Hello, I'm trying to use

PlanResources

(

/api/plan/resources

) api in spring boot project. Just wanna know, is there any library in java which can iterate the AST tree and provide the necessary condition.

Unfortunately not yet. However you can see three examples here in JS and Python. We hope these would make a good example for you to be able to implement your own. https://github.com/cerbos/query-plan-adapters