wu-sheng commented on a change in pull request #6103:
URL: https://github.com/apache/skywalking/pull/6103#discussion_r550093551



##########
File path: 
apm-sniffer/apm-agent-core/src/main/java/org/apache/skywalking/apm/agent/core/plugin/WitnessClassFinder.java
##########
@@ -36,6 +36,17 @@
      * @return true, if the given witnessClass exists, through the given 
classLoader.
      */
     public boolean exist(String witnessClass, ClassLoader classLoader) {
+        return getResolution(witnessClass, classLoader)

Review comment:
       @muse-dev The `hashmap` modification is already in the double-check and 
`synchronized`. I don't think this is an issue.




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