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| plitter |
If you have a an int, and you do BigDecimal.valueOf(int).divide(BigDecimal.valueOf(100L)), that would always lead to 2 decimal digits. There isn't some edge case that I'm missing right? |
[03:29]
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| Maldivia |
100/100 ? |
[03:30]
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| plitter |
.... ok fine, are there edgecases that lead to more than 2 digits? |
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| Maldivia |
you are dividing by 100... of course not |
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| deebo |
/100 just increases the scale by two from 0 of integer scale |
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| codecutter |
have i missed anything? java -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=:5005 -jar myjar.jar |
[04:46]
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| codecutter |
zsh: no matches found: -agentlib:jdwp=transport=dt_socket,server=y,suspend=n,address=:5005 |
[04:46]
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| Maldivia |
codecutter: did you actually write java, or do you have some unquoted ; on your line? seems like your shell is the one complaining |
[04:47]
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| codecutter |
yeah, thats what i get when I run it the above args |
[04:49]
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| codecutter |
with the* |
[04:49]
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| codecutter |
no matches found... |
[04:49]
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| Maldivia |
as said, it's your shell that's complaning, not a java issue |
[04:49]
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| mbooth |
codecutter: And when you run "java -version" what happens? |
[04:50]
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| codecutter |
thats find (first thing i did) |
[04:50]
|
| codecutter |
fine* |
[04:50]
|
| codecutter |
java version "15" 2020-09-15 |
[04:50]
|
| codecutter |
Java HotSpot(TM) 64-Bit Server VM (build 15+36-1562, mixed mode, sharing) |
[04:50]
|
| codecutter |
Java(TM) SE Runtime Environment (build 15+36-1562) |
[04:50]
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| Maldivia |
codecutter: is the above your FULL command line? |
[04:52]
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| codecutter |
yes |
[04:53]
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| plitter |
what is the "* +" at the beginning of the last line. what is that called? http://ix.io/2QkE |
[04:55]
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| Maldivia |
codecutter: and you are running it directly from a logged in console? |
[04:55]
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| Maldivia |
plitter: multiply |
[04:55]
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| codecutter |
local machine |
[04:55]
|
| codecutter |
yes |
[04:55]
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| Maldivia |
plitter: and unary plus |
[04:56]
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| Maldivia |
plitter: similar to how you can write -100 -- you can also write +100, even though it's not needed |
[04:56]
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| mbooth |
codecutter: And when you run just "java -agentlib"? |
[04:56]
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| Maldivia |
it still smells of there being a & or ; on the line, or you running it via ssh or something |
[04:57]
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| plitter |
Maldivia: ok, thanks |
[04:58]
|
| codecutter |
mbooth same |
[04:58]
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| mbooth |
codecutter: Same what? zsh complain? |
[04:58]
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| codecutter |
Unrecognized option: -agentlib |
[04:58]
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| codecutter |
Error: Could not create the Java Virtual Machine. |
[04:58]
|
| codecutter |
Error: A fatal exception has occurred. Program will exit. |
[04:58]
|
| codecutter |
slight diff response |
[04:59]
|
| codecutter |
slightly* |
[04:59]
|
| codecutter |
hmm |
[04:59]
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| Maldivia |
yeah, this is because now it's a JVM error, not a shell error |
[04:59]
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| mbooth |
codecutter: So that works correctly then. There's something fishy with your initial command, re-type it again (i.e. don't resuse the command from your shells history) |
[04:59]
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| codecutter |
i'm copying it driectly from here https://www.baeldung.com/intellij-remote-debugging |
[05:00]
|
| codecutter |
codecutter's title: "Remote Debugging with IntelliJ IDEA | Baeldung" |
[05:00]
|
| Maldivia |
codecutter: add quotes around your args -- your shell is fucking you up |
[05:00]
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| Maldivia |
codecutter: learn to use your shell |
[05:00]
|
| codecutter |
ah |
[05:01]
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| Maldivia |
codecutter: it's a zsh "feature" |
[05:02]
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| codecutter |
pretty shitty feature to be honest! |
[05:02]
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| Maldivia |
unsetopt nomatch |
[05:02]
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| mbooth |
Maldivia: It's the ghost. As in the "Ghost in Zee Shell" |
[05:02]
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| Maldivia |
consider putting that in your .zshrc |
[05:02]
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| mbooth |
Consider an exorcism |
[05:03]
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| Shell |
mbooth: :| |
[05:12]
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| mbooth |
Shell: Consider exorcising your daemons! (Not to be confused with exercising your demons ;-) |
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| awmv |
Is this Laptop sufficient for developing? https://www.digitec.ch/en/s1/product/hp-elitebook-850-g7-177f2ea-1560-4k-intel-core-i7-10710u-32gb-1000gb-notebook-13494346?tagIds=614 |
