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https://issues.apache.org/jira/browse/NETBEANS-5177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17261858#comment-17261858
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Mike Ryan commented on NETBEANS-5177:
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I'm seeing the same thing on macOS BigSur, but it was also happening to me on
Catalina as well. I never ran into this problem in 12.1 and my current
workaround is to just use 12.1.
I posted the following in the users mailing list. Hopefully this helps. Please
let me know if there's other info I could provide that will help debug this.
The windows I saw had messages like :
• Folder org-netbeans-api-project-libraries already exists in
/Users/blah/Library/Application Support/NetBeans/ 12.2/config
• Cannot get exclusive access to /Users/blah/Library/Application
Support/NetBeans/12.2/build.properties@bad1856d:5a70225a (probably opened for
reading)
Here's the thread dump. As I said on the mailing list, my terminal cut off the
full dump so I only have the tail end of it.
[^thread_dump.rtf]
> Crash: cannot get exclusive access to uihandler.properties
> ----------------------------------------------------------
>
> Key: NETBEANS-5177
> URL: https://issues.apache.org/jira/browse/NETBEANS-5177
> Project: NetBeans
> Issue Type: Bug
> Affects Versions: 12.2
> Reporter: Ulrich Mayring
> Priority: Blocker
> Attachments: sc.png, screenshot2.png
>
>
> I experienced a number of total freezes after installing NB 12.2 (have been
> using 12.0 before), but could not get an error message of any sort, since NB
> was completely unresponsive to keystrokes or mouse. This changed today, I got
> an error popup, which I attach. NB was again totally unresponsive, but I
> could make a screenshot of the popup message.
> The black shadow around the error dialog actually is tens or hundreds of the
> same popup windows behind the first one. They keep piling up at CPU speed
> until the app runs out of memory or is killed. For a while I could close a
> few of them, but they kept coming up faster than I could click.
> The file in question (see screenshot) looks normal to me. It has the correct
> owner and permissions and its content is this:
> count=1000
> MTTF=71985
> uihandler.preferences.writable.check=1608633016127
> The crash happened directly after starting the IDE, while it was reading in
> the last project I worked on. No user interaction was involved.
> Fedora 29 / KDE.
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