Github user PhantomYdn commented on the pull request:
https://github.com/apache/wicket/pull/164#issuecomment-217656619
@klopfdreh it has 3 licenses.
```
Javassist version 3.20.0-GA is available (June 25, 2015).
This version is distributed under the triple license of the MPL, the LGPL,
and the Apache License. The distribution includes the jar file, the sources,
some samples, the API manual, and a tutorial. The binary is also available from
the central repo.
```
Source: http://jboss-javassist.github.io/javassist/
So there should no any problems.
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