Retroweaver is a bytecode weaver that enables you to take advantage of the new Java 1.5 language features, while still retaining total binary compatability with 1.4 virtual machines. Retroweaver operates by transforming Java class files compiled by a 1.5 compiler into version 1.4 class files which can then be run on any 1.4 virtual machine.
So, when your favorite vendor tells you that their application server won't be supporting JDK 1.5 until 2007, or your customers won't have JDK 1.5 for years to come, or your manager refuses to begin development on a beta JDK, put Retroweaver to work for you.
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