From d5348c93dee66adae4230eb88618c007eec768e5 Mon Sep 17 00:00:00 2001
From: Leon Yang <1395305816@qq.com>
Date: Wed, 2 Jun 2021 23:18:31 +0800
Subject: [PATCH] Fix: TraceIgnorePathPatterns can't set empty value (#7059)

---
 CHANGES.md                                                      | 1 +
 .../apm/plugin/trace/ignore/TraceIgnoreExtendService.java       | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/CHANGES.md b/CHANGES.md
index d741d935d..632f88d5a 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -33,6 +33,7 @@ Release Notes.
 * Fix ClassCast issue for RequestHolder/ResponseHolder.
 * fixed `jdk-threading-plugin` memory leak.
 * Optimize multiple field reflection operation in Feign plugin.
+* Fix `trace-ignore-plugin` TraceIgnorePathPatterns can't set empty value
 
 #### OAP-Backend
 * BugFix: filter invalid Envoy access logs whose socket address is empty.
diff --git a/apm-sniffer/optional-plugins/trace-ignore-plugin/src/main/java/org/apache/skywalking/apm/plugin/trace/ignore/TraceIgnoreExtendService.java b/apm-sniffer/optional-plugins/trace-ignore-plugin/src/main/java/org/apache/skywalking/apm/plugin/trace/ignore/TraceIgnoreExtendService.java
index 5f4dc6afd..eaabd0ebd 100644
--- a/apm-sniffer/optional-plugins/trace-ignore-plugin/src/main/java/org/apache/skywalking/apm/plugin/trace/ignore/TraceIgnoreExtendService.java
+++ b/apm-sniffer/optional-plugins/trace-ignore-plugin/src/main/java/org/apache/skywalking/apm/plugin/trace/ignore/TraceIgnoreExtendService.java
@@ -89,6 +89,8 @@ public class TraceIgnoreExtendService extends SamplingService {
     void handleTraceIgnorePatternsChanged() {
         if (StringUtil.isNotBlank(traceIgnorePatternWatcher.getTraceIgnorePathPatterns())) {
             patterns = traceIgnorePatternWatcher.getTraceIgnorePathPatterns().split(PATTERN_SEPARATOR);
+        } else {
+            patterns = new String[] {};
         }
     }
 }