protected boolean validateInternal(final WebContext context,
                                       final String grantType,
                                       final ProfileManager manager,
                                       final UserProfile userProfile) throws Throwable {
        return false;
    }
This is {@link BaseOAuth20TokenRequestValidator}.

@author Misagh Moayyed
@since 5.3.0
support/cas-server-support-oauth-core-api/src/main/java/org/apereo/cas/support/oauth/validator/token/BaseOAuth20TokenRequestValidator.java