The following shortcuts are on Ubuntu Feisty
Create a shortcut with the path as follows
/usr/bin/eclipse -vm /usr/lib/jvm/java-6-sun-1.6.0.00/jre/bin/java
or in the eclipse.ini file add the following
-vm
/usr/lib/jvm/java-6-sun-1.6.0.00/jre/bin/java