前：Ubuntu，安装Eclipse的方式：

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

之后（我之前有一个工作区）运行eclipse会抛出一个错误来读取workspace/.metadata/.log有些人建议删除：/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)

怎么读这些？