protected Assertion validateServiceTicket(final WebApplicationService service, final String serviceTicketId) throws Throwable {
        return serviceValidateConfigurationContext.getCentralAuthenticationService().validateServiceTicket(serviceTicketId, service);
    }
Add validation specification.

@param validationSpecification the validation specification
support/cas-server-support-validation-core/src/main/java/org/apereo/cas/web/AbstractServiceValidateController.java