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For that version of JCOP tools you will be developing against JC 2.2.1 and need to set your Java compiler settings in Eclipse to 1.3 for that project. For JCWDE you will be targeting JC 2.2.2 so you can use 1.5 as the compiler version. The JDK version has nothing to do with this so you do not need a different JDK. Eclipse has its own built in compiler.