What does it mean when a plugin element doesn't have a groupId element?

["David M. Karr" <da...@gmail.com>]

In "Maven: The Definitive Guide", there is a pom.xml sample like this:

-----------------
<plugin>
   <groupId>org.apache.maven.plugins</groupId>
   <artifactId>maven-surefire-plugin</artifactId>
   <configuration>
     <testFailureIgnore>true</testFailureIgnore>
   </configuration>
</plugin>
<plugin>
  <artifactId>maven-assembly-plugin</artifactId>
   <configuration>
     <descriptorRefs>
       <descriptorRef>jar-with-dependencies</descriptorRef>
     </descriptorRefs>
   </configuration>
</plugin>
-----------------

I noticed that all the references to "maven-assembly-plugin" do not have 
a "groupId" value.  Why doesn't this have a "groupId" value, and what is 
the impact of that?

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Re: What does it mean when a plugin element doesn't have a groupId element?

[Wayne Fay <wa...@gmail.com>]

> I noticed that all the references to "maven-assembly-plugin" do not have a
> "groupId" value.  Why doesn't this have a "groupId" value, and what is the
> impact of that?

The default for plugins is o.a.m.p (org.apache.maven.plugins). Its
generally a good idea to include groupIds, but not absolutely required
if you are using o.a.m.p plugins.

Wayne

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