web.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
  ~ Copyright 2016 Red Hat, Inc. and/or its affiliates
  ~ and other contributors as indicated by the @author tags.
  ~
  ~ Licensed under the Apache License, Version 2.0 (the "License");
  ~ you may not use this file except in compliance with the License.
  ~ You may obtain a copy of the License at
  ~
  ~ http://www.apache.org/licenses/LICENSE-2.0
  ~
  ~ Unless required by applicable law or agreed to in writing, software
  ~ distributed under the License is distributed on an "AS IS" BASIS,
  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  ~ See the License for the specific language governing permissions and
  ~ limitations under the License.
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<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0">

    <module-name>%CONTEXT_PATH%</module-name>

    <servlet>
        <servlet-name>javax.ws.rs.core.Application</servlet-name>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>javax.ws.rs.core.Application</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>

    <error-page>
        <location>/error.html</location>
    </error-page>

    <security-constraint>
        <web-resource-collection>
            <web-resource-name>Application</web-resource-name>
            <url-pattern>/*</url-pattern>
        </web-resource-collection>
        <auth-constraint>
            <role-name>manager</role-name>
        </auth-constraint>
    </security-constraint>
    <security-constraint>
        <web-resource-collection>
            <web-resource-name>Unsecured-setCheckRoles</web-resource-name>
            <url-pattern>/setCheckRoles/*</url-pattern>
        </web-resource-collection>
    </security-constraint>
    <security-constraint>
        <web-resource-collection>
            <web-resource-name>Unsecured-uncheckRoles</web-resource-name>
            <url-pattern>/uncheckRoles/*</url-pattern>
        </web-resource-collection>
    </security-constraint>

    <login-config>
        <auth-method>KEYCLOAK-SAML</auth-method>
        <realm-name>demo</realm-name>
    </login-config>

    <security-role>
        <role-name>manager</role-name>
    </security-role>
</web-app>