unable to locate maven clean plugin in my pom.xml

Question

I am executing maven clean command in parallel mode.

I am getting following warning.

[WARNING] The following plugins are not marked @threadSafe in yourwebapp:
[WARNING] org.apache.maven.plugins:maven-clean-plugin:2.1.1
[WARNING] org.codehaus.mojo:cobertura-maven-plugin:2.6

I could find org.codehaus.mojo:cobertura-maven-plugin:2.6 plugin but unable to find org.apache.maven.plugins:maven-clean-plugin in my pom.xml.

I know that I need to change the version of these plugin to a threadsafe version. But Unable to locate them.

can some one help where to locate maven clean plugin.

Answer 1

Clean plugin is configured implicitly in super pom. You can override (redefine) it in your project pom. Run mvn help:effective-pom or mvn clean:help to see how clean plugin is currently configured, or mvn clean:help

Answer 2

some plugins are bound to the lifecycle by default (differs with project <packaging> ) to change the version of the maven clean plugin your project uses simply declare the version you want in <pluginManagement> :

<build>
   <pluginManagement>
      <plugins>
         <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-clean-plugin</artifactId>
            <version>2.5</version>
         </plugin>
      </plugins>
   </pluginManagement>
</build>