Delete the org.json packages directly from the maven repository, run a test in offline mode. See which library it's moaning about and make sure it's the right one.

Update Json JAR to "json-20141113.jar" and its all OK.

データベース接続時に発生するエラー「java.lang.NoClassDefFoundError」の対処について Symfoware Server (Native Interface)のよくあるご質問 を検索できます。