Description Michaelsdev S 2013-06-11 08:50:27 EDT

Hello,

I ran into a critical endless loop (Unhandled event loop exception) causing a stack overflow when using swt.

At first it looked like this:
Instantiation of a Composite without setting a layout was immediately followed by the crash.
Setting a layout afterwards solved it, but there is a deeper problem.

I narrowed the problem down to a call of
SWT.widgets.Control.computeSize(SWT.DEFAULT, SWT.DEFAULT), 
which might be calling user widgets to get into a loop.
see bottom line of the log below.


Best regards 
michael



Eclipse for RCP and RAP Developers

Version: Indigo Service Release 2
Build id: 20120216-1857


The Log:
!SESSION 2013-06-11 13:26:39.235 -----------------------------------------------
eclipse.buildId=M20120208-0800
java.version=1.7.0_03
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=de_DE
Framework arguments:  -product org.eclipse.platform.ide



Created Time: 2013-06-11 13:27:29.396

!ENTRY org.eclipse.ui 4 0 2013-06-11 13:27:29.396
!MESSAGE Unhandled event loop exception
!STACK 0
org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.StackOverflowError)
	at org.eclipse.swt.SWT.error(SWT.java:4282)
	at org.eclipse.swt.SWT.error(SWT.java:4197)
	at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:138)
	at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3563)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3212)
	at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)
	at org.eclipse.jface.window.Window.open(Window.java:801)
	at org.eclipse.jface.dialogs.MessageDialog.open(MessageDialog.java:334)
	at org.eclipse.ui.internal.ide.dialogs.InternalErrorDialog.open(InternalErrorDialog.java:80)
	at org.eclipse.ui.internal.ide.IDEWorkbenchErrorHandler.openQuestionDialog(IDEWorkbenchErrorHandler.java:199)
	at org.eclipse.ui.internal.ide.IDEWorkbenchErrorHandler.handleException(IDEWorkbenchErrorHandler.java:154)
	at org.eclipse.ui.internal.ide.IDEWorkbenchErrorHandler.access$0(IDEWorkbenchErrorHandler.java:146)
	at org.eclipse.ui.internal.ide.IDEWorkbenchErrorHandler$1.runInUIThread(IDEWorkbenchErrorHandler.java:121)
	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:3563)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3212)
	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2701)
	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2665)
	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2499)
	at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:679)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:668)
	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:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:601)
	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)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
Caused by: java.lang.StackOverflowError
	at org.eclipse.swt.widgets.Composite._getChildren(Composite.java:105)
	at org.eclipse.swt.widgets.Composite.minimumSize(Composite.java:1228)
	at org.eclipse.swt.widgets.Composite.computeSize(Composite.java:226)
	at org.eclipse.swt.widgets.Control.computeSize(Control.java:494)
	at 

mycustomXYComposite.getClientArea(mycustomXYComposite.java:204)
	at myOthereCustomXComposite.getClientArea(myOthereCustomXComposite.java:75)
	at org.eclipse.swt.widgets.Composite.minimumSize(Composite.java:1229)
	at org.eclipse.swt.widgets.Composite.computeSize(Composite.java:226)
	at org.eclipse.swt.widgets.Control.computeSize(Control.java:494)
	at 
mycustomXYComposite.getClientArea(mycustomXYComposite.java:204)
	at myOthereCustomXComposite.getClientArea(myOthereCustomXComposite.java:75)
	at org.eclipse.swt.widgets.Composite.minimumSize(Composite.java:1229)
	at org.eclipse.swt.widgets.Composite.computeSize(Composite.java:226)
	at org.eclipse.swt.widgets.Control.computeSize(Control.java:494)
	at 
mycustomXYComposite.getClientArea(mycustomXYComposite.java:204)
	at myOthereCustomXComposite.getClientArea(myOthereCustomXComposite.java:75)
	at org.eclipse.swt.widgets.Composite.minimumSize(Composite.java:1229)
	at org.eclipse.swt.widgets.Composite.computeSize(Composite.java:226)
	at org.eclipse.swt.widgets.Control.computeSize(Control.java:494)
mycustomXYComposite.getClientArea(mycustomXYComposite.java:204)
	at 
myOthereCustomXComposite.getClientArea(myOthereCustomXComposite.java:75)
	at org.eclipse.swt.widgets.Composite.minimumSize(Composite.java:1229)
	at org.eclipse.swt.widgets.Composite.computeSize(Composite.java:226)
	at org.eclipse.swt.widgets.Control.computeSize(Control.java:494)

looping