#54 Exception occurred when stepping

[Anonymous]

Originally created by: hivemin...@gmail.com

SDK/Debugger version: 0.3.0
Eclipse version: 3.7 (indigo)
Google Chrome/V8 Embedder + version: 16.0.912.59 beta-m
OS + version: windows 7

What steps will reproduce the problem?

1. launch debug with Webkit Protocol (Wip Backend: WK@97678)
2. add breakpoint to js in virtual project
3. suspended by hitting breakpoint
4. press f5 in eclipse (step into)

What is the expected result?
No exception.

What happens instead?
NPE occurred.

I guess following code casuse NPE.

org.chromium.debug.core.model.ConnectedTargetData.DebugEventListenerImpl.resumed() {
...
singleThread.getRemoteEventListener().resumed(null);
}

org.chromium.debug.core.model.JavascriptThread.RemoteEventListener.resumed(ResumeReason) function can't accept null as argument.

Please provide any additional information below. If possible, attach a
(reduced) test-case.

Exception:
eclipse.buildId=M20110909-1335
java.version=1.6.0_23
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=ko_KR
Framework arguments:  -product org.eclipse.epp.package.modeling.product
Command-line arguments:  -os win32 -ws win32 -arch x86 -product org.eclipse.epp.package.modeling.product

Error
Fri Dec 09 14:52:42 KST 2011
An internal error has occurred.

java.lang.NullPointerException
    at org.chromium.debug.core.model.JavascriptThread$ResumeReason.access$3(JavascriptThread.java:559)
    at org.chromium.debug.core.model.JavascriptThread$RunningState.isStepping(JavascriptThread.java:383)
    at org.chromium.debug.core.model.JavascriptThread.isStepping(JavascriptThread.java:236)
    at org.chromium.debug.core.model.StackFrameBase.isStepping(StackFrameBase.java:39)
    at org.eclipse.debug.internal.ui.viewers.update.DefaultSelectionPolicy.isSticky(DefaultSelectionPolicy.java:110)
    at org.eclipse.debug.internal.ui.viewers.update.DefaultSelectionPolicy.overrides(DefaultSelectionPolicy.java:87)
    at org.eclipse.debug.internal.ui.viewers.update.DefaultSelectionPolicy.overrides(DefaultSelectionPolicy.java:69)
    at org.eclipse.debug.internal.ui.viewers.model.InternalTreeModelViewer.overrideSelection(InternalTreeModelViewer.java:1710)
    at org.eclipse.debug.internal.ui.viewers.model.TreeModelContentProvider.handleSelect(TreeModelContentProvider.java:353)
    at org.eclipse.debug.internal.ui.viewers.model.ModelContentProvider.updateNodes(ModelContentProvider.java:1464)
    at org.eclipse.debug.internal.ui.viewers.model.ModelContentProvider.updateNodes(ModelContentProvider.java:1469)
    at org.eclipse.debug.internal.ui.viewers.model.ModelContentProvider.updateNodes(ModelContentProvider.java:1469)
    at org.eclipse.debug.internal.ui.viewers.model.ModelContentProvider.updateNodes(ModelContentProvider.java:1469)
    at org.eclipse.debug.internal.ui.viewers.model.ModelContentProvider.updateModel(ModelContentProvider.java:1414)
    at org.eclipse.debug.internal.ui.viewers.model.ModelContentProvider.doModelChanged(ModelContentProvider.java:1385)
    at org.eclipse.debug.internal.ui.viewers.model.ModelContentProvider.access$8(ModelContentProvider.java:1379)
    at org.eclipse.debug.internal.ui.viewers.model.ModelContentProvider$14.runInUIThread(ModelContentProvider.java:1369)
    at org.eclipse.ui.progress.UIJob$1.run(UIJob.java:95)
    at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
    at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
    at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4140)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3757)
    at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696)
    at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660)
    at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494)
    at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667)
    at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
    at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)
    at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
    at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)
    at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
    at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
    at org.eclipse.equinox.launcher.Main.run(Main.java:1410)

[Anonymous]

Originally posted by: peter.ry...@gmail.com

(No comment was entered for this change.)

Status: Accepted

[Anonymous]

Originally posted by: peter.ry...@gmail.com

Thank you for reporting.
Do you know how "resumed" event comes alone (without response for any step/continue command)? Normally SDK send step_* and receives response. "Resumed" event is ignored.

[Anonymous]

Originally posted by: peter.ry...@gmail.com

Fixed in HEAD.

