Description Alexander Veit 2009-11-11 09:36:13 EST

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.1.5) Gecko/20091102 Firefox/3.5.5 (.NET CLR 3.5.30729)
Build Identifier: Build id: 20090920-1017

From time to time eclipse emits the following error. Then the open type dialog does not work anymore.

An internal error occurred during: "Items filtering".

java.lang.IllegalArgumentException: Class file name must end with .class
	at org.eclipse.jdt.internal.core.PackageFragment.getClassFile(PackageFragment.java:194)
	at org.eclipse.jdt.internal.core.search.TypeNameMatchRequestorWrapper.createTypeFromPath(TypeNameMatchRequestorWrapper.java:191)
	at org.eclipse.jdt.internal.core.search.TypeNameMatchRequestorWrapper.acceptType(TypeNameMatchRequestorWrapper.java:107)
	at org.eclipse.jdt.internal.core.search.BasicSearchEngine$3.acceptIndexMatch(BasicSearchEngine.java:1111)
	at org.eclipse.jdt.core.search.SearchPattern.acceptMatch(SearchPattern.java:299)
	at org.eclipse.jdt.core.search.SearchPattern.findIndexMatches(SearchPattern.java:2124)
	at org.eclipse.jdt.internal.core.search.matching.MatchLocator.findIndexMatches(MatchLocator.java:336)
	at org.eclipse.jdt.internal.core.search.PatternSearchJob.search(PatternSearchJob.java:97)
	at org.eclipse.jdt.internal.core.search.PatternSearchJob.execute(PatternSearchJob.java:63)
	at org.eclipse.jdt.internal.core.search.processing.JobManager.performConcurrentJob(JobManager.java:276)
	at org.eclipse.jdt.internal.core.search.BasicSearchEngine.searchAllTypeNames(BasicSearchEngine.java:1122)
	at org.eclipse.jdt.core.search.SearchEngine.searchAllTypeNames(SearchEngine.java:815)
	at org.eclipse.jdt.internal.ui.dialogs.FilteredTypesSelectionDialog.fillContentProvider(FilteredTypesSelectionDialog.java:556)
	at org.eclipse.ui.dialogs.FilteredItemsSelectionDialog$FilterJob.filterContent(FilteredItemsSelectionDialog.java:2182)
	at org.eclipse.ui.dialogs.FilteredItemsSelectionDialog$FilterJob.internalRun(FilteredItemsSelectionDialog.java:2124)
	at org.eclipse.ui.dialogs.FilteredItemsSelectionDialog$FilterJob.doRun(FilteredItemsSelectionDialog.java:2096)
	at org.eclipse.ui.dialogs.FilteredItemsSelectionDialog$FilterJob.run(FilteredItemsSelectionDialog.java:2083)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

If you are luck you may be able to fix this by deleting index files (I'm missing the reindexing function in the Eclipse menu). If you are not so lucky you have to find the resource that produces the error and remove it. This usually causes a lot of pain.

To relieve the pain it would be nice if the error message would inform the user not only that "Class file name must end with .class" but also what the name was that Eclipse encountered. With other words Eclipse should not scoff at the poor user.

Reproducible: Sometimes

Steps to Reproduce:
1. I don't know how to reproduce it.