Bug 174015

Summary:	[classpath] NPE when replacing the JRE used by a project
Product:	[Eclipse Project] JDT	Reporter:	Olivier Thomann <Olivier_Thomann>
Component:	Core	Assignee:	Jerome Lanneluc <jerome_lanneluc>
Status:	RESOLVED DUPLICATE	QA Contact:
Severity:	normal
Priority:	P3	CC:	frederic_fusier, martinae
Version:	3.3
Target Milestone:	3.3 RC4
Hardware:	PC
OS:	Windows XP
Whiteboard:

Description Olivier Thomann

2007-02-13 11:13:18 EST

eclipse.buildId=I20070209-1006
java.version=1.6.0_01-ea
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=fr_CA
Framework arguments:  -launcher D:\eclipse\I0209\eclipse\eclipse.exe -name Eclipse -startup D:\eclipse\I0209\eclipse\plugins\org.eclipse.equinox.launcher_1.0.0.v20070208a.jar -showlocation
Command-line arguments:  -os win32 -ws win32 -arch x86 -launcher D:\eclipse\I0209\eclipse\eclipse.exe -name Eclipse -startup D:\eclipse\I0209\eclipse\plugins\org.eclipse.equinox.launcher_1.0.0.v20070208a.jar -debug -consolelog -console -showlocation

Steps to reproduce:
1) Start Eclipse
2) JRE 1.4 points to a JRE that is used in one of your project
3) While Eclipse is running, replace the JRE container 1.4 to point to a new location. You update this in the Java>Installed JREs panel.
4) Go to your project and try to open it.
5) The project appears to be empty and the exception below is thrown.

Even if this is not a user case that we might encourage, we should be more resilient to errors.

java.lang.NullPointerException
at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.getPackageFragmentRoots(PackageExplorerContentProvider.java:291)
at org.eclipse.jdt.ui.StandardJavaElementContentProvider.getChildren(StandardJavaElementContentProvider.java:178)
at org.eclipse.jdt.internal.ui.packageview.PackageExplorerContentProvider.getChildren(PackageExplorerContentProvider.java:270)
at org.eclipse.jface.viewers.AbstractTreeViewer.getRawChildren(AbstractTreeViewer.java:1283)
at org.eclipse.jface.viewers.TreeViewer.getRawChildren(TreeViewer.java:394)
at org.eclipse.jdt.internal.ui.viewsupport.ProblemTreeViewer.getFilteredChildren(ProblemTreeViewer.java:205)
at org.eclipse.jface.viewers.AbstractTreeViewer.getSortedChildren(AbstractTreeViewer.java:580)
at org.eclipse.jface.viewers.AbstractTreeViewer$1.run(AbstractTreeViewer.java:774)
at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
at org.eclipse.jface.viewers.AbstractTreeViewer.createChildren(AbstractTreeViewer.java:751)
at org.eclipse.jface.viewers.TreeViewer.createChildren(TreeViewer.java:526)
at org.eclipse.jface.viewers.AbstractTreeViewer.setExpandedState(AbstractTreeViewer.java:2311)
at org.eclipse.jdt.internal.ui.packageview.PackageExplorerActionGroup.handleDoubleClick(PackageExplorerActionGroup.java:301)
at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$4.doubleClick(PackageExplorerPart.java:578)
at org.eclipse.jface.viewers.StructuredViewer$1.run(StructuredViewer.java:798)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.runtime.Platform.run(Platform.java:850)
at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:52)
at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:153)
at org.eclipse.jface.viewers.StructuredViewer.fireDoubleClick(StructuredViewer.java:796)
at org.eclipse.jface.viewers.AbstractTreeViewer.handleDoubleSelect(AbstractTreeViewer.java:1347)
at org.eclipse.jface.viewers.StructuredViewer$4.widgetDefaultSelected(StructuredViewer.java:1167)
at org.eclipse.jface.util.OpenStrategy.fireDefaultSelectionEvent(OpenStrategy.java:237)
at org.eclipse.jface.util.OpenStrategy.access$0(OpenStrategy.java:234)
at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:295)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3490)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3104)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2264)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2228)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2103)
at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:457)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:452)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:101)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:146)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:354)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:169)
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:476)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:416)
at org.eclipse.equinox.launcher.Main.run(Main.java:1124)
at org.eclipse.equinox.launcher.Main.main(Main.java:1099)

Comment 1 Martin Aeschlimann

2007-02-14 09:05:29 EST

The NPE occurs as IPackageFragmentRoot.getRawClasspathEntry() returns null.

It is not spec'ed that this method can return null. Please let us know if this is problem with the spec or with the code in IPackageFragmentRoot.getRawClasspathEntry().

Comment 2 Jerome Lanneluc

2007-06-20 07:58:07 EDT


*** This bug has been marked as a duplicate of bug 162104 ***