[05:26]
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| Maldivia |
Yes |
[05:26]
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| Maldivia |
next |
[05:26]
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| Maldivia |
Another satisfied customer. Next! |
[05:26]
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[05:33]
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| Rashad |
Hello. In Java, USAPresident or UsaPresident? |
[05:33]
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| awmv |
Thank you for your service |
[05:34]
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| yawkat |
naming |
[05:34]
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| yawkat |
conventions is "ThisIsAClassName, thisIsAVariableOrMethodName, THIS_IS_A_CONSTANT_NAME, here.is.a.packagename". To camelcase an acronym, do DvdPlayer, not DVDPlayer. Also see https://google.github.io/styleguide/javaguide.html and https://github.com/google/google-java-format |
[05:34]
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| mbooth |
Rashad: Usually, UsaPresident, but IMO it's more important to be consistent. |
[05:34]
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| yawkat |
Imo* |
[05:35]
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| Maldivia |
yawkat: IYO... not IMO |
[05:36]
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| mbooth |
yawkat: Touché |
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| tolarz |
I got a variable v of type Foo, but I know that actually v is of type Bar (inheriting Foo) |
[06:10]
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| tolarz |
Bar declares a method 'start' |
[06:10]
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| tolarz |
How can I call start on v? |
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| Maldivia |
cast it |
[06:11]
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| Maldivia |
cast |
[06:11]
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| Maldivia |
Maldivia, casting is a way of changing the type of a reference (it NEVER changes an object), or a way of converting between different primitive types. '(Type) expression' casts the result of expression to Type. |
[06:11]
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| tolarz |
I don't have access to Bar |
[06:11]
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| Maldivia |
reflection |
[06:11]
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| Maldivia |
Maldivia, reflection is a set of APIs that allow programs to interrogate classes for field and method information. See http://download.oracle.com/javase/tutorial/reflect/index.html |
[06:11]
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| Maldivia |
tolarz: well, if you don't have access to Bar, then that should be a hint that you probably shoudln't have access to start() either |
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| tolarz |
ik, the design is broken |
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| Maldivia |
is Bar on your control |
[06:12]
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| Maldivia |
under your control? |
[06:12]
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| tolarz |
so "v.getClass.getMethod()" throws MethodNotFound |
[06:12]
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| tolarz |
yes, Bar is under my control |
[06:12]
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| Maldivia |
well, |
[06:12]
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| Maldivia |
add a Startable interface to it or something that you also have access to in the other place, cast to Startable and call start |
[06:13]
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| Maldivia |
tolarz: https://www.ideone.com/yKssQO |
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| tolarz |
hm |
[06:41]
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| tolarz |
somewhat related: |
[06:41]
|
| tolarz |
oh nvm |
[06:41]
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| tolarz |
How can I get a static field of a Java Class[_]? |
[06:46]
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| tolarz |
cls.getField("MODULE$").get(obj) expects this obj parameter I don't know what to pass to |
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| tolarz |
ah just null? |
[06:47]
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| Maldivia |
tolarz: why would you? |
[06:47]
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| tolarz |
i am interfacing scala and java |
[06:48]
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| Maldivia |
ahh yes, for statuc fields and methods, target object is null |
[06:48]
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| Maldivia |
tolarz: also, do remember that getField/getMethod ONLY looks at public members, and in the hierarchy aswell |
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| trcc |
Anyone familiar with good supported numerical ode packages? apache commons math is not so good for stiff-problems. I came across https://github.com/fons/JavaOdeInt which seems good, but lacking in support. |
[06:57]
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| trcc |
trcc's title: "GitHub - fons/JavaOdeInt: JavaOdeInt : Java Interface to Fortran ODE sources (odepack,quadlib,etc.)" |
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| hotcoffee |
\bl |
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| dreamreal |
morning |
[07:59]
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| pepa |
need assistance with this error please pastebin.com/W0paTsEf |
[08:06]
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[08:06]
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| Maldivia |
pepa: is userRoles a ManyToMany? |
[08:11]
|
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[08:12]
|
| pepa |
Maldivia: onetomany |
[08:12]
|
| pepa |
one user has many userRoles |
[08:14]
|
| Maldivia |
did you join it in your criteria ? |
[08:15]
|
| pepa |
the criteria is of class UserListPaginatedGridCriteria.... which has a pagination object of type PaginatedGridCriteria...which has a Filter object.... which has a list of Filter..... |
