Remove all occurrences of File.deleteOnExit()

Do not use deleteOnExit() even if you explicitly delete it later.

Google 'deleteonexit is evil' for more info, but the gist of the problem is:

deleteOnExit() only deletes for normal JVM shutdowns, not crashes or killing the JVM process.

deleteOnExit() only deletes on JVM shutdown - not good for long running server processes because:

The most evil of all - deleteOnExit() consumes memory for each temp file entry. If your process is running for months, or creates a lot of temp files in a short time, you consume memory and never release it until the JVM shuts down.