'org.wicketstuff:wicketstuff-select2:6.20.0'
<dependency>
<groupId>org.wicketstuff</groupId>
<artifactId>wicketstuff-select2</artifactId>
<version>6.20.0</version>
</dependency>
<dependency org="org.wicketstuff" name="wicketstuff-select2" rev="6.20.0"/>
"org.wicketstuff", "wicketstuff-select2", "6.20.0"