[08:20]
|
| pepa |
one of the properties of that filter is the one I need to use for the filtering |
[08:21]
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| pepa |
need assistance with this error please pastebin.com/W0paTsEf |
[08:37]
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| dreamreal |
wina |
[08:45]
|
| dreamreal |
pepa, Why is no one answering? 1) They don't know. 2) They don't care. 3) They're too busy. Constantly repeating your question won't help. If someone knows, maybe they'll answer. In the meantime, you should consult your search engine of choice. |
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[10:33]
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| Maldivia |
wait what... [mind blown emoji] https://download.java.net/java/early_access/jdk17/docs/api/java.base/java/util/HexFormat.html -- Java will finally get a class for formatting and parsing strings of hex digits! |
[10:39]
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| Maldivia |
Maldivia's title: "HexFormat (Java SE 17 & JDK 17 [build 10])" |
[10:39]
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| cheeser |
BLOAT! |
[10:40]
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[10:49]
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| pepa |
can someone give me a hint on this error? pastebin.com/1VKksgJc |
[10:49]
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| cheeser |
looks like you have a null in there. |
[10:51]
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| pepa |
it's not null |
[10:51]
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[10:51]
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| Maldivia |
pepa: I already asked you if you are remmebering to join your userRoles in your query, because if you don't, it will be null |
[10:52]
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| cheeser |
oh, i guess, whatever that is just added null in that path for no reason then. my mistake. |
[10:52]
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| Maldivia |
but you didn't answer the question |
[10:52]
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| dreamreal |
well, something thinks it is |
[10:52]
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| pepa |
Maldivia: the join is done in the entity.... that is done.... anywhere else I might have to do the join? |
[10:53]
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| Maldivia |
pepa: are you doing the join in your criteria query, if not, you get null |
[10:53]
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| pepa |
I think this method listUsersByCriteria is actually building the query |
[10:55]
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[10:55]
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| Maldivia |
well, then fix that method |
[10:55]
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| pepa |
but the line 12 is actually throwing the exception |
[10:55]
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| cheeser |
so fix *that* code |
[10:56]
|
| pepa |
how |
[10:57]
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| pepa |
I know I have to fix the code |
[10:57]
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| cheeser |
i would expect that criteria busted like Maldivia has been saying. |
[10:58]
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| cheeser |
i'm not a JPA guy though so |
[10:58]
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| cheeser |
¯\_(?)_/¯ |
[10:58]
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| dreamreal |
criteria queries involve lots of black magic; you're better off avoiding them, usually, unless you really know what you're doing. I'd ask yawkat for help with them, in ##java, but that assumes yawkat is around and you're willing to be nice to him in the process. |
[10:59]
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| pepa |
black magic and for that I need the kat? is it a black kat? |
[11:02]
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| dreamreal |
or you could do that and piss away people wanting to help you |
[11:02]
|
| dreamreal shrugs |
[11:02]
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| pepa |
-D just joking |
[11:03]
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| cheeser |
less "joking" more thinking |
[11:03]
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| pepa |
uufff |
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[11:11]
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| pepa |
it never really finishes building the query |
[11:12]
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| pepa |
it gets the exception in the middle |
[11:12]
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| pepa |
I guess it sees the user as null |
[11:12]
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| pepa |
but when I debug it, it shows a user |
[11:13]
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| Maldivia wonders if he should repeat himself for the 3rd time |
[11:13]
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| mbooth increases Maldivia's volume |
[11:13]
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| pepa |
yeah I know "fix the code" |
[11:13]
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| pepa |
"fix the error" |
[11:13]
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[11:17]
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| Maldivia |
Uhh, this seems interesting |
[11:20]
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| Maldivia |
jep 8261007 |
[11:20]
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| Maldivia |
'JEP draft: Frozen Arrays (Preview)' can be found at http://openjdk.java.net/jeps/8261007 |
[11:20]
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| dreamreal |
pepa: you do realize maldivia asked you a question that has an answer |
[11:21]
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| dreamreal |
but you didn't answer it |
[11:21]
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| dreamreal |
maybe you don |
[11:21]
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| dreamreal |
