The previous release of JTella v. 0.9, which was corrupt (in fact did not contain class files) has been replaced by the currently available file, which is now usable and correct.
It seems that version 2.0 of the filesharing application Morpheus (http://www.morpheus.com/) is using the JTella library and is not giving proper credit according the LGPL. For more information see the Zeropaid article.
JTella is the Java API for the GNUTella network. Using JTella, Java based GNUTella tools and servants can be created, with JTella providing the network interface code.
The 0.7 release of Jtella is finally up on SourceForge. Download it now and let us know what you think.