JWt depends on commons-fileupload-1.2.2.jar, which is licensed under the
Apache license 2.0: http://svn.apache.org/viewvc/commons/proper/fileupload/trunk/LICENSE.txt?view=markup
You state that JWt is available under the GPLv2, but not GPLv3:
"Wt is licensed under the GNU GPL Version 2. Other versions of the GPL do not apply"
The GPLv2 is, however, not considered to be compatible with the Apache License 2.0:
I would recommend that you change the open source license of JWt to GPLv3 instead of GPLv2.
Updated by Bernhard Fastenrath about 9 years ago
For my own JWT-based project I did select the http://en.wikipedia.org/wiki/Affero_General_Public_License.
The reason was that this was no inconvenience for my true open source customers and at the same time didn't allow commercial users to "circumvent" the GPL by not actually distributing the project to anybody.