问题
I have a Maven web project in my repo.
I am a Maven noob but still I understand the fact that there are plugins which we need to configure only then we could run plugin specific commands.
Facts:
I have a sonar server running on my local machine at port 9000.
I have not added any sonar specific plugin in my POM.xml
Reference:
http://www.sonarsource.org/we-had-a-dream-mvn-sonarsonar/
Observation:
But still when I run mvn sonar:sonar in my project from command line it works fine.
Matter of the fact is I have NOT configured sonar plugin in my POM.xml Even then from where the hell Maven is picking up and understanding "sonar:sonar" goal/command?
Question / curiosity:
I don't want the working knowledge of sonar itself. I want to know why mvn sonar:sonar works without configuring a sonar plugin in my pom.xml
WHY and how?
回答1:
The reason is that the Sonar Maven Plugin is hosted at the Codehaus Mojo project and benefits from the groupId "org.codehaus.mojo". This allows to use the shortcut "sonar:sonar" instead of "org.codehaus.mojo:sonar-maven-plugin::sonar" (see the section "Configuring Maven to Search for Plugins" of the Maven documentation)
回答2:
Sonar has its own set of plugins (e.g. maven-checkstyle-plugin) which it is running when being invoked. These plugins are automatically configured according to your project settings in your configured Sonar server.
The reasoning behind this to have a controlled configuration in your sonar instance.
The reason it is working automatically for you is that you are using the default values for your sonar server installation (localhost:9000).
This 'zero-configuration' approach is further detailed here: We had a dream : mvn sonar:sonar
来源：https://stackoverflow.com/questions/14979530/why-does-the-maven-command-mvn-sonarsonar-work-without-any-plugin-configurati