What is a good GraphQL lib

[PGriffith]

I would look for a Java library that you can run out-of-band on the GraphQL server you're trying to communicate to, generating consuming classes out-of-band, then dump them into a module (preferred) or the lib/ directory of the gateway, as described in this post dealing with Protobuf:

Protobuf data encoding

it's working after getting some guidance from Ignition support team Define the Protobuf schema that describes the structure of the data you want to serialize/deserialize. This schema file (.proto) defines the types and structure of the messages. Generate Java code from the Protobuf schema using a Protobuf compiler (protoc) to generate Java classes from the .proto schema file. The protoc compiler reads the .proto file and outputs Java source files corresponding to the schema. …