Just read a really cool explanation on Ted Neward's weblog about how to use the JRockit JVM. Just follow this: 1. Download JRockit Installer and run it 2. It will install a number of files, you only need 2 of them! 3. In the JRockit install folder (where you installed it) It is probably in the following configuration: JRockit->7.0->1.4.0->jre->bin->jrockit Whatever your config is, the ONLY folder you need is the "jrockit" one inside jre/bin. You can delete the rest if you want. 4. Copy that "jrockit" folder (it should have only two files in it: "jvm.dll" and "Xusage.txt") into your Sun JRE/JDK install's "bin" folder. So now you should have: <Sun_JRE_Install>/bin/jrockit 5. Find the jvm.cfg file (for intel computers it's in "lib/i386" and add the line:
-jrockit KNOWN 6. Find a Java program you wrote (e.g. HelloWorld) and type: java -jrockit HelloWorld That's it!! Pretty cool, huh? All you needed was two files (only equalling about 1.8 megs in size) and one small file change.