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https://issues.apache.org/jira/browse/NETBEANS-4696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17187354#comment-17187354
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Glenn Holmer commented on NETBEANS-4696:
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Just saw it again, this time when upgrading one of my laptops to 12.1-vc1. It 
was on first start. I had renamed my existing user and cache dirs from 
12.1-beta4 to 12.1, although I wouldn't think that would matter. I was able 
close NetBeans normally, but the symptoms were as above: "opening projects" 
stuck at 20% on five projects; one out of five projects showed its versioning 
label. Added 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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