VisualVM indicates that "W32 File Monitor" is constantly using CPU,
regardless of what is happening in the IDE, like it is in a busy loop.
org.netbeans.modules.masterfs.watcher.windows.WindowsNotifier$1.run () 30,109
ms (100%) 30,109 ms (100%)
org.netbeans.modules.masterfs.watcher.windows.WindowsNotifier.access$100
() 30,109 ms (100%) 30,109 ms (100%)
org.netbeans.modules.masterfs.watcher.windows.WindowsNotifier.waitForChange
() 30,109 ms (100%) 30,109 ms (100%)
org.netbeans.modules.masterfs.watcher.windows.$Proxy4.GetQueuedCompletionStatus
() 30,109 ms (100%) 30,109 ms (100%)
com.sun.jna.Library$Handler.invoke () 30,109 ms (100%) 30,109 ms
(100%)
The key difference is that when waiting for the Open Project dialog, CPU
time is also accumulating elsewhere. e.g. in "Inactive Request Processor
Thread"
Inactive RequestProcessor thread [Was:Explorer
Actions/org.netbeans.modules.openide.explorer.ExplorerActionsImpl$ActionStateUpdater]
173,499
ms (100%) 36,594 ms (100%)
org.openide.util.RequestProcessor$Processor.run () 190,800 ms (100%) 36,594
ms (100%)
java.lang.Object.wait[native] () 163,209 ms (81.1%) 0.0 ms (0%)
org.openide.util.lookup.Lookups.executeWith () 37,990 ms (23.4%) 36,594
ms (100%)
Here is a list of hotspots... note that the top 4 items are just constantly
increasing every second.
All I have done since starting the sampling is show the open Project dialog
and cancel it a few times.
[image: image.png]
(Hopefully the screenshot comes through)
Scott
On Fri, Nov 5, 2021 at 4:57 AM Svata Dedic <[email protected]>
wrote:
> Hi,
>
> When it happens again, either run VisualVM in parallel & monitor, or
> take a few thread dumps in sequence (CTRL + \ in console or SIGQUIT
> signal). Maybe the thread dumps could lead us to what blocks project
> open or takes so much time. File a JIRA issue + attach the visualvm
> snapshots or thread dumps. Thanks.
>
> -S.
>
>
> Dne 05. 11. 21 v 4:29 Scott Palmer napsal(a):
> > I've hit this exception a couple times now... I'm just trying to open
> > Gradle projects. Note that the Open Project... dialog takes a very long
> > time to appear, unacceptably long - tens of seconds.
> >
> > java.lang.NullPointerException: Cannot invoke "String.equals(Object)"
> > because "value" is null
> > at
> >
> org.netbeans.core.startup.preferences.NbPreferences.put(NbPreferences.java:154)
> > at
> >
> org.netbeans.core.startup.preferences.NbPreferences.put(NbPreferences.java:149)
> > at
> >
> org.netbeans.modules.project.ui.OpenProjectListSettings.setStringList(OpenProjectListSettings.java:169)
> > at
> >
> org.netbeans.modules.project.ui.OpenProjectListSettings.setOpenProjectsDisplayNames(OpenProjectListSettings.java:219)
> > at
> >
> org.netbeans.modules.project.ui.OpenProjectList.saveProjectList(OpenProjectList.java:1462)
> > at
> >
> org.netbeans.modules.project.ui.OpenProjectList.access$2300(OpenProjectList.java:116)
> > at
> >
> org.netbeans.modules.project.ui.OpenProjectList$10.run(OpenProjectList.java:873)
> > at
> >
> org.netbeans.modules.project.ui.OpenProjectList$10.run(OpenProjectList.java:870)
> > at
> >
> org.netbeans.modules.openide.util.DefaultMutexImplementation.writeAccess(DefaultMutexImplementation.java:229)
> > at org.openide.util.Mutex.writeAccess(Mutex.java:252)
> > at
> >
> org.netbeans.modules.project.ui.OpenProjectList.open(OpenProjectList.java:870)
> > at
> >
> org.netbeans.modules.project.ui.OpenProjectList$6.run(OpenProjectList.java:672)
> > at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418)
> > at
> >
> org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45)
> > at org.openide.util.lookup.Lookups.executeWith(Lookups.java:278)
> > [catch] at
> >
> org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)
> >
>
>
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