<dependency>
  <groupId>com.pi4j</groupId>
  <artifactId>pi4j-core</artifactId>
  <version>1.4</version>
  <type>pom</type>
</dependency>

'com.pi4j:pi4j-core:pom:1.4'

<dependency org="com.pi4j" name="pi4j-core" rev="1.4">
  <artifact name="pi4j-core" type="pom" />
</dependency>

@Grapes(
@Grab(group='com.pi4j', module='pi4j-core', version='1.4')
)

compile 'com.pi4j:pi4j-core:1.4'

libraryDependencies += "com.pi4j" % "pi4j-core" % "1.4"

[com.pi4j/pi4j-core "1.4"]