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| r3m1 |
hello |
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| pepa |
anybody used criteriabuilder for making queries? |
[05:07]
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| mbooth |
anybody |
[05:08]
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| mbooth |
pepa, I'm sure somebody does, somewhere. But, if you've got a question, ask it anyway. |
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| qqqhhh |
hello in JDK16 records will be released, are the records a correct use case for storing objects with large number of fields (around 50) ? thanks. the syntax is that every component should be declared on one line. |
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| Maldivia |
qqqhhh: records are immutable data classes -- if your type with the 50 fields is such, then sure |
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| qqqhhh |
Maldivia: thanks |
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| mbooth |
qqqhhh: The correct use case is "I need a immutable holder for data" -- number of fields is largely irrelevant |
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| Maldivia |
public record Foo(int x, int y) {} is equivalent to public class Foo { private final int x; private final int y; public Foo(int x, int y) { this.x = x; this.y = y; } /*toString,equals,hashCode,accessorMethods*/ } |
[06:02]
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| mbooth |
Maldivia: Isn't it equiv to public *final* class Foo? |
[06:03]
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| Maldivia |
yes |
[06:03]
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| Maldivia |
was too lazy to correct myself :D |
[06:03]
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| mbooth |
-) |
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| qqqhhh |
Maldivia: if i have 50 fields will the declaration line be too long? i will have to newline after each field to make it readable |
[06:03]
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| Maldivia |
qqqhhh: you can break it up as well |
[06:04]
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| Maldivia |
public record Foo( |
[06:04]
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| Maldivia |
int x, |
[06:04]
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| qqqhhh |
yes that was what i meant |
[06:05]
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| qqqhhh |
will it be then possible to assemble records from json without going manually through all fields? |
[06:06]
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| qqqhhh |
the second question is not related to the first |
[06:06]
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| mbooth |
qqqhhh: A record is just a fancy pojo, how do you currently do it?? |
[06:06]
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| Maldivia |
jackson probably has support for that already |
[06:07]
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| qqqhhh |
mbooth: currently gson |
[06:07]
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| Maldivia |
jackson 2.12 support records |
[06:07]
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| Maldivia |
gson doesn't yet support records |
[06:08]
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| Maldivia |
without a handrolled deserializer |
[06:08]
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| qqqhhh |
Maldivia: interesting thanks |
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| qqqhhh |
Maldivia: probably they are planning to support it would presume |
[06:09]
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| Maldivia |
there's an open ticket about it, yes |
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| nb-ben |
qqqhhh: if you have 50 fields in one type, it's likely you're joining a few types together, or you've exploded something that should be an array |
[06:11]
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| Maldivia |
nb-ben: naah, sometimes json objects are just that big |
[06:11]
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| nb-ben |
(by array I mean List, Map, etc) |
[06:11]
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| nb-ben |
I can theoretically accept this, though I doubt I'd ever witness something where I couldn't detect exploded types |
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| nb-ben |
or an exploded collection |
[06:12]
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| mbooth |
Absolute unit of a json object. |
[06:12]
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| nb-ben |
I suppose if you're supporting somebody else's API you wouldn't have much to do about this |
[06:13]
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| guacjack |
Hey all, what is the most commonly DateTimeFormatter to use when returning a stringified version of a date in say JSON? I was going to go with ISO_OFFSET_DATE_TIME |
[06:13]
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| Maldivia |
nb-ben: example with 36 fields: https://github.com/Sonarr/Sonarr/wiki/Series#returns-jsonarray |
[06:13]
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| Maldivia |
Maldivia's title: "Series · Sonarr/Sonarr Wiki · GitHub" |
[06:13]
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| qqqhhh |
nb-ben: currently the biggest class is 37 fields and do not repeat meaning |
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| Maldivia |
guacjack: ISO_INSTANT |
[06:14]
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| guacjack |
Maldivia whats the reasoning for using that over ISO_OFFSET_DATE_TIME ? |
[06:14]
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| guacjack |
Im currently doing DateTimeFormatter.ISO_OFFSET_DATE_TIME.format(ZonedDateTime.now(ZoneOffset.UTC)) |
[06:15]
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| Maldivia |
guacjack: well, it really depends if you need to have the timezone info as part of the string or not ? |
[06:15]
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| guacjack |
It will always be in UTC |
[06:15]
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| Maldivia |
guacjack: if you are doing the above, then yeah, Instant.now().toString |
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| nb-ben |
Maldivia: that example can definitely be broken down |
