What is an object's lock and which object's have locks?

Question

I have synchronized some local objects when I try make them remote my application hangs? What could be the problem?

Answer 1

An object's lock is a mechanism that is used by multiple threads to obtain synchronized access to the object. A thread may execute a synchronized method of an object only after it has acquired the object's lock. All objects and classes have locks. A class's lock is acquired on the class's Class object.