From 349802604c97d71f2b2fa804d3e1bc2a3d9b3943 Mon Sep 17 00:00:00 2001
From: ascrutae <nzt48.xin@gmail.com>
Date: Sun, 10 Sep 2017 11:40:21 +0800
Subject: [PATCH] fix gc issue

---
 .../org/skywalking/apm/agent/core/jvm/gc/GCProvider.java     | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/jvm/gc/GCProvider.java b/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/jvm/gc/GCProvider.java
index a72e30e95..2f8aa34b5 100644
--- a/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/jvm/gc/GCProvider.java
+++ b/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/jvm/gc/GCProvider.java
@@ -24,7 +24,10 @@ public enum GCProvider {
                 break;
             }
         }
-        this.metricAccessor = new UnknowGC();
+
+        if (metricAccessor == null) {
+            this.metricAccessor = new UnknowGC();
+        }
     }
 
     public List<GC> getGCList() {