Problem: you get an error during build saying “Build error java.util.Enumeration cannot be resolved” even though you have the correct import statement.
Solution: Set the compiler compliance level to 1.4 (window->preferences->Java->compiler) and rebuild.

Environment specific configuration of Java applications usually require changes to properties files before the application can be deployed. We discuss here how this can be achieved using ant tasks.

Problem: The error “project .jetemitters is missing required library” prevents you from building your project.
Solution: Go to package explorer window and click the down arrow button in the right hand corner.

Then select filter and uncheck *.resources. The project .jetemitters should now show up. Just delete it.