I am on Kubuntu 13.10 and have the same problem. It worked before but today I noticed that eclipse complained about several missing jars.
And I see I miss the "/usr/lib/jvm/java-7-openjdk-common" dir. The jars seem to be in "/usr/lib/jvm/java-7-openjdk-amd64", so a missing symlink ? I did a "sudo ln -s java-7-openjdk-amd64 java-7-openjdk-common" in /usr/lib/jvm and after that things work fine in eclipse again.
I am on Kubuntu 13.10 and have the same problem. It worked before but today I noticed that eclipse complained about several missing jars.
And I see I miss the "/usr/lib/ jvm/java- 7-openjdk- common" dir. The jars seem to be in "/usr/lib/ jvm/java- 7-openjdk- amd64", so a missing symlink ? I did a "sudo ln -s java-7- openjdk- amd64 java-7- openjdk- common" in /usr/lib/jvm and after that things work fine in eclipse again.