This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
According to the Oracle jar documentation, jar can pass JVM options with a -J option after the files list. However, when I try this, jar seems to interpret it as a file in the list and returns no such file or directory.