Chapter 3. Using Red Hat Single Sign-On with Spring Boot

Procedure

1. To manually add the Keycloak Spring Boot starter, add the following to your project’s pom.xml.

   <dependency>
           <groupId>org.keycloak</groupId>
           <artifactId>keycloak-spring-boot-starter</artifactId>
   </dependency>

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2. Add the Adapter BOM dependency.

   <dependencyManagement>
     <dependencies>
           <dependency>
             <groupId>org.keycloak.bom</groupId>
             <artifactId>keycloak-adapter-bom</artifactId>
             <version>3.4.17.Final-redhat-00001</version>
             <type>pom</type>
             <scope>import</scope>
           </dependency>
     </dependencies>
   </dependencyManagement>

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3. Configure your Spring Boot project to use Keycloak. Instead of a keycloak.json file, you can configure the realm for the Spring Boot Keycloak adapter using the normal Spring Boot configuration. For example, add following configuration to src/main/resources/application.properties file.

   keycloak.realm = demorealm
   keycloak.auth-server-url = http://127.0.0.1:8080/auth
   keycloak.ssl-required = external
   keycloak.resource = demoapp
   keycloak.credentials.secret = 11111111-1111-1111-1111-111111111111
   keycloak.use-resource-role-mappings = true

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   You can disable the Keycloak Spring Boot Adapter (for example in tests) by setting keycloak.enabled = false. To configure a Policy Enforcer, unlike keycloak.json, policy-enforcer-config must be used instead of just policy-enforcer.

4. Specify the Java EE security configuration in the web.xml. The Spring Boot Adapter will set the login-method to KEYCLOAK and configure the security-constraints at the time of startup. An example configuration is given below.

   keycloak.securityConstraints[0].authRoles[0] = admin
   keycloak.securityConstraints[0].authRoles[1] = user
   keycloak.securityConstraints[0].securityCollections[0].name = insecure stuff
   keycloak.securityConstraints[0].securityCollections[0].patterns[0] = /insecure
   
   
   keycloak.securityConstraints[1].authRoles[0] = admin
   keycloak.securityConstraints[1].securityCollections[0].name = admin stuff
   keycloak.securityConstraints[1].securityCollections[0].patterns[0] = /admin

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   Note: If you plan to deploy your Spring Application as a WAR then do not use the Spring Boot Adapter. Use the dedicated adapter for the application server or servlet container you are using. Your Spring Boot should also contain a web.xml file.