Github user klopfdreh commented on the issue:
https://github.com/apache/wicket/pull/194
Summary before integration:
* json.org is replaced with open-json, now
* Method calls not supported by open-json throw a WicketRuntimeException to
inform the user
* If users still need json.org they have to reorganize imports and add the
json.org dependency in maven (beware of the license issues in this case!!)
* All classes are preserved due to clirr checks, but are converted to
dummies if there is no functionality left
* There has been a special change to JSONObject, because Objects.hashCode
is only available since jdk > 7
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