How to catch ros topic in java application with Eclipse

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Hello, experts!!

I have some question to catch ros topic in java application with Eclipse.

I want to implement a agent program developed by java and Eclipse.

How can a java agent program catch ROSnode's topic?

Because some ROSnodes make information and a agent program use the information which made by ROSnodes.

I want the agent program to read the topic message directly.

And...how to execute the ros node in Eclipse?

I followed rosjava tutorial but I don't figure out the problems.

let me give some advice or references

Thank you!!!