Problem description
I installed Eclipse 4.2 Java on Ubuntu 12.04 x86_64 and it just crashes each time the auto completion context menu is opened. It crashes without any error message and just closes the Eclipse window. Interestingly, it also crashes when I click on one of the menu points in Edit->Content Assist AND it crashes when I click in the Window->Preferences on the menu point General->Web Browser. (I experienced that because I wanted to switch off auto completion.)
Finally, I turned off auto completion but the error, as described above, is just less frequently and randomly. At each crash, it just closes the window without any error message every 5 minutes. That's absolutely unacceptable.
Question
Does anybody have a clue what's wrong? I can provide any information you need, just let me know what you need. I can also perform steps that might seem promising to you and report the results.
Additional Information
I have tried different versions of Java JDK, e.g. openjdk-6-jdk, openjdk-7-jdk, oracle-6-jdk, oracle-7-jdk, and different versions of eclipse, e.g. eclipse 3.7 (Indigo) and eclipse 4.2 (Juno). Nothing worked out, but maybe I did it wrong because I had to install Oracle JDK's manually.
$ java -version
java version "1.7.0_15"
OpenJDK Runtime Environment (IcedTea7 2.3.7) (7u15-2.3.7-0ubuntu1~12.04.1)
OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode)
$ javac -version
javac 1.7.0_15
