code: public void printStackTrace(java.io.PrintStream s) {
          if (ex == null)
              super.printStackTrace(s);
          else {
              synchronized (s) {
                  s.print(split(getClass().getName()) + ": ");
                  ex.printStackTrace(s);
              }
          }
      }
docs: here we prefix, with s.print(), not s.println(), the stack
  trace with "ExceptionConverter:"
  @param s a printstream object