Comment #9 to bug 269820 explains how to delete the search index, which appears to be the solution to a corrupt index whose symptoms are the dreaded
An internal error occurred during: “Items filtering”.
Class file name must end with .class
message box.
How to delete the search index:
- Close Eclipse
- Delete <workspace>/.metadata/.plugins/org.eclipse.jdt.core/*.index
- Delete <workspace>/.metadata/.plugins/org.eclipse.jdt.core/savedIndexNames.txt
- Start Eclipse again