How to convert ArrayList of custom class to JsonArray in Java?

Question

I am trying to convert ArrayList of custom class to JsonArray. Below is my code. It executes fine but some JsonArray elements come as zeros even though they are numbers in the A

Answer 1

List<> is a normal java object, and can be successfully transformed using standard gson object api. List in gson looks like this:

"libraries": [
    {
      //Containing object 
    },
    {
      //Containing object 
    }
   ],
...