Spring-HATEOAS relative links.java

private static final MappingDiscoverer DISCOVERER = new AnnotationMappingDiscoverer(RequestMapping.class);

public static URI linkTo(Object invocationValue) {
    LastInvocationAware invocations = (LastInvocationAware) invocationValue;
    DummyInvocationUtils.MethodInvocation invocation = invocations.getLastInvocation();

    String mapping = DISCOVERER.getMapping(invocation.getTargetType(), invocation.getMethod());

    return new UriTemplate(mapping).expand(invocation.getArguments());
}

I am relatively new to Java and Spring-boot. How do you make it work with spring boot? Did you create a new file with this code in the codebase or add this static method? I can change the other URLs from absolute to relative but not the pagination URLs since PagedResourcesAssembler generates those.