Question

lets say Thread-1 synchronizes on object

synchronize(object){
  //statement1
  //statement2
  //statement3
}

what happens to the lock on object if Thread-1 crashes on statement2, will JVM release the lock on Thread-1 automatically when this happens ? because otherwise if Thread-2 is wating for the lock on object to be released and Thread-1 crashes, the Thread-2 will wait forever.

Answer 1

It is defined in the JLS #14.19:

synchronized ( Expression ) Block

If execution of the Block completes abruptly for any reason, then the monitor is unlocked and the synchronized statement completes abruptly for the same reason.