JDK 7 Twice as Fast as JDK 6 for Arrays and Arithmetic. Should see this after the final Java7 release http://geeknizer.com/java-7-whats-new-performance-benchmark-1-5-1-6-1-7/
According to the forum http://jwork.org/jhepwork/forum/viewtopic.php?id=13 just released Java7 has a bug on Linux platform. It seems like execution of the code for jhplot canvases compiled using jdk6 fails. This bug is perfectly reproducible on the Linux (Ubuntu, Fedora) and related to the graphics package org.freehep.graphics2d.VectorGraphics. Interestingly enough, Jdk7 on windows is fine. This bug was sent to the java7 developers, but they could not reproduce it.
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