Eclipse not working after installing java, pydev,

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http://askubuntu.com – I have some problems with running eclipse. First I've installed eclipse and it worked, then I used sudo apt-get ... to install java jdk, jre, pydev, pylucene, numpy, scipy, networkx, matplotlib. All of installations reported successful but when I start eclipse on Ubuntu, it gives me tons of error. Is the java not working properly on Ubuntu? Or are there other problems? !SESSION 2012-09-14 10:45:08.907 eclipse.buildId=I20110613-1736 java.version=1.7.0_07 java.vendor=Oracle Corporation BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_SG Command-line arguments: -os linux -ws gtk - (HowTos)