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I have a client jar made-up using java 1.6 and used enum and other new features of java, my application is built on java 1.4.
I want to use that client jar in my application.
Is it feasible to do ?
Normally: no, you can’t.
You could use a library/byte-code rewriter like Retroweaver to rewrite the library to be 1.4 compatible. There’s also Retrotranslator which does the same thing and other tools. The last time I used Retroweaver was just after Java 5 was released, so I can’t talk about it’s current state.
But that will be a hack at best. Using an ancient Java version is a liability at best and you should upgrade to at the very least Java 5 as soon as possible.