Retroweaver is a tool, which converts Java 5 (or 6) compliant class files into Java 1.x compliant class files. The jar file retroweaver-rt.jar contains the runtime classes only. To run the class processor, you need the jar file retroweaver.jar.
Homepage POM file JAR file Javadoc'net.sourceforge.retroweaver:retroweaver-rt:2.0.2'