Move ehcache-2.x plugin as optional (#7236)

CHANGES.md

@@ -28,6 +28,7 @@ Release Notes.
 * Fix some method exception error.
 * Fix async finish repeatedly in `spring-webflux-5.x-webclient` plugin.
 * Add agent plugin to support Sentinel.
+* Move `ehcache-2.x` plugin as an optional plugin.
 
 #### OAP-Backend
 

apm-sniffer/apm-sdk-plugin/pom.xml

@@ -87,7 +87,6 @@
         <module>solrj-7.x-plugin</module>
         <module>cassandra-java-driver-3.x-plugin</module>
         <module>light4j-plugins</module>
-        <module>ehcache-2.x-plugin</module>
         <module>pulsar-plugin</module>
         <module>netty-socketio-plugin</module>
         <module>armeria-0.84.x-plugin</module>

apm-sniffer/apm-sdk-plugin/ehcache-2.x-plugin/pom.xml → apm-sniffer/optional-plugins/ehcache-2.x-plugin/pom.xml

@@ -19,8 +19,8 @@
 
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <parent>
-        <artifactId>apm-sdk-plugin</artifactId>
         <groupId>org.apache.skywalking</groupId>
+        <artifactId>optional-plugins</artifactId>
         <version>8.7.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>

apm-sniffer/optional-plugins/pom.xml

@@ -51,6 +51,7 @@
         <module>quartz-scheduler-2.x-plugin</module>
         <module>mybatis-3.x-plugin</module>
         <module>sentinel-1.x-plugin</module>
+        <module>ehcache-2.x-plugin</module>
     </modules>
 
     <dependencies>

docs/en/setup/service-agent/java-agent/README.md

@@ -194,6 +194,7 @@ Now, we have the following known optional plugins.
 * Plugin of spring-webflux-5.x in the optional plugin folder. Please only activate this plugin when you use webflux alone as a web container. If you are using SpringMVC 5 or Spring Gateway, you don't need this plugin.
 * Plugin of mybatis-3.x in optional plugin folder. The reason of being optional plugin is, many local span are generated, which also spend more CPU, memory and network.
 * Plugin of sentinel-1.x in the optional plugin folder. The reason for being an optional plugin is, the sentinel plugin generates a large number of local spans, which have a potential performance impact.
+* Plugin of ehcache-2.x in the optional plugin folder. The reason for being an optional plugin is, this plugin enhanced cache framework, generates large number of local spans, which have a potential performance impact.
 
 ## Bootstrap class plugins
 All bootstrap plugins are optional, due to unexpected risk. Bootstrap plugins are provided in `bootstrap-plugins` folder.

test/plugin/scenarios/ehcache-2.x-scenario/configuration.yml

@@ -17,3 +17,5 @@
 type: tomcat
 entryService: http://localhost:8080/ehcache-2.x-scenario/case/ehcache
 healthCheck: http://localhost:8080/ehcache-2.x-scenario/healthCheck
+runningMode: with_optional
+withPlugins: apm-ehcache-2.x-plugin-*.jar
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