Proxy interfaces allow to mimic guest language objects in Graal languages.
ProxyObjectinterface and then pass the object to a guest language. The guest language will then treat this instance as an object. For instance if the language tries to write into a field it will call
ProxyObject.putMember(String, org.graalvm.polyglot.Value). The API is designed to be language agnostic, therefore they it can be used with any Graal guest language.
See graalvm.org for more examples on how to use this API.
for more an overview over all available proxy interfaces.