I am not knowledgable with Linux. However, LW will generally use the latest Java installed for Windows users. For some users, LW does not behave well with Java 1.6 so backdating to Java 1.5_10 or _11 does the trick. Also, not sure about now but originally Java 1.6 would not work properly if other versions of Java were still on the system. (for windows 1.5_10 seemed to be better.)
Sort out which Java you think you should be using first.
Then try deleting LW's preference folder whilst LW is closed; found here for Linux: ~/.limewire OR for the newer versions it may be called limewire: ~/limewire