |
[06:48]
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| johnjay |
interesting. |
[06:49]
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| Maldivia |
so if you have a small project with say 10 classes, and all properly named source files etc, and you just compile the Main.java class, probably all 10 classes will end up being compiled |
[06:50]
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| johnjay |
ah it does do that |
[06:51]
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| johnjay |
i suppose i would learn all this if i actually looked at the openjdk source |
[06:51]
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| Maldivia |
naah |
[06:51]
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| cheeser |
or just rtfm |
[06:52]
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| dmlloyd |
you would think so, but no, that'd just confuse you a lot more |
[06:52]
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| Maldivia |
you would learn that if you read the docs |
[06:52]
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| Maldivia |
and then the next day you would forget about calling javac directly yourself, and move on to using a build system, like maven or gradle :D |
[06:52]
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| johnjay |
so far i have the original java whitepaper, the java api, and the java oracle tutorial |
[06:52]
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| johnjay |
XD |
[06:52]
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| cheeser |
you're not starting with Plato? that's an odd choice. |
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| Maldivia |
and skipping Oak as well |
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| johnjay |
Plato like the philosopher? i thougth socrates was the father of philosophy |
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| nyxyn |
Plato in spanish means plate |
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