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| nb-ben |
Maldivia: all of the ids can be combined into externalIds list, where each item has an ID type and the id itself for instance |
[06:16]
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| Maldivia |
nb-ben: sure it can, but you are not always in control of external APIs and can make that decision |
[06:16]
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| nb-ben |
Maldivia: network information along with persistence and rating can be also made into a type |
[06:16]
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| nb-ben |
yes, that I agree with |
[06:16]
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| kappa1 |
hi! I am getting "java.lang.NullPointerException: element cannot be mapped to a null key" here: data.stream().flatMap(Collection::stream).collect(groupingByConcurrent(Data::getValue, summingLong(Data::getCount))); |
[06:18]
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| Maldivia |
guacjack: the two formats are very similar, but if you're anyway going to use UTC, go with ISO_INSTANT, it already has UTC there (the Z at the end) |
[06:18]
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| nb-ben |
kappa1: one of the Data items has a null result from getValue |
[06:18]
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| kappa1 |
why the key can't be null if maps can have one null key |
[06:18]
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| Maldivia |
kappa1: Data.getValue returns null for one of your elements |
[06:18]
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| qqqhhh |
nb-ben: i could break it down too, but i think more parts would reduce readability |
[06:18]
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| pepa |
I posted the question in stackoverflow.... https://stackoverflow.com/questions/66349029/how-do-i-solve-this-hibernate-jpa-query |
[06:19]
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| kappa1 |
Maldivia, nb-ben yes, I want it to work with null keys |
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| Maldivia |
kappa1: concurrent hash map does not support null keys |
[06:19]
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| Maldivia |
kappa1: null keys is a giant smell also |
[06:20]
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| nb-ben |
^ |
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| kappa1 |
I see so perhaps I will use salting to fix that. |
[06:20]
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| Maldivia |
kappa1: that HashMap supports null keys is a fluke, most mp implementations doesn't |
[06:20]
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| Maldivia |
neither of TreeMap, ConcurrentHashMap, Hashtable supports null keys |
[06:21]
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| Maldivia |
also, the immutable maps (Map.of(k,v)) doesn't support null keys either |
[06:22]
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| nb-ben |
you should also avoid null to signal something other than that something isn't there or not found or doesn't exist |
[06:22]
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| nb-ben |
which might be why you're in this position now |
[06:23]
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| guacjack |
Maldivia thank you for your response. Im always going to UTC so will use that. So will Instant.now().toString do the same? |
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| Maldivia |
GingerGeek: Instant.now.toString() is equivalent to DateTimeFormatter.ISO_INSTANT.format(Instant.now()); |
[06:23]
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| Maldivia |
guacjack: ^ |
[06:24]
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| Maldivia |
javadoc Instant.toString() |
[06:24]
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| Maldivia |
Maldivia: https://bit.ly/2NQpLp7 [JDK: java.time.Instant#toString()]; https://bit.ly/2Wkiz6t [JDK: java.lang.Object#toString()]; https://bit.ly/2Wkiz6t [JDK: java.lang.Object#toString()] |
[06:24]
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| guacjack |
Thank you so much for the help |
[06:24]
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| kappa1 |
thanks for your help guys |
[06:25]
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| Maldivia |
guacjack: though it might be better for code readability to explicitly call the ISO_INSTANT.format() |
[06:25]
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| guacjack |
Any benefit to DateTimeFormatter.ISO_INSTANT.format(Instant.now()) over using DateTimeFormatter.ISO_INSTANT.format(ZonedDateTime.now()) ? |
[06:26]
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| Maldivia |
guacjack: ISO_INSTANT expects an Instant, so :D |
[06:27]
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| guacjack |
Ah it works with both |
[06:31]
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| Maldivia |
sure, because ZoneDateTime is basically an Instant+ZoneId |
[06:32]
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| guacjack |
I've gone with DateTimeFormatter.ISO_INSTANT.format(Instant.now()) |
[06:32]
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| guacjack |
thank you very much for your help |
[06:32]
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| yawkat |
with freemarker TemplateDirectiveModel, is there a way to escape text you write to env.out? |
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| g00s |
if i have a tight loop, does calling a method cause any performance / GC issues like allocating a lambda on each invocation |
[07:42]
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| yawkat |
sometimes, sometimes not |
[07:42]
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| yawkat |
go forth and profile |
[07:42]
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| pepa |
yawkat: they told me you are the jpa expert :-D can you please look at this question see if it sounds familiar? https://stackoverflow.com/questions/66349029/how-do-i-solve-this-hibernate-jpa-query |
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| sonOfRa |
pepa: are you resorting to just randomly highlighting people because noone is answering your questions? You already have little social capital here, and this is a *real* good way to burn what remains of it |
[07:49]
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| pepa |
