Enable including Java worker for ray start command (#3838)

java/runtime/pom.xml

@@ -77,4 +77,38 @@
       <scope>test</scope>
     </dependency>
   </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-dependency-plugin</artifactId>
+        <executions>
+          <execution>
+            <id>copy-dependencies-to-build</id>
+            <phase>package</phase>
+            <goals>
+              <goal>copy-dependencies</goal>
+            </goals>
+            <configuration>
+              <outputDirectory>${basedir}/../../build/java</outputDirectory>
+              <overWriteReleases>false</overWriteReleases>
+              <overWriteSnapshots>false</overWriteSnapshots>
+              <overWriteIfNewer>true</overWriteIfNewer>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <version>2.3.1</version>
+        <configuration>
+          <outputDirectory>${basedir}/../../build/java</outputDirectory>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+
 </project>

java/runtime/src/main/java/org/ray/runtime/RayNativeRuntime.java

@@ -71,6 +71,7 @@ public final class RayNativeRuntime extends AbstractRayRuntime {
     }
     redisClient = new RedisClient(rayConfig.getRedisAddress());
 
+    // TODO(qwang): Get object_store_socket_name and raylet_socket_name from Redis.
     objectStoreProxy = new ObjectStoreProxy(this, rayConfig.objectStoreSocketName);
 
     rayletClient = new RayletClientImpl(