We had to more to get JSoup working in our project  for AEM 6.3 -- alot more.  Here is an extract from our pom.xml(It may not be complete, notice we had to pull down the libraries manually to make things work.):<properties>   ...   <system.dependencies>${project.basedir}/lib</system.dependencies></p...

I think the problem is the Servlet API version.   The oracle doc starts "Servlet 3.0 supports".  I think the interface that is being pulled in is an earlier version of the Servlet API.  I don't know if the AEM uber jar has Servlet 3.x apis.The Adobe repo does not have Servlet API 3.0 . Here is the l...