Configure the default Java in Ubuntu

sudo update-alternatives --config java

To work around JVM 64 bug causing Eclipse crash

Add
-XX:CompileCommand=exclude,org/eclipse/core/internal/dtree/DataTreeNode,forwardDeltaWith
to eclipse.ini

The above option did not work.
Try delete it and add
-Xint
So far so good.

Other cue:
Try to use JDK 5 to run eclipse and use JDK 6 to develop
Disable automatic compiling