code: public static void setDebugMode(boolean b) {
          debugMode = Boolean.valueOf( b );
          if (debugMode) {
              if (!MVELRuntime.hasDebuggerContext()) {
                  MVELRuntime.setThreadDebugger(new MVELDebugger());
              }
          } else {
              MVELRuntime.resetDebugger();
          }
          System.setProperty( DEBUG_LAUNCH_KEY, debugMode.toString());
      }
docs: Sets debug mode on/off.<br/>
  Updates local MVELDebugHandler property and System property "mvel.debugger"<br/>
  <br/>
  There's no need to ever call this method unless you write junit tests!<br/>
  
  @param b is Debug enabled?