These states are the same as mentioned in the Thread.State enum. “Wait” means, as the documentation says:
A thread is in the waiting state due to calling one of the following methods:
- Object.wait with no timeout
- Thread.join with no timeout
- LockSupport.park
“Monitor” is the BLOCKED state, in which the thread is waiting to obtain a lock on an object (because it’s trying to enter a synchronized block or method while another thread already holds the associated lock).