From f162fccf8b148954dba870b01a4b4de93e4592c7 Mon Sep 17 00:00:00 2001
From: Gao Hongtao <hanahmily@gmail.com>
Date: Thu, 27 Sep 2018 21:12:50 +0800
Subject: [PATCH] Avoid query error by adding initial instance to AlarmTrend
 (#1713)

---
 .../apache/skywalking/oap/query/graphql/type/AlarmTrend.java   | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/oap-server/server-query-plugin/query-graphql-plugin/src/main/java/org/apache/skywalking/oap/query/graphql/type/AlarmTrend.java b/oap-server/server-query-plugin/query-graphql-plugin/src/main/java/org/apache/skywalking/oap/query/graphql/type/AlarmTrend.java
index fcfae7459..a64d10f3c 100644
--- a/oap-server/server-query-plugin/query-graphql-plugin/src/main/java/org/apache/skywalking/oap/query/graphql/type/AlarmTrend.java
+++ b/oap-server/server-query-plugin/query-graphql-plugin/src/main/java/org/apache/skywalking/oap/query/graphql/type/AlarmTrend.java
@@ -18,8 +18,9 @@
 
 package org.apache.skywalking.oap.query.graphql.type;
 
+import java.util.ArrayList;
 import java.util.List;
 
 public class AlarmTrend {
-    private List<Integer> numOfAlarm;
+    private List<Integer> numOfAlarm = new ArrayList<>();
 }