Enable redis password in Java worker (#3943)

* Support Java redis password

* Fix

* Refine

* Fix lint.

java/test/src/main/java/org/ray/api/test/BaseTest.java

@@ -11,6 +11,7 @@ public class BaseTest {
   public void setUp() {
     System.setProperty("ray.home", "../..");
     System.setProperty("ray.resources", "CPU:4,RES-A:4");
+    beforeInitRay();
     Ray.init();
   }
 
@@ -20,6 +21,7 @@ public class BaseTest {
     // We could not enable this until `systemInfo` enabled.
     //File rayletSocketFIle = new File(Ray.systemInfo().rayletSocketName());
     Ray.shutdown();
+    afterShutdownRay();
 
     //remove raylet socket file
     //rayletSocketFIle.delete();
@@ -29,4 +31,11 @@ public class BaseTest {
     System.clearProperty("ray.resources");
   }
 
+  protected void beforeInitRay() {
+
+  }
+
+  protected void afterShutdownRay() {
+
+  }
 }

java/test/src/main/java/org/ray/api/test/RedisPasswordTest.java

@@ -0,0 +1,34 @@
+package org.ray.api.test;
+
+import org.ray.api.Ray;
+import org.ray.api.RayObject;
+import org.ray.api.annotation.RayRemote;
+import org.testng.Assert;
+import org.testng.annotations.Test;
+
+public class RedisPasswordTest extends BaseTest {
+
+  @Override
+  public void beforeInitRay() {
+    System.setProperty("ray.redis.head-password", "12345678");
+    System.setProperty("ray.redis.password", "12345678");
+  }
+
+  @Override
+  public void afterShutdownRay() {
+    System.clearProperty("ray.redis.head-password");
+    System.clearProperty("ray.redis.password");
+  }
+
+  @RayRemote
+  public static String echo(String str) {
+    return str;
+  }
+
+  @Test
+  public void testRedisPassword() {
+    RayObject<String> obj = Ray.call(RedisPasswordTest::echo, "hello");
+    Assert.assertEquals("hello", obj.get());
+  }
+
+}