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https://issues.apache.org/jira/browse/NETBEANS-2291?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16799496#comment-16799496
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Shevek commented on NETBEANS-2291:
----------------------------------
NetBeans 11 on Azul Zulu 12 threw a number of exceptions in the
settings-migration, and then it couldn't load my (Gradle) project because it
can't distinguish between the JDK NB itself is running under and the JDK the
project needs to be compiled with, it's trying to run gradle with JDK11, and
that's failing badly, and because it can't load gradle, I can't open enough
project properties to change it, and the dialogue is apparently present
individually on every submodule - do I have to change them each individually? I
have 158 submodules in this project.
Running NetBeans 11 with JDK8 seems to load, but complains about unresolved
dependencies on every subproject which uses a particular gradle plugin. It asks
me to click "Resolve Project Problems", but there is no such menu. It is
apparently unable to see build-time gradle plugins which are in mavenLocal()
(which IS listed in buildscript.repositories in build.gradle). Also, it's
throwing a lot of NPEs in the logs. And when I exit it, it thinks
org.netbeans.samples.ClassA is modified, but I've never heard of that class
except in an exception message in the netbeans log.
I think I'd rather focus on NetBeans 10 for now, as I can make day-job progress
with that.
> NetBeans is unusably slow
> -------------------------
>
> Key: NETBEANS-2291
> URL: https://issues.apache.org/jira/browse/NETBEANS-2291
> Project: NetBeans
> Issue Type: Bug
> Affects Versions: 8.2, 10.0
> Environment: Ubuntu 18.10
> Linux 4.18.0
> 12 core Xeon E-2176M with 64Gb RAM
> -Xmx2536m (2.5Gb for NB, of which it uses about 1.7G)
> NetBeans 10vc2, 10vc5, 8.2
> JDK 11.0.1
> JDK 1.8
> G1GC, CMS GC, Serial GC
> Reporter: Shevek
> Priority: Critical
> Labels: performance, usability
> Attachments: netbeans-10vc5-jdk8-hang-gototype.txt.tdump,
> netbeans-10vc5-jdk8-hang-progressutils.txt.tdump,
> netbeans-10vc5-jdk8-hang.txt.tdump, open-file-slow-01.txt.tdump,
> open-file-slow-02.txt.tdump, open-file-slow-03.txt.tdump, slow-stack-00.txt
>
>
> I used to use NetBeans 8 on JDK8, it was tolerable, but slow.
> Now I have a new laptop, I've tried nb8, nb10 on jdk8, jdk11, with g1gc,
> cmsgc, other gc. They are all UNUSABLY slow. By which I mean, it takes over a
> minute just to open a file.
> Mostly this is because things are waiting for things waiting for very
> inefficiently implemnted file I/O, editor parsing, or things like that. I've
> watched a 12-core Xeon chip spend over 4 hours just attempting to handle the
> Active Reference Queue Daemon thread.
> The slowdown is somewhat incremental - I can escape it as long as I'm happy
> to restart NetBeans every hour or so (which I'm not happy to do).
> Attached a stack dump to get you started, this took over a minute to open a
> 284-line Java file from idle.
> Please feel free to ask all the obvious questions, although I'm fairly sure
> all the obvious things have been done. Mostly, I've got GC down to a
> negligible amount.
> If there's one or more features of NetBeans I can disable to get acceptable
> behaviour while still being able to realistically edit Java code, please tell
> me and I will disable them because I am at the end of my rope after using
> (and developing for) NetBeans for nearly 10 years. If I can get IntelliJ to
> load a Java/Gradle project neatly before this gets fixed, I'm gone.
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