code: public synchronized boolean stillMyValues() throws IOException, FileNotFoundException {
          for (;;) {
              try {
                  lock();
                  getValues();
                  unlock();
                  if (containsPortInfo) {
                      if (serverPort == myServerPort &&
                          serverCookie == myServerCookie) {
                          // Everything is ok.
                          return true;
                      }
                      // Someone has overwritten the port file.
                      // Probably another javac server, lets quit.
                      return false;
                  }
                  // Something else is wrong with the portfile. Lets quit.
                  return false;
              } catch (FileLockInterruptionException e) {
                  continue;
              }
              catch (ClosedChannelException e) {
                  // The channel has been closed since sjavac is exiting.
                  return false;
              }
          }
      }
docs: Check if the portfile still contains my values, assuming that I am the server.