Review

Synchronizes on an object and then again on the same object within the synchroized bock, thereby, producing a deadlock.

synchronize only once.

• superfluous/condition/synchronization

mubench/examples/directives/Deadlock.java

misuse(Object)

class Deadlock {
	public void misuse(Object o) {
		synchronized (o) {
			o.hashCode();
			synchronized (o) {
				o.hashCode();
			}
		}
	}

}

public class Synchronized {
	public void pattern(Object o) {
		synchronized (o) {
			o.hashCode();
			o.hashCode();
		}
	}
}