maybe you don't, maybe you SHOULD realize it |
[11:21]
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| dreamreal |
but hey, you do you |
[11:21]
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| pepa |
which question, maybe my internet got cut |
[11:21]
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| dreamreal |
Maldivia | pepa: I already asked you if you are remmebering to join your userRoles in your query, because if you don't, it will be null |
[11:22]
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| dreamreal |
logs |
[11:22]
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| dreamreal |
pepa, channel logs can be found at http://javabot.evanchooly.com/ (Select the channel from the list on the left-hand side.) |
[11:22]
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| pepa |
yeah but that's a very vague comment |
[11:22]
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| pepa |
he's not saying how I could do that |
[11:22]
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| dreamreal |
he's asking a que... |
[11:23]
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| _lucifer |
? |
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| svm_invictvs |
Okay, this is a bizarre one ... I get a ClassCastException in my code ... which doesn't make any sense ... |
[02:04]
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| svm_invictvs |
https://gist.github.com/ptwohig/2a88108540eb17dd1ad4080b150e09f7 |
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[02:06]
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| svm_invictvs |
Would screwing up my hashCode/Equals in InstanceHostInfo cause that? |
[02:07]
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| cheeser |
does your stack trance end in hashCode/equals? |
[02:07]
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| svm_invictvs |
No |
[02:08]
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| cheeser |
then probably not |
[02:08]
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[02:08]
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| svm_invictvs |
cheeser, It's deep in the streams API |
[02:09]
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| svm_invictvs |
cheeser, It's in one of my predicates above. |
[02:09]
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| svm_invictvs |
cheeser, Rather, it doesn't make it to my code. Somehow it's trying to pass a string to a predicate and that causes the issue. I think. |
[02:13]
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| svm_invictvs |
I dunno |
[02:13]
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| svm_invictvs |
ReferencePIpeline.filter |
[02:13]
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[02:13]
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| yawkat |
the error cannot happen in the stdlib, because the stdlib does not reference InstanceHostInfo |
[02:14]
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| yawkat |
show the full stack trace |
[02:14]
|
| yawkat |
(it could happen in the lambda) |
[02:14]
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| svm_invictvs |
It's not happening in the lambda. It' shappening as the stdlib calls the lambda. |
[02:17]
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| yawkat |
show the full stack trace |
[02:17]
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[02:18]
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| svm_invictvs |
yawkat, One sec. I will. But I have it caught red-handed on a breakpoint. I dont' want to lose that lol |
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[02:36]
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| Joel |
devooops guy here. search terms I'm using aren't hitting. java app running in tomcat, is it possible to performance profile a running app? I would love a great article or two to read, or good search terms I can use to educate myself some more |
[02:38]
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| Perform parted the channel: |
[02:38]
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| _lucifer |
jfr |
[02:39]
|
| _lucifer |
Java Flight Recorder (JFR) is a tool for collecting diagnostic and profiling data about a running Java application: https://docs.oracle.com/javacomponents/jmc-5-4/jfr-runtime-guide/toc.htm |
[02:39]
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| Joel |
_lucifer thanks! |
[02:39]
|
| tang^ |
I got a bunch of nice hits from "tomcat profile performance" |
[02:39]
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| ernimril |
Joel, just starting jvisualvm can also give some insights, but be careful about actually profiling with it, it can affect performance a lot |
[02:40]
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| Joel |
tang^ thanks, will try that as well. |
[02:40]
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| Joel |
ernimril yes, I've always had a keen sense profiling will have a big hit. The JFR looks like it won't, but it sounds like it's also a for pay thing. |
[02:40]
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| ernimril |
Joel, what problems are you looking for? cpu usage? memory usage? network load? ...? |
[02:40]
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| tang^ |
Joel: jfr used to be for pay |
[02:41]
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| _lucifer |
its still for pay for use in production iirc |
[02:41]
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| Joel |
ernimril just trying to get a handle where an app is spending most of it's time, so I can better tune systems to support. |
[02:42]
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| Joel |
if I can pick out inefficient bits of code, and suggest improvements, that would be great too. |
[02:42]
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| ernimril |
Joel, unless you are a great developer that knows a lot about the applications that is quite unlikely. Most normal developers can not profile and figure out what is happening. Normally you need to know the data structures and algorithms in question to actually be able to interpret the results |
[02:44]
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| ernimril |
