[Java] New Java actor API (#7414)

streaming/java/streaming-runtime/src/main/java/org/ray/streaming/runtime/python/PythonGateway.java

@@ -6,7 +6,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.stream.Collectors;
 import org.msgpack.core.Preconditions;
-import org.ray.api.annotation.RayRemote;
 import org.ray.streaming.api.context.StreamingContext;
 import org.ray.streaming.python.PythonFunction;
 import org.ray.streaming.python.PythonPartition;
@@ -24,7 +23,6 @@ import org.slf4j.LoggerFactory;
  * `streaming/python/runtime/gateway_client.py`
  */
 @SuppressWarnings("unchecked")
-@RayRemote
 public class PythonGateway {
   private static final Logger LOG = LoggerFactory.getLogger(PythonGateway.class);
   private static final String REFERENCE_ID_PREFIX = "__gateway_reference_id__";

streaming/java/streaming-runtime/src/main/java/org/ray/streaming/runtime/schedule/JobSchedulerImpl.java

@@ -61,7 +61,7 @@ public class JobSchedulerImpl implements JobScheduler {
         switch (executionNode.getLanguage()) {
           case JAVA:
             RayActor<JobWorker> jobWorker = (RayActor<JobWorker>) worker;
-            waits.add(Ray.call(JobWorker::init, jobWorker,
+            waits.add(jobWorker.call(JobWorker::init,
                 new WorkerContext(taskId, executionGraph, jobConfig)));
             break;
           case PYTHON:

streaming/java/streaming-runtime/src/main/java/org/ray/streaming/runtime/worker/JobWorker.java

@@ -4,7 +4,6 @@ import java.io.Serializable;
 import java.util.Map;
 
 import org.ray.api.Ray;
-import org.ray.api.annotation.RayRemote;
 import org.ray.runtime.RayMultiWorkerNativeRuntime;
 import org.ray.runtime.functionmanager.JavaFunctionDescriptor;
 import org.ray.streaming.runtime.core.graph.ExecutionGraph;
@@ -28,7 +27,6 @@ import org.slf4j.LoggerFactory;
 /**
  * The stream job worker, it is a ray actor.
  */
-@RayRemote
 public class JobWorker implements Serializable {
   private static final Logger LOGGER = LoggerFactory.getLogger(JobWorker.class);