Bug 6579 Packages view: can't open MANIFEST.MF of JAR file
1. Drill into a JAR with a manifest file (MANIFEST.MF) in the Packages view. Note: The JAR must be on the build path. 2. Double-click MANIFEST.MF -> nothing happens 3. From the context menu select "Open" -> nothing happens I used ant.jar in org.eclipse.ant.core as my test case.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/EditorUtility.java
/** 
	 * Returns the working copy of the given java element.
	 * @param javaElement the javaElement for which the working copyshould be found
	 * @param reconcile indicates whether the working copy must be reconcile prior to searching it
	 * @return the working copy of the given element or <code>null</code> if none
	 */	
	public static IJavaElement getWorkingCopy(IJavaElement element, boolean reconcile) throws JavaModelException {
		ICompilationUnit unit= getCompilationUnit(element);
		if (unit == null)
			return null;
			
		if (unit.isWorkingCopy())
			return element;
			
		ICompilationUnit workingCopy= getWorkingCopy(unit);
		if (workingCopy != null) {
			if (reconcile) {
				synchronized (workingCopy) {
					workingCopy.reconcile();
					return JavaModelUtil.findInCompilationUnit(workingCopy, element);
				}
			} else {
					return JavaModelUtil.findInCompilationUnit(workingCopy, element);
			}
		}
		
		return null;
	}
	/**
	 * Maps the localized modifier name to a code in the same