Making a plugin backward compatible

Hi
I have developed a plugin using java 1.5. It is a set of preference pages with lot of UIs. I am using SWT and preference store extensively. My client wants me to make it compatible with java 1.4 . How can I do this. What all changes will be required to be made.

They can be two types of changes:
1) Remove all language extensions introduced in 1.5, like generics, for-each loops etc.
You can compile it with 1.4 compatibility. That way, you get compiler errors for everything that is not compatible with 1.4 syntactic and semantic wise. Calling javac directly would then look like this:
javac -source 1.4 [FILES]2) Compile it with an 1.4 compiler to see if you're using 1.5 specific classes and methods. In every Java version, new ones are added, and you might use some of them. You cannot check this with step 1, you really have to use a 1.4 compiler.
3) If you're through the previous steps, make sure you test your plugin thoroughly just to make sure nothing got broken

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Making a plugin backward compatible

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