Hi Dominik, Just to check - you need to close the cmd prompt and open a new one for the environment variable to take effect - unless you used SET on the command line?
For reference my current maven_opts is set to -Xmx1280m -Xms756m Am running 1.5.0_03, but otherwise the same. Ensure you have an easy 800mb free in the TMP path location too. Hope this helps - am leaving the office now, will check how you got on later! Paul Noden.
