Add a field/variable at code generation

[313hemant313]

Using Jprotoc, wanted to check if we can safely add a field at the time of code generation.

Like adding List jsonPojoList, while supporting safe data transfer.

[313hemant313]

@rmichela Can you please guide.

[rmichela]

JProtoc cannot modify the code generated directly by protoc.

You can, however, author a custom code generator that will run alongside protoc's generator and generate any additional source files or classes you'd like.

[313hemant313]

@rmichela Any sample code to do the same ? any reference ?