Can you assign unique thread ids and access thread from external program?

I am currently implementing a program that requires me to handle threads and process.

IDEA:

1. There are multiple java processes running and each process may have multiple threads. Current java implementation is such that thread ids in java is unique for a particular process but not within the processes. So is there a way I could implement a unique thread ids among multiple processes?

2.Also, I need to implement an external java program that monitors these threads. By monitoring I mean, depending upon some logic I need to notify a particular thread(using unique thread id) regarding an event. Is there a way that I can access thread from external program. If yes how?

3) Can I use ThreadGroup for this? How does this work?

Are there any other solutions to implement the similar idea?

Thank you in advance.

Yes, I expect you could do something like that with a suitable JMX monitoring design. Particularly your question (2).

Hey thats great. But I still have a question that whether I will be getting the thread info of all the processes?
For eg:

Suppose there are two processes A, B and each process has three threads 1,2,3.
So using JMX will that be possible to get information about A:1, A:2, A:3 and B:1, B:2, B:3?

As long as the data is available to Java code it is available to JMX (which of course is just Java code itself).

What I mean to say is that can I get all process and thread information at once?
Like is it possible for me to access any process any thread?

What part of my previous answer did you not understand?