Bug 165880

Created attachment 82691 [details]
stacktrace

Fixed in changeset:   133346:bc8516fd60c7
http://hg.netbeans.org/main/rev/bc8516fd60c7

Integrated into 'main-golden', will be available in build *200905250201* on http://bits.netbeans.org/dev/nightly/ (upload may still be in progress)
Changeset: http://hg.netbeans.org/main-golden/rev/bc8516fd60c7
User: mentlicher@netbeans.org
Log: #165880 - Prevent from ConcurrentModificationException.

Build: NetBeans IDE 6.7 RC2 (Build 200906042131)
VM: Java HotSpot(TM) Client VM, 11.3-b02, Java(TM) SE Runtime Environment, 1.6.0_13-b03
OS: Linux, 2.6.28-11-generic, i386

User Comments: 


Stacktrace: 
java.util.ConcurrentModificationException
        at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
        at java.util.AbstractList$Itr.next(AbstractList.java:343)
        at org.netbeans.modules.debugger.jpda.models.ThreadsCache.setVirtualMachine(ThreadsCache.java:133)
        at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.setRunning(JPDADebuggerImpl.java:1316)
        at org.netbeans.modules.debugger.jpda.actions.StartActionProvider.doStartDebugger(StartActionProvider.java:203)
        at org.netbeans.modules.debugger.jpda.actions.StartActionProvider.access$100(StartActionProvider.java:73)

Created attachment 83452 [details]
stacktrace

Since this is trivial to fix, marking as a candidate for 67 patch.

Build: NetBeans IDE 6.7 RC3 (Build 200906142201)
VM: Java HotSpot(TM) Client VM, 11.3-b02, Java(TM) SE Runtime Environment, 1.6.0_13-b03
OS: Linux, 2.6.28-11-generic, i386

User Comments: 


Stacktrace: 
java.util.ConcurrentModificationException
        at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
        at java.util.AbstractList$Itr.next(AbstractList.java:343)
        at org.netbeans.modules.debugger.jpda.models.ThreadsCache.setVirtualMachine(ThreadsCache.java:133)
        at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.setRunning(JPDADebuggerImpl.java:1316)
        at org.netbeans.modules.debugger.jpda.actions.StartActionProvider.doStartDebugger(StartActionProvider.java:203)
        at org.netbeans.modules.debugger.jpda.actions.StartActionProvider.access$100(StartActionProvider.java:73)

Created attachment 83678 [details]
stacktrace

big_al or anyone who experienced this, can you, please, verify?

It's still there when you start debugging an application for the first time. After the first time it goes away until restarting NetBeans.

In which NetBeans version is it there?
Can you please attach the exception here?

Looking at http://statistics.netbeans.org/exceptions/detail.do?id=151678 it's apparent that this exception is thrown in
6.7 builds and dev builds older than 200905250201. Therefore I believe this is really fixed.

Please note that this issue is fixed in 6.8 (dev) builds only and newer than 200905250201.
Please verify in 6.8 (dev) build. Thanks.

99.9% of the IDE users arent't interested in any dev builds at all. 
We need this fix patched into the 6.7 release *Real Soon Now*. Thanks.

limo42, before we can add this fix to 67patch, it needs to be verified that it is really fixed. I would verify it
myself, but there are no steps to reproduce this issue. If you can provide some steps to reproduce and/or a sample
project where this issue occurs, it will be greatly appreciated.

I'll download a dev release over the weekend and try it out.

To reproduce on 6.7:

1. Start NetBeans
2. Invoke the "Debug" option for a Maven enterprise application

You'll see the Exception icon in the status bar

I believe the Exception appears when invoking the "Debug" option for other project types, but haven't verified as I'm mainly working on Maven projects.

I played around a bit and managed to reproduce this in an older build, but not in the latest dev build. Marking as
verified. Thanks everyone :)

Such problem is too hardly to reproduce.
Its appears first time yesterday when I migrated to release of NetBeans IDE 6.7 (Build 200906241340), clean&build out
JAVA project and run it in debug mode.
The second attempt was successful.
Second time its appears at the end of day.
Today it doesn't appears.

I'm very happy that resolved another synchronization problem - conflict on file access between 'Project scanning' and 
'Build' in 6.5, now its nether scan during build.

