[xlang] Cross language serialize ActorHandle (#7134)

java/test/src/main/resources/test_cross_language_invocation.py

@@ -31,6 +31,31 @@ def py_func_call_java_actor(value):
     return ray.get(r)
 
 
+@ray.remote
+def py_func_call_java_actor_from_handle(value):
+    assert isinstance(value, bytes)
+    actor_handle = ray.actor.ActorHandle._deserialization_helper(value, False)
+    r = actor_handle.concat.remote(b"2")
+    return ray.get(r)
+
+
+@ray.remote
+def py_func_call_python_actor_from_handle(value):
+    assert isinstance(value, bytes)
+    actor_handle = ray.actor.ActorHandle._deserialization_helper(value, False)
+    r = actor_handle.increase.remote(2)
+    return ray.get(r)
+
+
+@ray.remote
+def py_func_pass_python_actor_handle():
+    counter = Counter.remote(2)
+    f = ray.java_function("org.ray.api.test.CrossLanguageInvocationTest",
+                          "callPythonActorHandle")
+    r = f.remote(counter._serialization_helper(False))
+    return ray.get(r)
+
+
 @ray.remote
 class Counter(object):
     def __init__(self, value):