wu-sheng commented on a change in pull request #6103:
URL: https://github.com/apache/skywalking/pull/6103#discussion_r550076964
##########
File path: docs/en/guides/Java-Plugin-Development-Guide.md
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@@ -299,6 +299,30 @@ The following sections will tell you how to implement the
interceptor.
tomcat-7.x/8.x=TomcatInstrumentation
```
+4. If a plugin should be activated or not in different condition.You can
Override the witnessClasses or witnessMethods.
+
+ Example:
+
+ ```java
+ //the plugin is activated only when the foo.Bar class exists.
+ @Override
+ protected String[] witnessClasses() {
+ return new String[] {
+ "foo.Bar"
+ };
+ }
+
+ //the plugin is activated only when the foo.Bar#hello method exists.
+ @Override
+ protected List<WitnessMethod> witnessClasses() {
Review comment:
```suggestion
protected List<WitnessMethod> witnessMethods() {
```
Copy/paste issue?
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