code: void dropPidOrDie() {
          if (!dropPidFile()) {
              LOG.error("Pid file {} already exists... exiting.", pidFilename);
  
              // print to the console as well
              System.err.println("Pid file already exists... exiting.");
              System.err.flush();
              System.exit(-1);
          }
      }
docs: Wrapper around {@link #dropPidFile()}. If the call is unsuccessful, terminate the JVM.