<dependency>
  <groupId>org.codehaus.mojo.appassembler</groupId>
  <artifactId>appassembler</artifactId>
  <version>2.1.0</version>
  <type>pom</type>
</dependency>

'org.codehaus.mojo.appassembler:appassembler:pom:2.1.0'

<dependency org="org.codehaus.mojo.appassembler" name="appassembler" rev="2.1.0">
  <artifact name="appassembler" type="pom" />
</dependency>

@Grapes(
@Grab(group='org.codehaus.mojo.appassembler', module='appassembler', version='2.1.0')
)

compile 'org.codehaus.mojo.appassembler:appassembler:2.1.0'

[org.codehaus.mojo.appassembler/appassembler "2.1.0"]

libraryDependencies += "org.codehaus.mojo.appassembler" % "appassembler" % "2.1.0"