Just tested it with the OpenJDK installed from Applications->Add/Remove...
Can't really see any problems with it at the moment. It might have a few user-interface issues in the preferences dialog, but they seem to all be app-related, not java/ubuntu. There is a "Software Updates" option available from the File menu that might need to be looked at if this is installed from an Ubuntu package.
Just tested it with the OpenJDK installed from Applications- >Add/Remove. ..
Can't really see any problems with it at the moment. It might have a few user-interface issues in the preferences dialog, but they seem to all be app-related, not java/ubuntu. There is a "Software Updates" option available from the File menu that might need to be looked at if this is installed from an Ubuntu package.