From 9d4847ad2dfa013cb87ef68fa2cda82747b5f715 Mon Sep 17 00:00:00 2001
From: Wang Qing <kingchin1218@126.com>
Date: Wed, 14 Nov 2018 10:21:54 +0800
Subject: [PATCH] [hot-fix] Fix error when calling Ray.init() twice. (#3314)

---
 java/api/src/main/java/org/ray/api/Ray.java | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/java/api/src/main/java/org/ray/api/Ray.java b/java/api/src/main/java/org/ray/api/Ray.java
index 053f01d55..7e252274e 100644
--- a/java/api/src/main/java/org/ray/api/Ray.java
+++ b/java/api/src/main/java/org/ray/api/Ray.java
@@ -41,7 +41,10 @@ public final class Ray extends RayCall {
    * Shutdown Ray runtime.
    */
   public static void shutdown() {
-    runtime.shutdown();
+    if (runtime != null) {
+      runtime.shutdown();
+      runtime = null;
+    }
   }
 
   /**