Problem: On Ubuntu, Eclipse freezes randomly
Analysis: Eclipse is always loaded using GIJ despite having sun-java-6 set up
Solution: Add sun-java-6 JVM path to /etc/eclipse/java_home

Open the terminal and type this:
# sudo gedit /etc/eclipse/java_home

Add the line “/usr/lib/jvm/java-6-sun” on top of the list
Save and Exit
Restart Eclipse