Bug 19365 ArrayIndexOutOfBounds: editing Build Path .jar
F2 - File -> New -> Project... - Plug-in Development - Plug-in Project -> Next - set name="asd", Next - Next - select Hello World wizard, Next - Finish -> creates new Project "asd" - select it in the Packages view, right-click -> Properties... - go to Java Build Path page - go to contained Libraries tab - select any of the ECLIPSE_HOME... libraries shown in the list - press Edit... - press OK in the subsequent Variable Extension dialog, get the attached exception
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/LibrariesWorkbookPage.java
}
		if (res != null) {
			fLibrariesList.replaceElement(elem, res[0]);
		}		
			
	}
	
	private void libaryPageSelectionChanged(DialogField field) {
		List selElements= fLibrariesList.getSelectedElements();
		fLibrariesList.enableButton(IDX_ATTACH, canDoSourceAttachment(selElements));
		fLibrariesList.enableButton(IDX_EDIT, selElements.size() == 1);
	}
	
	private void libaryPageDialogFieldChanged(DialogField field) {
		if (fCurrJProject != null) {
			
			updateClasspathList();
		}
	}	
	
	private boolean canDoSourceAttachment(List selElements) {
		if (selElements != null && selElements.size() == 1) {
			CPListElement elem= (CPListElement) selElements.get(0);
			if (elem.getEntryKind() == IClasspathEntry.CPE_LIBRARY) {
				return (!(elem.getResource() instanceof IFolder));
			} else if (elem.getEntryKind() == IClasspathEntry.CPE_VARIABLE) {
				return true;
			}
		}
		return false;