Wicketstuff core modules that require to be build using Java 7. Typically this is because of a Java 7 feature requirement or Java 7 compiled upstream dependency.
'org.wicketstuff:jdk-1.7-parent:6.2.0'
<dependency>
<groupId>org.wicketstuff</groupId>
<artifactId>jdk-1.7-parent</artifactId>
<version>6.2.0</version>
</dependency>
<dependency org="org.wicketstuff" name="jdk-1.7-parent" rev="6.2.0"/>
"org.wicketstuff", "jdk-1.7-parent", "6.2.0"