From 34a4922d2401fb60e8f4c9f1c0459a79ff49a20a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=B5=B5=E5=BB=B6?= <1060026287@qq.com>
Date: Sun, 11 Jul 2021 21:26:41 +0800
Subject: [PATCH] for compatible nacos server lower version, we should check
 the response from nacos server is null. (#8229)

---
 .../support/nacos/NacosDynamicConfiguration.java       | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/dubbo-configcenter/dubbo-configcenter-nacos/src/main/java/org/apache/dubbo/configcenter/support/nacos/NacosDynamicConfiguration.java b/dubbo-configcenter/dubbo-configcenter-nacos/src/main/java/org/apache/dubbo/configcenter/support/nacos/NacosDynamicConfiguration.java
index a801e4ec1f9..5356b9da8b9 100644
--- a/dubbo-configcenter/dubbo-configcenter-nacos/src/main/java/org/apache/dubbo/configcenter/support/nacos/NacosDynamicConfiguration.java
+++ b/dubbo-configcenter/dubbo-configcenter-nacos/src/main/java/org/apache/dubbo/configcenter/support/nacos/NacosDynamicConfiguration.java
@@ -260,7 +260,9 @@ public SortedSet<String> getConfigKeys(String group) {
 
             HttpRestResult<String> result = httpAgent.httpGet(GET_CONFIG_KEYS_PATH, emptyMap(), paramsValues, encoding, 5 * 1000);
             Stream<String> keysStream = toKeysStream(result.getData());
-            keysStream.forEach(keys::add);
+            if (keysStream != null) {
+                keysStream.forEach(keys::add);
+            }
         } catch (Exception e) {
             if (logger.isErrorEnabled()) {
                 logger.error(e.getMessage(), e);
@@ -284,7 +286,13 @@ public boolean removeConfig(String key, String group) {
 
     private Stream<String> toKeysStream(String content) {
         JSONObject jsonObject = JSON.parseObject(content);
+        if (jsonObject == null) {
+            return null;
+        }
         JSONArray pageItems = jsonObject.getJSONArray("pageItems");
+        if (pageItems == null) {
+            return null;
+        }
         return pageItems.stream()
                 .map(object -> (JSONObject) object)
                 .map(json -> json.getString("dataId"));