From 0bab36874048ed17e1991b73ad3238381a3a4214 Mon Sep 17 00:00:00 2001
From: hekrxe <hekrxe@163.com>
Date: Thu, 21 Feb 2019 19:06:08 +0800
Subject: [PATCH] fix issue #3533

---
 .../dubbo/configcenter/support/zookeeper/CacheListener.java  | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/dubbo-configcenter/dubbo-configcenter-zookeeper/src/main/java/org/apache/dubbo/configcenter/support/zookeeper/CacheListener.java b/dubbo-configcenter/dubbo-configcenter-zookeeper/src/main/java/org/apache/dubbo/configcenter/support/zookeeper/CacheListener.java
index a1e1f083523..1851a22b2f0 100644
--- a/dubbo-configcenter/dubbo-configcenter-zookeeper/src/main/java/org/apache/dubbo/configcenter/support/zookeeper/CacheListener.java
+++ b/dubbo-configcenter/dubbo-configcenter-zookeeper/src/main/java/org/apache/dubbo/configcenter/support/zookeeper/CacheListener.java
@@ -38,6 +38,8 @@
  *
  */
 public class CacheListener implements TreeCacheListener {
+    private static final byte[] EMPTY_BYTES = new byte[0];
+
     private Map<String, Set<ConfigurationListener>> keyListeners = new ConcurrentHashMap<>();
     private CountDownLatch initializedLatch;
     private String rootPath;
@@ -83,6 +85,9 @@ public void childEvent(CuratorFramework aClient, TreeCacheEvent event) throws Ex
                     return;
             }
 
+            if (value == null) {
+                value = EMPTY_BYTES;
+            }
             ConfigChangeEvent configChangeEvent = new ConfigChangeEvent(key, new String(value, StandardCharsets.UTF_8), changeType);
             Set<ConfigurationListener> listeners = keyListeners.get(key);
             if (CollectionUtils.isNotEmpty(listeners)) {