The previous implementation of Arguments.generateBundle() called (possibly multiple Bundlers) in a loop, and called bundler.cleanup() after each one.
This was not in a finally block, so the temp directory was never cleaned up when an exception was thrown.

as a result you may fine multiple temp directories left behind. (/tmp/jdk.jpackageXXXXX on windows)

With the new implementation to execute only one bundler, the code:
            if (!userProvidedBuildRoot) {
                bundler.cleanup(localParams);
            }
can be moved into the existing finally block.