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https://issues.apache.org/jira/browse/NETBEANS-5177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17262218#comment-17262218
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Laszlo Kishalmi commented on NETBEANS-5177:
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Most likely the issue is here:
[https://github.com/apache/netbeans/blob/78a9cedc8ac66e6cb6fabfd637b8139d9c28ea14/extide/gradle/src/org/netbeans/modules/gradle/GradleModuleFileCache21.java#L195]
Files.list() shall be called in try with resources, otherwise it won't return
the directory handles to the OS.
> 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
> Components: projects - Gradle
> Affects Versions: 12.2
> Reporter: Ulrich Mayring
> Assignee: Laszlo Kishalmi
> Priority: Blocker
> Attachments: messages.log, sc.png, screenshot2.png, thread_dump.rtf
>
>
> 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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