[Anonymous]

Originally posted by: peter.ry...@gmail.com

Fixed in 0.3.2

Status: Fixed

[Anonymous]

Originally posted by: gkorl...@gmail.com

I'm still getting this error with 0.3.4 when trying to connect in remote debug.

java.lang.NullPointerException
    at org.chromium.debug.core.model.ConnectedTargetData$DebugEventListenerImpl.disconnected(ConnectedTargetData.java:294)
    at org.chromium.sdk.internal.standalonev8.StandaloneVmImpl.onDebuggerDetachedImpl(StandaloneVmImpl.java:174)
    at org.chromium.sdk.internal.standalonev8.StandaloneVmImpl.detach(StandaloneVmImpl.java:152)
    at org.chromium.debug.core.model.DebugTargetImpl$1.destruct(DebugTargetImpl.java:77)
    at org.chromium.sdk.util.DestructingGuard.doFinally(DestructingGuard.java:32)
    at org.chromium.debug.ui.launcher.LaunchTypeBase.launch(LaunchTypeBase.java:101)
    at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:854)
    at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:703)
    at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:937)
    at org.eclipse.debug.internal.ui.DebugUIPlugin$8.run(DebugUIPlugin.java:1141)
    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

Chromium JavaScript Remote Debugger=0.3.4.201202250214
eclipse.buildId=M20120208-0800
java.version=1.7.0_03
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Framework arguments:  -product org.eclipse.epp.package.jee.product
Command-line arguments:  -os linux -ws gtk -arch x86_64 -product org.eclipse.epp.package.jee.product

[Anonymous]

Originally posted by: colin.br...@gmail.com

I am also seeing the same exception using 0.3.4 with a fresh Indigo Javascript IDE and Node.js 0.6.18

java.lang.NullPointerException
    at org.chromium.debug.core.model.ConnectedTargetData$DebugEventListenerImpl.disconnected(ConnectedTargetData.java:294)

[Anonymous]

Originally posted by: abuck....@gmail.com

I'm having the same issue, I've been figure this out for the past couple hours/days and I can't....please help...thanks.

I'm getting this when I try to launch the debugger (It seems to only happens after I've installed VJET :(

java.lang.NullPointerException
    at org.chromium.debug.core.model.ConnectedTargetData$DebugEventListenerImpl.disconnected(ConnectedTargetData.java:298)
    at org.chromium.sdk.internal.standalonev8.StandaloneVmImpl.onDebuggerDetachedImpl(StandaloneVmImpl.java:174)
    at org.chromium.sdk.internal.standalonev8.StandaloneVmImpl.detach(StandaloneVmImpl.java:152)
    at org.chromium.debug.core.model.DebugTargetImpl$1.destruct(DebugTargetImpl.java:77)
    at org.chromium.sdk.util.DestructingGuard.doFinally(DestructingGuard.java:32)
    at org.chromium.debug.ui.launcher.LaunchTypeBase.launch(LaunchTypeBase.java:108)
    at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:853)
    at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:702)
    at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:924)
    at org.eclipse.debug.internal.ui.DebugUIPlugin$8.run(DebugUIPlugin.java:1128)
    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

eclipse.buildId=M20110210-1200
java.version=1.7.0
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US
Framework arguments:  -product org.eclipse.epp.package.java.product
Command-line arguments:  -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.java.product

Plugins:
  VJET All Features    1.0.0.201105260911    org.ebayopensource.vjet.all.feature.group
  ChromeDevTools SDK WIP Backends    0.1.8.201207022104    org.chromium.sdk.wipbackends.feature.group
  Chromium JavaScript Debugger Bridge to JSDT    0.3.6.201207022103    org.chromium.debug.jsdtbridge.feature.group
  Chromium JavaScript Remote Debugger    0.3.6.201207022103    org.chromium.debug.feature.group

Version: Helios Service Release 2
Build id: 20110218-0911

[Anonymous]

Originally posted by: abuck....@gmail.com

forgot to add the Node.js version: 0.6.19

[Anonymous]

Originally posted by: peter.ry...@gmail.com

It looks like there is an exception while initializing debug session. The problem is that the actual exception is hidden by this (less interesting) NPE.

Do you think you will be able to try to reproduce it with a patched Debugger (which I'm going to prepare)?

[Anonymous]

Originally posted by: peter.ry...@gmail.com

One more thing. Can I ask you please to file a separate issue for his problem. I believe it's not "occurred when stepping" anymore like the title says. This issue is closed.

[Anonymous]

Originally posted by: peter.ry...@gmail.com

Please update to 0.3.6 (to today's build 201207090605). This won't fix your problem, but we should finally see the cause exception. Please bring its stacktrace here.

[Anonymous]

Originally posted by: abuck....@gmail.com

Here we go, I've upgdated my node.js to 0.8.1 and seems that I'm getting a timeout issue now :( see https://code.google.com/p/chromedevtools/issues/detail?id=69&thanks=69&ts=1341807943

thanks for looking at this, appreciated ! if you need any info or want me to try something, let me know, I'm more than open to help :)

[Anonymous]

Originally posted by: peter.ry...@gmail.com

I meant please update ChromeDevTools to 0.3.6
You better keep old Node.js, new one does get stuck for debug requests.
https://github.com/joyent/node/issues/3626
I sent them a fix, but I have no idea whether it will get in:
https://github.com/prybin/node/tree/dispatch_debug_messages

[Anonymous]

Originally posted by: abuck....@gmail.com

Yeah, sorry, I did updated to latest ChromeDevTools to 0.3.6 but thought it was a good idea to update node.js in the same time. Anyway, I downgraded node.js to 0.6.19 and getting other issues (I'll update with the other thread).

[Anonymous]

Originally posted by: peter.ry...@gmail.com

Theoretically one can apply the patch and compile Node.JS himself, but it could be not too convenient.