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Posted to notifications@netbeans.apache.org by "dca00 (via GitHub)" <gi...@apache.org> on 2026/10/02 14:30:28 UTC
[I] CPUs intermitently pinned [netbeans]
dca00 opened a new issue, #9653:
URL: https://github.com/apache/netbeans/issues/9653
### Apache NetBeans version
Apache NetBeans 31
### What happened
OpenJDK 21, Netbeans 31 also 28.
Often while editing files in a Java project, I notice that 1/2 or all CPU cores are pinned by Netbeans Java process. Closing and re-opening drops the CPU utilization to zero until the next time. Happens a dozen times a day.
### Language / Project Type / NetBeans Component
Java Maven
### How to reproduce
Edit some Java project units for some time
### Did this work correctly in an earlier version?
No / Don't know
### Operating System
Fedora Linux 42
### JDK
openjdk 21.0.10 2026-01-20 OpenJDK Runtime Environment (Red_Hat-21.0.10.0.7-2) (build 21.0.10+7) OpenJDK 64-Bit Server VM (Red_Hat-21.0.10.0.7-2) (build 21.0.10+7, mixed mode, sharing)
### Apache NetBeans packaging
Apache NetBeans binary zip
### Anything else
every 13-30 min
### Are you willing to submit a pull request?
No
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "dca00 (via GitHub)" <gi...@apache.org>.
dca00 commented on issue #9653:
URL: https://github.com/apache/netbeans/issues/9653#issuecomment-5995560970
What would be issue indicators?
<img width="826" height="1753" alt="Image" src="https://github.com/user-attachments/assets/415e7f00-23b1-4f53-97a4-f7375c954ba9" />
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "dca00 (via GitHub)" <gi...@apache.org>.
dca00 commented on issue #9653:
URL: https://github.com/apache/netbeans/issues/9653#issuecomment-5971419485
Your web site states that 17+ are supported. Is it outdated?
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "dca00 (via GitHub)" <gi...@apache.org>.
dca00 commented on issue #9653:
URL: https://github.com/apache/netbeans/issues/9653#issuecomment-5958387957
It's pinning 1/2 CPUs right now and displays "Checking for external changes (Suspended)" in the status bar.
As I was typing the above line, the status bar text/progress bar disappeared and appeared again after a minute. The CPUs remained pinned.
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "neilcsmith-net (via GitHub)" <gi...@apache.org>.
neilcsmith-net closed issue #9653: CPUs intermitently pinned
URL: https://github.com/apache/netbeans/issues/9653
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "dca00 (via GitHub)" <gi...@apache.org>.
dca00 commented on issue #9653:
URL: https://github.com/apache/netbeans/issues/9653#issuecomment-5971718356
Only one of the two can be true at the same time:
1. The site is up to date, and 21 is supported. This issue should be resolved as it is.
2. The site is outdated, and 21 is not supported. The site should be updated.
Which of the 2x is it?
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "neilcsmith-net (via GitHub)" <gi...@apache.org>.
neilcsmith-net commented on issue #9653:
URL: https://github.com/apache/netbeans/issues/9653#issuecomment-5972129171
Actually, neither of those things are true.
The current NetBeans release supports running on JDK 21, 25 and 26 (with early support for 27). The site also _recommends_ running on the latest update of the latest supported JDK for the best experience. If issues are caused by the JDK, that's out of our hands.
There's some curious exceptions in those log files. Bunch of exceptions around debugging, local indexing, file access. There's also complaints about the source level of the Java platform, which suggest some misconfiguration in the JDK registration.
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "dca00 (via GitHub)" <gi...@apache.org>.
dca00 commented on issue #9653:
URL: https://github.com/apache/netbeans/issues/9653#issuecomment-5955435090
Maven indexing is off.
I attached the logs for your perusal. Renamed so as to satisfy github's filter.