Joel, now, I fully support you, we need more devops that knows stuff, but try to keep it realistic :-) |
[02:44]
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| svm_invictvs |
yawkat, Well shit. It was a combination of generics abuse and bad conversions in my DI Container. A Set<InstanceHostInfo> was actually populated as a Set<String> |
[02:45]
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| cheeser |
svm_invictvs: i figured as such |
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[02:46]
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| Joel |
ernimril I once knocked 4 hours off a 12 hour run time of a ruby app, run through jruby, by changing checking if a hash key was 1, to just checking if the hash key was existed. csv file, done for every cell, on a 1TB file. |
[02:47]
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| Mrbuck |
Hi I saw some professor dislike jetbrains idea and at the same time even in oracle page they mentioned eclipse,netbeans even some bluej but not jetbrans idea why? Where as idea is famous within IRC and other place |
[02:47]
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| Joel |
I think I'll be fine. |
[02:47]
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| cheeser |
Mrbuck: not really a question for here. |
[02:48]
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| Mrbuck |
cheeser: any other place where I can discuss this? i want to know if java communitythink any problems/bad practises using idea..I forgot and lost the video of that profesoor ehere he mentioned something |
[02:51]
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| svm_invictvs |
cheeser, Yeah, it was just a really convoluted set of steps to find it lol. |
[02:51]
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[02:51]
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| yawkat |
Mrbuck: nothing wrong with using idea... but it's really not an interesting discussion |
[02:52]
|
| Mrbuck |
ok |
[02:52]
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| dreamreal |
Mrbuck: probably because IDEA was a commercial product for a while |
[02:52]
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| dreamreal |
now it has a community/free edition so the objections are stupid |
[02:52]
|
| Mrbuck |
dreamreal: ok |
[02:52]
|
| dreamreal |
"how dare they want to make money from a kickass product" is typical |
[02:53]
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| Mrbuck |
dreamreal: I searched and found that professor says with inteelij that there are some extra annotations that added which is not the code beng developed but type of methodsor parameters in functions and so on" he claims good programmer doesn't need them. I am new to java and Ide so I ask it here |
[03:03]
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[03:03]
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| dreamreal |
the prof is practicing onanism |
[03:03]
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[03:05]
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| cheeser |
again, not here. |
[03:06]
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| dreamreal |
practicing onanism here would be gross |
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| svm_invictvs |
dreamreal, We don't like intellij now? |
[04:57]
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| Diablo-D3 |
boo! |
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[08:20]
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| Maldivia |
https://twitter.com/chriskalmar/status/1363759778858729482?s=19 |
[08:27]
|
| Maldivia |
Maldivia's title: "Chris Kalmar ? TypeScript on Twitter: "Serious productivity boost for reading code on GitHub.
1??.
Go to any repo you are interested in on GitHub.
2??.
Replace "github" with "github1s" (one + s) in the browser address bar.
3??.
Enjoy ..." |
[08:27]
|
| Maldivia |
this is very cool |
[08:27]
|
| Maldivia |
example: https://github1s.com/openjdk/jdk |
[08:29]
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[09:07]
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| cheeser |
Maldivia++ |
[09:16]
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| cheeser |
maldivia has a karma level of 318, cheeser |
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| newpy |
I am using "%-20d" to format strings for each row, but positive numbers to be shifted one space to the right (so the numbers line up and negative signs stick out a bit) |
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| newpy |
is this doable? (obviously don't want to write a whole function, this is just a slight ocd tick) |
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| db |
uhm. how about %-21d ? |
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| db |
no wait let me try this ;) |
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| db |
newpy: I think what you're looking for is just %20d . |
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| db |
that would right-alight the numbers |
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| newpy |
db, oh that's right haha |
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| db |
the - left-aligns them, it's not about the sign |
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| db |
ok |
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| newpy |
yes I knew - left aligns, just didn't consider I could just right align |
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| db |
ok |
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| newpy |
I thought that would create a "jagged" border on the left, but all the #'s are the same length |
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| newpy |
can anyone tell me why the first println shows but the second one doesn't? https://paste.ee/p/v23bf |
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| newpy |
newpy's title: "Paste.ee - View paste v23bf" |
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| newpy |
hmm, actually when I put that pastee in onlinegdb the second line does print, must be something afterwards messing with it |
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