Reproduces for a large module suite project in the 6.7 release, but doesn't happen anymore in 
the latest 6.8 nightly, NetBeans IDE Dev (Build 200907030200).
So, I'd say your're ready to go for that patch. Thanks, everybody.

The fix has been ported into the release67_fixes repository.
http://hg.netbeans.org/release67_fixes/rev/9631daf2927e

Build: NetBeans IDE 6.7 (Build 200906241340)
VM: Java HotSpot(TM) Client VM, 14.0-b16, Java(TM) SE Runtime Environment, 1.6.0_14-b08
OS: Linux, 2.6.28-13-generic, i386

User Comments: 


Stacktrace: 
java.util.ConcurrentModificationException
        at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
        at java.util.AbstractList$Itr.next(AbstractList.java:343)
        at org.netbeans.modules.debugger.jpda.models.ThreadsCache.setVirtualMachine(ThreadsCache.java:133)
        at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.setRunning(JPDADebuggerImpl.java:1316)
        at org.netbeans.modules.debugger.jpda.actions.StartActionProvider.doStartDebugger(StartActionProvider.java:203)
        at org.netbeans.modules.debugger.jpda.actions.StartActionProvider.access$100(StartActionProvider.java:73)

Created attachment 84649 [details]
stacktrace

Build: NetBeans IDE 6.7 (Build 200906241340)
VM: Java HotSpot(TM) Client VM, 11.3-b02, Java(TM) SE Runtime Environment, 1.6.0_13-b03
OS: Linux, 2.6.24-24-generic, i386

User Comments: 


Stacktrace: 
java.util.ConcurrentModificationException<br/>
        at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)<br/>
        at java.util.AbstractList$Itr.next(AbstractList.java:343)<br/>
        at org.netbeans.modules.debugger.jpda.models.ThreadsCache.setVirtualMachine(ThreadsCache.java:133)<br/>
        at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.setRunning(JPDADebuggerImpl.java:1316)<br/>
        at org.netbeans.modules.debugger.jpda.actions.StartActionProvider.doStartDebugger(StartActionProvider.java:203)<br/>
        at org.netbeans.modules.debugger.jpda.actions.StartActionProvider.access$100(StartActionProvider.java:73)<br/>

Created attachment 84759 [details]
stacktrace

I verified this bug and cannot reproduce again. However, I see that are some reports from later builds. Please, provide
steps to reproduce this issue. Would help us a lot. Thanks. 

Build: NetBeans IDE 6.7 (Build 200906241340)
VM: Java HotSpot(TM) Client VM, 11.3-b02, Java(TM) SE Runtime Environment, 1.6.0_13-b03
OS: Linux, 2.6.24-24-generic, i386

User Comments: 


Stacktrace: 
java.util.ConcurrentModificationException
        at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
        at java.util.AbstractList$Itr.next(AbstractList.java:343)
        at org.netbeans.modules.debugger.jpda.models.ThreadsCache.setVirtualMachine(ThreadsCache.java:133)
        at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.setRunning(JPDADebuggerImpl.java:1316)
        at org.netbeans.modules.debugger.jpda.actions.StartActionProvider.doStartDebugger(StartActionProvider.java:203)
        at org.netbeans.modules.debugger.jpda.actions.StartActionProvider.access$100(StartActionProvider.java:73)

Created attachment 85033 [details]
stacktrace

Build: NetBeans IDE 6.7 (Build 200906241340)
VM: Java HotSpot(TM) 64-Bit Server VM, 14.0-b16, Java(TM) SE Runtime Environment, 1.6.0_14-b08
OS: Linux, 2.6.25.20-0.4-default, amd64

User Comments: 


Stacktrace: 
java.util.ConcurrentModificationException
        at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
        at java.util.AbstractList$Itr.next(AbstractList.java:343)
        at org.netbeans.modules.debugger.jpda.models.ThreadsCache.setVirtualMachine(ThreadsCache.java:133)
        at org.netbeans.modules.debugger.jpda.JPDADebuggerImpl.setRunning(JPDADebuggerImpl.java:1316)
        at org.netbeans.modules.debugger.jpda.actions.StartActionProvider.doStartDebugger(StartActionProvider.java:203)
        at org.netbeans.modules.debugger.jpda.actions.StartActionProvider.access$100(StartActionProvider.java:73)

Created attachment 85464 [details]
stacktrace