eclipse IDE run error read /.metadata/.log - eclipse

Question

Pre: Ubuntu, installed Eclipse in this way:
tar -zxvf eclipse.XX.YY.tar.gz
mv eclipse.XX.YY ~/opt
sudo nano /usr/share/applications/eclipse.desktop
[Desktop Entry]
Name=Eclipse
Type=Application
Exec=/home/user/opt/eclipse/eclipse #watch the directory!
Terminal=false
Icon=/home/usr/opt/eclipse/icon.xpm
Comment=Integrated Development Environment
NoDisplay=false
Categories=Development;IDE
Name[en]=eclipse.desktop
cd /usr/local/bin
ln -s /opt/eclipse/eclipse
after that (I had a workspace before) running eclipse throws an error to read workspace/.metadata/.log
Some people suggest to Delete: /YOUR PATH TO WORKSPACE/.metadata/.plugins/org.eclipse.core.resources
like here
http://bugsanddebugs.blogspot.com/2010/06/when-eclipse-says-error-has-occurred.html
but running
eclipse -clean
gives the same error.
This almost exhaustive article helped a little...
http://www.eclipsezone.com/eclipse/forums/t99010.html
but still can't understand errors:
~/workspace$ egrep -A 2 "Caused by" ~/workspace/.metadata/.log
Caused by: org.osgi.framework.BundleException: Exception in org.eclipse.equinox.console.command.adapter.Activator.start() of bundle org.eclipse.equinox.console.
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:734)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:683)
--
Caused by: org.osgi.framework.BundleException: Exception in org.apache.felix.gogo.command.Activator.start() of bundle org.apache.felix.gogo.command.
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:734)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:683)
--
Caused by: java.lang.NoClassDefFoundError: org.apache.felix.gogo.command.OBR
at java.lang.Class.initializeClass(libgcj.so.12)
at org.apache.felix.gogo.command.Activator.start(Activator.java:54)
--
Caused by: java.lang.ClassNotFoundException: org.apache.felix.bundlerepository.Repository
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:501)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
--
Caused by: java.lang.ClassNotFoundException: org.apache.felix.bundlerepository.Repository
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:501)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
how to read all this?

Answer 1

Try to copy JRE folder to the Eclipse folder. It may fix the problem. It works for me anyway.
The reason why the Eclipse won't start is that it started with an old version of the JVM.
See this reference for more details: eclipse won't start .