JSON Serialization of Process Variables with old delegate beans

[cgeorgilakis]

Firstly , I want to know the pros of JSON Serialization comparing to Java Serialization. JSON Serialization has better performance than Java Serialization?

I refer to version 7 Core beta5. I try to use JSON Serialization with our migrated from Activit 6 project. Unfortunately, all variables that are set in delegate beans are saved with Java Serialization. If we want to use ( or test) JSON Serialization we must first migrate all our delegate beans to new Connectors?

Finally, after stable version will be available migration guide from Activiti 6 to Activiti 7 core?