Cross-parameter constraint is disallowed by Annotation Processor

I am using hibernate validator 5.0.3 with Java 1.6.0_45-b06-451 on OSX 10.9.1.

I have created a cross-parameter constraint as follows:

CrossParameterConstraint.java

CrossParameterConstraintValidator.java

The above constraint is used in a method as follows:

CrossParameterConstraintUsageExample.java

I have configured the Annotation Processor in pom.xml
as follows:

pom.xml

When trying to compile, the Annotation Processor reports the following error:

The annotation @CrossParameterConstraint is disallowed for the return type of this method.