Thread Join on Itself

java - Thread join on itself - Stack Overflow

The concept of a thread joining itself does not make sense.

It happens out that the join() method uses the isAlive() method to determine when to return from thejoin() method. In the current implementation, it also does not check to see if the thread is joining itself.
In other words, the join() method returns when and only when the thread is no longer alive. This will have the effect of waiting forever.

 

I saw this in Helix:

public void run()
{
  LockProcess lockProcess = null;

  try
  {
    lockProcess = new LockProcess(clusterName, ZK_ADDRESS,
        instanceName, startController);
    lockProcess.start();
   Thread.currentThread().join();
  } catch (InterruptedException e)
  {
    System.out.println(instanceName + "Interrupted");
    if (lockProcess != null)
    {
      lockProcess.stop();
    }
  } catch (Exception e)
  {
    e.printStackTrace();
  }
}