[messages.log](https://github.com/user-attachments/files/32968270/messages.log)
[messages.1.log](https://github.com/user-attachments/files/32968286/messages.1.log)
[messages.2.log](https://github.com/user-attachments/files/32968288/messages.2.log)
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "dca00 (via GitHub)" <gi...@apache.org>.
dca00 commented on issue #9653:
URL: https://github.com/apache/netbeans/issues/9653#issuecomment-5984673426
> Seriously testing a different JDK takes you a few minutes to setup: download a ZIP distribution, expand it, change netbeans.conf to that JDK and just run it. I won't waste anymore time on this.
For me, it would entail much more. The system is provisioned to me, and I am only authorized to write/debug the code. I'd have to procure a system or a VM, install the OS, and reproduce the Java environment and Netbeans.
> which suggest some misconfiguration in the JDK registration.
What does the configuring? As far as I was told, it's installed from the Fedora repo. Does it mean that the Fedora maintainer messes up with the JDK?
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "dca00 (via GitHub)" <gi...@apache.org>.
dca00 commented on issue #9653:
URL: https://github.com/apache/netbeans/issues/9653#issuecomment-5995639403
> I have a feeling that many, maybe all, of your issues stem from a configuration issue with either the JDK or your projects. Please don't keep opening issues until that is considered. We're a small, volunteer team here picking these up! Most things you've reported are not the normal behaviour with a properly configured setup.
I recall most of these issues lingering on since at least Netbeans 7.2, on many systems that I built myself and received provisioned by the client's IT departments over the past 13 or so years. I did not bother reporting them to Oralcle or Apache as back then. Now with Github it is less onerous so I do. They are not one-offs from this particular system, which was also provisioned to me, like I had written. They are systemic issues with the stability of the product. You should not keep insisting on my making changes to the system after I've stated that as I have neither OS permissions nor institutional.
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "neilcsmith-net (via GitHub)" <gi...@apache.org>.
neilcsmith-net commented on issue #9653:
URL: https://github.com/apache/netbeans/issues/9653#issuecomment-5955227901
Anything in the status bar? Do you always close and reopen? Does anything claim to be active when you do? Anything show up in the log file (`~/.netbeans/31/var/log/messages.log`) after you quit? It sounds a lot like Maven repository indexing kicking in to me.
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "dca00 (via GitHub)" <gi...@apache.org>.
dca00 commented on issue #9653:
URL: https://github.com/apache/netbeans/issues/9653#issuecomment-5961943435
Had to rename them from .npss to .log for GH to allow the upload
[selfSampler.log](https://github.com/user-attachments/files/32982290/selfSampler.log)
[selfsampler2.log](https://github.com/user-attachments/files/32982291/selfsampler2.log)
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "neilcsmith-net (via GitHub)" <gi...@apache.org>.
neilcsmith-net commented on issue #9653:
URL: https://github.com/apache/netbeans/issues/9653#issuecomment-5996370898
> They are systemic issues with the stability of the product. You should not keep insisting on my making changes to the system after I've stated that as I have neither OS permissions nor institutional.
Most are not systemic because if they were they'd have been picked up and likely fixed by now. I'm not insisting on you making changes to your system, I'm with Matthias, and telling you it's a waste of our time and yours to not rule out some basic issues. You're the one who's working for a client - we're volunteering our free time to try and help.
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "matthiasblaesing (via GitHub)" <gi...@apache.org>.
matthiasblaesing commented on issue #9653:
URL: https://github.com/apache/netbeans/issues/9653#issuecomment-5971335132
Then analysis stops for me at this point. I'm on linux, encrypted disc (so high chance for high CPU usage), recent JDK, no problems.
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "matthiasblaesing (via GitHub)" <gi...@apache.org>.
matthiasblaesing commented on issue #9653:
URL: https://github.com/apache/netbeans/issues/9653#issuecomment-5958539491
Please activate the "Performance" Toolbar (right click of symbols, check Performance), Activate "Profile the IDE" (second to last icon) wait a bit while the situation is still visible. Click the icon again. This stops profiling and gives you a summary. In the summary window you can save the profile, please provide the resulting file.
