Emma is an alternative to Clover and Cobertura to measure coverage by unit tests.
'org.codehaus.sonar-plugins:sonar-emma-plugin:1.0'
<dependency>
<groupId>org.codehaus.sonar-plugins</groupId>
<artifactId>sonar-emma-plugin</artifactId>
<version>1.0</version>
</dependency>
<dependency org="org.codehaus.sonar-plugins" name="sonar-emma-plugin" rev="1.0"/>
"org.codehaus.sonar-plugins", "sonar-emma-plugin", "1.0"