Eclipse is suddenly very unhappy. A project and workspace I've been
using without incident for weeks is suddenly throwing an NPE during
Eclipse initialization. The package hierarchy window doesn't appear,
and the effect of most commands is to generate errors and
corresponding log messages.

Here's the log file. This entry is actually repeated many times. I'm
wondering if switching to Helix might clear this issue. Any other
suggestions?


!ENTRY org.eclipse.jdt.ui 4 2 2011-01-14 17:22:58.217
!MESSAGE Problems occurred when invoking code from plug-in:
"org.eclipse.jdt.ui".
!STACK 0
java.lang.NullPointerException
        at
com.android.sdklib.internal.project.ProjectProperties.parsePropertyFile(ProjectProperties.java:
349)
        at
com.android.sdklib.internal.project.ProjectProperties.load(ProjectProperties.java:
223)
        at
com.android.sdklib.internal.project.ProjectProperties.load(ProjectProperties.java:
209)
        at
com.android.ide.eclipse.adt.internal.sdk.Sdk.getProjectState(Unknown
Source)
        at
com.android.ide.eclipse.adt.internal.project.AndroidClasspathContainerInitializer.allocateAndroidContainer(Unknown
Source)
        at
com.android.ide.eclipse.adt.internal.project.AndroidClasspathContainerInitializer.initialize(Unknown
Source)
        at
org.eclipse.jdt.internal.core.JavaModelManager.initializeContainer(JavaModelManager.java:
2642)
        at
org.eclipse.jdt.internal.core.JavaModelManager.getClasspathContainer(JavaModelManager.java:
1813)
        at org.eclipse.jdt.core.JavaCore.getClasspathContainer(JavaCore.java:
2652)
        at
org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:
2578)
        at
org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:
2679)
        at
org.eclipse.jdt.internal.core.JavaProject.getResolvedClasspath(JavaProject.java:
1866)
        at
org.eclipse.jdt.internal.core.JavaProject.buildStructure(JavaProject.java:
424)
        at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:
258)
        at
org.eclipse.jdt.internal.core.JavaElement.openWhenClosed(JavaElement.java:
515)
        at
org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:
252)
        at
org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:
238)
        at
org.eclipse.jdt.internal.core.JavaProject.getJavaProjectElementInfo(JavaProject.java:
1561)
        at
org.eclipse.jdt.internal.core.JavaProject.newNameLookup(JavaProject.java:
2258)
        at
org.eclipse.jdt.internal.core.SearchableEnvironment.<init>(SearchableEnvironment.java:
57)
        at
org.eclipse.jdt.internal.core.SearchableEnvironment.<init>(SearchableEnvironment.java:
64)
        at
org.eclipse.jdt.internal.core.CancelableNameEnvironment.<init>(CancelableNameEnvironment.java:
26)
        at
org.eclipse.jdt.core.dom.CompilationUnitResolver.resolve(CompilationUnitResolver.java:
509)
        at
org.eclipse.jdt.core.dom.ASTParser.internalCreateAST(ASTParser.java:
931)
        at org.eclipse.jdt.core.dom.ASTParser.createAST(ASTParser.java:677)
        at org.eclipse.jdt.internal.ui.javaeditor.ASTProvider
$1.run(ASTProvider.java:544)
        at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
        at
org.eclipse.jdt.internal.ui.javaeditor.ASTProvider.createAST(ASTProvider.java:
537)
        at
org.eclipse.jdt.internal.ui.javaeditor.ASTProvider.getAST(ASTProvider.java:
478)
        at org.eclipse.jdt.ui.SharedASTProvider.getAST(SharedASTProvider.java:
126)
        at
org.eclipse.jdt.internal.ui.viewsupport.SelectionListenerWithASTManager
$PartListenerGroup.calculateASTandInform(SelectionListenerWithASTManager.java:
169)
        at
org.eclipse.jdt.internal.ui.viewsupport.SelectionListenerWithASTManager
$3.run(SelectionListenerWithASTManager.java:154)
        at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)


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