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Hi
When I say that a thread has obtained a lock on the monitor of an Object. What happens internally ?
 
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Do you mean how is it implemented? If you go through the Java® Language Specification I think you will find that is not specified. Nor does the Virtual Machine Specification (try §2.11 and §3.14) give anything definite.

Obviously each object has a monitor which is probably implemented by changing a bit in it from 0 to 1 and vice versa, but for more details you will have to download something like OpenJDK and go through its source code.
 
Consider Paul's rocket mass heater.
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