If you are migrating from IBM WebSphere Application Server V6.1, V7.0, or V8.0 Feature Pack for Web 2.0 and Mobile to WebSphere Application Server Version 8.5, there are a few things to consider:
JSON4J is not installed with the Web 2.0 and Mobile Toolkit. JSON4J is now part of the application server runtime. You no longer need to created a JSON4J shared library or embed the JSON4J library in your web application to use JSON4J.
When migrating a previous JSON4J enabled application, you should remove the JSON4J library from your web application's WEB-INF/lib utility directory. You should also skip any steps that require creating shared library references when deploying your application.