[Java Worker] Support raylet on Java (#2479)

java/runtime-dev/pom.xml

@@ -1,5 +1,4 @@
 <?xml version="1.0" encoding="UTF-8"?>
-
 <project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xmlns="http://maven.apache.org/POM/4.0.0"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

java/runtime-dev/src/main/java/org/ray/spi/impl/MockLocalScheduler.java

@@ -1,5 +1,6 @@
 package org.ray.spi.impl;
 
+import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import org.ray.api.UniqueID;
@@ -74,7 +75,12 @@ public class MockLocalScheduler implements LocalSchedulerLink {
   }
 
   @Override
-  public void reconstructObject(UniqueID objectId) {
+  public void reconstructObject(UniqueID objectId, boolean fetchOnly) {
+
+  }
+
+  @Override
+  public void reconstructObjects(List<UniqueID> objectIds, boolean fetchOnly) {
 
   }
 
@@ -82,4 +88,9 @@ public class MockLocalScheduler implements LocalSchedulerLink {
   public void notifyUnblocked() {
 
   }
+
+  @Override
+  public List<byte[]> wait(byte[][] objectIds, int timeoutMs, int numReturns) {
+    return store.wait(objectIds, timeoutMs, numReturns);
+  }
 }