code: public final void setSourceText(final String text) {
          if (SwingUtilities.isEventDispatchThread()) {
              setSourceTextIntern(text);
          } else {
              try {
                  SwingUtilities.invokeLater(new Runnable() {
                      public void run() {
                          setSourceTextIntern(text);
                      }
                  });
              } catch (final Exception ex) {
                  ignore();
              }
          }
      }
docs: Set the text for the "Source" label. If called outside the EDT this
  method will switch to the UI thread using
  <code>SwingUtilities.invokeLater(Runnable)</code>.
  
  @param text
  Text for the label.