core.global.unregisterScope();
    public void exitContext() {        context.removeThreadLocal("reval");        context.removeThreadLocal("engine");        Context.exit();        core.global.unregisterScope();        thread = null;        // if visual debugger is on let it know we're exiting a context        if (core.debugger != null) {            core.debugger.contextExited(context);            core.debugger.contextReleased(context);        }        // loop through previous globals and unset them, if necessary.        if (lastGlobals != null) {           for (Iterator i=lastGlobals.keySet().iterator(); i.hasNext(); ) {               String g = (String) i.next ();               try {                   global.delete (g);               } catch (Exception x) {                   System.err.println ("Error resetting global property: "+g);               }           }           lastGlobals = null;           }    }