<img width="1117" height="575" alt="Image" src="https://github.com/user-attachments/assets/66ae57d4-24ee-4aca-b379-68fb042f164d" />
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "matthiasblaesing (via GitHub)" <gi...@apache.org>.
matthiasblaesing commented on issue #9653:
URL: https://github.com/apache/netbeans/issues/9653#issuecomment-5971563998
> Your web site states that 17+ are supported. Is it outdated?
NetBeans run normally on LTS - 1 so at this point in time that is JDK 21. It is luck if it runs on anything lower. That is one side of the coin. The other is, that older JDKs don't get the same attention as current mainline, so there might be fixes in JDK 27 that affect you (that are 3 years of development you are missing on 21). I don't say, that that will fix anything, but it makes no sense to chase ghosts.
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "neilcsmith-net (via GitHub)" <gi...@apache.org>.
neilcsmith-net commented on issue #9653:
URL: https://github.com/apache/netbeans/issues/9653#issuecomment-5995024521
> What does the configuring? As far as I was told, it's installed from the Fedora repo. Does it mean that the Fedora maintainer messes up with the JDK?
Kind of. Linux distros have a tendency to split things up, symlink things, etc. that can sometimes cause NetBeans to fail to find things in the JDK. Our old Linux installers used to show similar errors sometimes because they found a `java` binary outside of the expected JDK structure. It might be that the install is missing a required part of the JDK. Have a look at `Tools / Java Platforms` - it might show an issue - are Classes and Sources populated for the JDK?
I have a feeling that many, maybe all, of your issues stem from a configuration issue with either the JDK or your projects. Please don't keep opening issues until that is considered. Most things you've reported are not the normal behaviour with a properly configured setup.
Did you install NetBeans yourself? If so, you should have the permissions to extract a JDK and point NetBeans to it on the CLI. If that is not possible, then push this back up to who did the provisioning.
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "matthiasblaesing (via GitHub)" <gi...@apache.org>.
matthiasblaesing commented on issue #9653:
URL: https://github.com/apache/netbeans/issues/9653#issuecomment-5972100257
Seriously testing a different JDK takes you a few minutes to setup: download a ZIP distribution, expand it, change netbeans.conf to that JDK and just run it. I won't waste anymore time on this.
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "dca00 (via GitHub)" <gi...@apache.org>.
dca00 commented on issue #9653:
URL: https://github.com/apache/netbeans/issues/9653#issuecomment-5997357990
> Most are not systemic
They are systemic by virtue of being present in dozens of versions for almost 15 years, despite some of them having been reported.
I am also the party the least motivated to worry about the bugs in this product, so I'll retire to keep you content with its current state.
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "matthiasblaesing (via GitHub)" <gi...@apache.org>.
matthiasblaesing commented on issue #9653:
URL: https://github.com/apache/netbeans/issues/9653#issuecomment-5971250837
Thanks - when looking at the profiles I notice high CPU usage the file system support (Ignore the high numbers fro CLI Requests Server and FileSystemWatchService, both are blocking in Native and only look like they are problematic).
There are many calls to File#canWrite, File#lastModfied, File#isDirectory, File#isFile and File#list. Could it be, that something in the background periodically messes with the files? Are there "special" mounts present (SMB, NFS, Fuse)?
Please also test if the situation improves with a recent JDK.
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Re: [I] CPUs intermitently pinned [netbeans]
Posted by "dca00 (via GitHub)" <gi...@apache.org>.
dca00 commented on issue #9653:
URL: https://github.com/apache/netbeans/issues/9653#issuecomment-5971319390
Nothing that I know of would 'mess' with the files but Netbeans itself.
There are no mounts.
The JDK is locked by policy.
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