Eclipse crashes at startup

[Ruben]

I got this log error file:

!SESSION Thu Mar 01 17:51:54 CET 2012 ------------------------------------------
!ENTRY org.eclipse.equinox.launcher 4 0 2012-03-01 17:51:54.142
!MESSAGE Exception launching the Eclipse Platform:
!STACK
java.lang.ClassNotFoundException: org.eclipse.core.runtime.adaptor.EclipseStarter
 at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
 at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:619)
 at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
 at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
 at org.eclipse.equinox.launcher.Main.main(Main.java:1386)

Reinstallation doesn't work, even using:
     sudo apt-get remove --purge eclipse
     sudo apt-get install eclipse

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Angel Guzman Maeso (shakaran)]

I make a workaround removing some packages:

mv .eclipse .eclipse-backup # Save a backup for eclipse config
mv workspace workspace-backup # Save a backup for eclipse workspace
sudo apt-get remove openjdk-6-jre-lib # Remove the lib for java6 (it is supposed that java7 is installed and conflicts)
mv .eclipse-backup .eclipse # Restore the backup for eclipse config
mv workspace-backup workspace # Restore the backup for eclipse workspace

[Teräslilja (m-matti-a-lehtonen)]

This workaround does not work for me.