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This seems unrelated to the other bug (39174). Using build I20030528, I tried to open AppearanceAwareLabelProvider by highlighting its name in the extends clause of a subclass and selection "Open Type Hierarchy" from the context menu. The view contained some other hierarchy at that time. A NullPointerException was thrown (see attached log) and the view was reset to its "no hierarchy shown" state. When I tried opening the hierarchy for the same type in the same way right after that, it worked fine - so I cannot reproduce this bug.
Created attachment 5264 [details] Exception log file
NPE is thrown in org.eclipse.jdt.internal.compiler.parser.SourceTypeConverter.convert (SourceTypeConverter.java:117) Moving to JDT/Core.
*** This bug has been marked as a duplicate of 36854 ***