I was told to ask him my question about jpa |
[07:49]
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| pepa |
I mean if he wants to answer |
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| SuperTyp |
hi all |
[08:19]
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| SuperTyp |
I am having two security configs and one of them should use the BCryptPasswordEncoder, but this breaks the other config, is there a way to inject this not as a bean so that only config A is using it? |
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[09:02]
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| yottabyte |
question about the RabbitListener annotation: if you have concurrency set to something more than 1, is each message consumed in its own thread? so if I set some property, only that thread will have access to it? |
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| dreamreal |
morning |
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| CustosLimen |
hi, I am reading some data from YAML/JSON with jackson and I want to post-process it, but I need all the data to be present before post-processing |
[09:24]
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| CustosLimen |
what is the best approach for this? |
[09:24]
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| Maldivia |
CustosLimen, so deserialize to an object, process and store in another object? |
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| CustosLimen |
Something like that, more like deserialize an object "tree", and then convert it to another object tree |
[09:25]
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| CustosLimen |
but yes |
[09:25]
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| CustosLimen |
I guess I can just do it by hand |
[09:25]
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| CustosLimen |
just wondering if there is some standard approach to doing it |
[09:26]
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| Maldivia |
what you're trying to do sounds very custom |
[09:26]
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| mitch0 |
there's MapStruct and DozerMapper and stuff like that. not sure it's worth it though |
[09:26]
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| Maldivia |
but yeah, bean mapping with converters in place |
[09:26]
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| CustosLimen |
MapStruct looks helpful |
[09:30]
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| mitch0 |
not sure it's easier than writing the mapping by hand... ymmv |
[09:30]
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| CustosLimen |
yeah, not sure either :), but I will see |
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| cheeser |
deserialize to a Map. process. then deserialize the Map to your objects. |
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| guacjack |
CustosLimen i think i would deserialise it, perform any validation on there or whatever and then create your new object from that validated object |
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| muhaha |
guys? is possible to generate codecoverage from junit ? i need cobertura format, or should use jacoco? or junit ( junit tests ) and jacoco for codecoverage? thanks |
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| muhaha |
gradle6 |
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| cheeser |
yes, it's possible. |
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| mbooth |
jacoco |
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| mbooth |
mbooth, jacoco is a free code coverage library for java from the eclemma team. See http://www.eclemma.org/jacoco/index.html |
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| mbooth |
Isn't cobertura dead or moribund? |
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| mbooth |
cobertura |
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| mbooth |
mbooth, what does that even *mean*? |
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| muhaha |
gitlab needs cobertura format as input for its codecoverage widged |
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| mbooth |
Then use cobertura |
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| mbooth |
Jacoco may even support cobertura formats though, I just read it was originally designed to supercede both emma and cobertura |
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| muhaha |
Not sure how to export it as cobertura format.. |
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| muhaha |
I am using this https://docs.gitlab.com/ee/user/project/merge_requests/test_coverage_visualization.html#gradle-example |
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| muhaha |
Not sure where is sourcecode for that python script tho |
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| muhaha |
Nope https://github.com/jacoco/jacoco/issues/1114 |
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| muhaha |
muhaha's title: "Feature: Support Cobertura output format for coverage · Issue #1114 · jacoco/jacoco · GitHub" |
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| postbloc |
I'm using JNI to create a JVM from C++, what's the best way to get System.out output from the JVM to appear in the host console? |
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| cheeser |
i've literally never used JNI so i have no idea. |
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| postbloc |
I think I'll need to call System.setOut at some point but I don't know what to pass it |
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| leotaku |
Heyo, I always hear that one thing that sets Java apart from other programming languages is the amazing IDE and automatic refactoring support. Now I have never worked on a real-world Java project so would one of you guys maybe be interested in telling me about the best/most impressive Java+IDE feature which is not possible with other languages? Thanks! |
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| postbloc |
leotaku here's an in-depth example in IntelliJ showing multiple refactorings https://www.jetbrains.com/help/idea/replace-conditional-logic-with-strategy-pattern.html I dunno about "not possible" in other languages... |
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| leotaku |
