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Q: 

how to make compatibility between two parties working on different jdk versions

My project is build in 1.4.2 JDK. Now it is going to interact with a third party jar, build in JDK 1.6

I am getting compatibility problem while using client classes. Is it possible to resolve it without upgrading my JDK to 1.6 or rebuilding third party jar in 1.4.2

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