Zonedabone had an answer to this problem earlier in the year, but you have to reactivate jython scripting in Alice to make it work, or at least add the script anyway. He has example worlds to demonstrate, with an explanation of how to turn scripting back on.
I've been toying with using the scripting tool to include Java methods with limited success, but the need will probably disappear when Alice 3.0 gets out of Beta.
Finally got Java script to run, and can access Java Libraries. I also use Eclipse and Netbeans, so having JDK might be required