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https://issues.apache.org/jira/browse/NETBEANS-4696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17187238#comment-17187238
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Glenn Holmer commented on NETBEANS-4696:
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I just saw this again on 12.1 vc1. The symptoms are:

Progress bar stalls at "opening projects" with 50% showing.

I've set to show versioning labels, but only two of the four projects I had 
open show them.

If I hit F6 to run a project, I get a beep.

The editor does appear to be working.

I attached another thread dump from VisualVM.

 

> NetBeans 12.1-beta1 sometimes hangs on open
> -------------------------------------------
>
>                 Key: NETBEANS-4696
>                 URL: https://issues.apache.org/jira/browse/NETBEANS-4696
>             Project: NetBeans
>          Issue Type: Bug
>          Components: ide - Performance
>    Affects Versions: 12.1
>         Environment: Linux (Debian "Buster")
> OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.7+10)
>            Reporter: Glenn Holmer
>            Priority: Major
>         Attachments: nb12.1-beta1-thread-dump.png, 
> nb12.1-beta1-thread-dump.txt, netbeans-12.1-thread-dump.txt
>
>
> NetBeans sometimes hangs on startup; the symptom is a stalled "Opening 
> Projects" progress bar. I haven't been able to find a repro case, but I'm 
> attaching a thread dump (from VisualVM) and screen shot.



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