Bug 63268 error while activating view
I'm not sure what caused this behaviour. I created a workspace this morning, imported a few projects, and ran the UI Test Suite. However, I got an error when trying to activate the Hierarchy view (by clicking on it). The error looks like an infinite loop. The trace is over 800 lines long, so I'll attach it in a minute.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/typehierarchy/TypeHierarchyViewPart.java
}
		
	/**
	 * Adds the entry if new. Inserted at the beginning of the history entries list.
	 */		
	private void addHistoryEntry(IJavaElement entry) {
		if (fInputHistory.contains(entry)) {
			fInputHistory.remove(entry);
		}
		fInputHistory.add(0, entry);
		fHistoryDropDownAction.setEnabled(true);
	}
	
	private void updateHistoryEntries() {
		for (int i= fInputHistory.size() - 1; i >= 0; i--) {
			IJavaElement type= (IJavaElement) fInputHistory.get(i);
			if (!type.exists()) {
				fInputHistory.remove(i);
			}
		}
		fHistoryDropDownAction.setEnabled(!fInputHistory.isEmpty());
	}
	
	/**
	 * Goes to the selected entry, without updating the order of history entries.
	 */	
	public void gotoHistoryEntry(IJavaElement entry) {
		if (fInputHistory.contains(entry)) {
			updateInput(entry);
		}