postbloc: Thanks. I think it's fair to say that this level of automatic refactoring is not currently possible with most other languages, is it not? |
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| [[1g01wk]] |
hi, i wonder, why cpu utilisation reported by visualvm could be different from cpu utilisation reported by top? |
[04:06]
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| [[1g01wk]] |
We've an app that says 80% utilisation in top but when we connect using jconsole or jfr it never above 20 |
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| leotaku |
Maybe just all core vs single core utilization? 20*4=80, so this would make sense if you are using a 4 core machine. |
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| leotaku |
[[1g01wk]] ^ |
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| ricky_clarkson |
leotaku: Most other typed mainstream langs are comparable in terms of refactoring. |
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| ricky_clarkson |
Maybe Java is a bit more polished than most, but not massively. |
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| [[1g01wk]] |
yes this might make sense |
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| whoever |
hi all |
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| whoever |
is one better than another ? gradle /maven |
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| dreamreal |
yes |
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| whoever |
and what would you say |
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| whoever |
I was getting ready to start with gradle , am I wrong |
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| dreamreal |
It depends on what your build needs to do. |
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| whoever |
pull /build dependancies |
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| dreamreal |
If it's a trivial build, well, gradle has a smoother on-ramp: apply the java plugin, add dependencies, it's pretty easy to do. But gradle shines when your build is generally flat and trivial; when you start adding plugins, well, gradle can get hairy REALLY quickly. |
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| dreamreal |
IN GENERAL I'd go maven before gradle; it's more verbose but also more consistent. |
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| dreamreal |
And if your build needs imperative processes - which isn't the case from what you're describing - gradle's the way to go. |
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| whoever |
ok, with eclipse do i need any plugins or is it all standalone installs |
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| dreamreal |
I think m2eclipse is standard, not sure about gradle, not an eclipse user |
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| whoever |
dreamreal: thank you for the help |
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| dreamreal |
no problem |
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| whoever |
dreamreal: i assume this would be a standard question, does it mapper under what tag dependancies go or just any where in the project tag |
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| dreamreal |
whoever: you mean is the build file ORDERED? I think not |
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| whoever |
Is depencies a valid element in the pom.xml , I thought it was |
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| dreamreal |
dependencies, yes |
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| dreamreal |
you DO have to spell it properly |
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| whoever |
dependencies invalid element name |
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| dreamreal |
show us |
[06:34]
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| dreamreal |
Paste the code (and any errors) in a pastebin where we can see it. See ~pastebin for options. Also see ~testcase for good examples as to how to help us help you quickly diagnose and solve problems. |
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| whoever |
https://bpa.st/OL6TQ |
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| dreamreal |
note that you have dependencies IN the build node, and that's not where it goes |
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| dreamreal |
move lines 18-24 to after </build> or before <build> |
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| whoever |
ok, so depenciencies go outside of build |
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| dreamreal |
yes |
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| whoever |
thanks again is there a good dependencies site get get all the dep markup at |
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| dreamreal |
mvnrepository.com |
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| dreamreal |
it'll even give you copy/paste content for the dependency |
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| dreamreal |
later |
[06:42]
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| whoever |
is that site also accessable from the plugin you listed earler |
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| tang^ |
it's easier to do it manually with that sight and raw xml than to let Eclipse handle it for you |
[07:03]
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| whoever |
tang^: ya, buut, this way save a whole 2 seconds |
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| tang^ |
all I know is I have to keep removing the m2e stuff from my maven projects when I work on them |
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| whoever |
well, don't let it auto resolve depencies for you |
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| cheeser |
i use search.maven.org for all that. |
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| gambl0re |
hello? |
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| cheeser |
hello |
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| cheeser |
gambl0re, https://media.giphy.com/media/Y8ocCgwtdj29O/giphy.gif |
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| gambl0re |
is this channel still active? |
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| cheeser |
do you have an actual question? |
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