code: public static final void entry(TraceComponent tc, String methodName, Object obj) {
      entry(null, tc, methodName, obj);
    }
docs: If entry level diagnostic trace is enabled for the specified
  <code>TraceComponent</code>, forward an Entry event to all registered
  TraceEventListeners. Each registered listener will determine whether to
  log or ignore the event.
  <p>
  @param tc the non-null <code>TraceComponent</code> the event is associated
  with.
  @param methodName the name of the method being entered.
  @param obj an <code>Object</code> or array of <code>Objects</code>.
  toString() is called on each object and the results are appended to
  the methodName.