Include last couple of steps from blog post for getting Principal name

src/main/java/com/example/productapp/ProductAppApplication.java

@@ -1,5 +1,11 @@
 package com.example.productapp;
 
+import java.security.Principal;
+import java.util.Arrays;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+
 import org.keycloak.adapters.KeycloakConfigResolver;
 import org.keycloak.adapters.springboot.KeycloakSpringBootConfigResolver;
 import org.keycloak.adapters.springsecurity.KeycloakSecurityComponents;
@@ -22,69 +28,62 @@
 import org.springframework.ui.Model;
 import org.springframework.web.bind.annotation.GetMapping;
 
-import javax.servlet.ServletException;
-import javax.servlet.http.HttpServletRequest;
-import java.util.Arrays;
-
 @SpringBootApplication
 public class ProductAppApplication {
 
-	public static void main(String[] args) {
-		SpringApplication.run(ProductAppApplication.class, args);
-	}
+    public static void main(String[] args) {
+        SpringApplication.run(ProductAppApplication.class, args);
+    }
 }
 
 @Controller
 class ProductController {
+    @GetMapping(path = "/products")
+    public String getProducts(Principal principal, Model model){
+       model.addAttribute("principal",principal);
+       model.addAttribute("products", Arrays.asList("iPad", "iPhone", "iPod"));
+       return "products";
+    }
 
-	@GetMapping(path = "/products")
-	public String getProducts(Model model){
-		model.addAttribute("products", Arrays.asList("iPad","iPhone","iPod"));
-		return "products";
-	}
-
-	@GetMapping(path = "/logout")
-	public String logout(HttpServletRequest request) throws ServletException {
-		request.logout();
-		return "/";
-	}
+    @GetMapping(path = "/logout")
+    public String logout(HttpServletRequest request) throws ServletException {
+        request.logout();
+        return "/";
+    }
 }
 
 @Configuration
 @EnableWebSecurity
 @ComponentScan(basePackageClasses = KeycloakSecurityComponents.class)
-class SecurityConfig extends KeycloakWebSecurityConfigurerAdapter
-{
-	/**
-	 * Registers the KeycloakAuthenticationProvider with the authentication manager.
-	 */
-	@Autowired
-	public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
-		KeycloakAuthenticationProvider keycloakAuthenticationProvider = keycloakAuthenticationProvider();
-		keycloakAuthenticationProvider.setGrantedAuthoritiesMapper(new SimpleAuthorityMapper());
-		auth.authenticationProvider(keycloakAuthenticationProvider);
-	}
+class SecurityConfig extends KeycloakWebSecurityConfigurerAdapter {
+    /**
+     * Registers the KeycloakAuthenticationProvider with the authentication
+     * manager.
+     */
+    @Autowired
+    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
+        KeycloakAuthenticationProvider keycloakAuthenticationProvider = keycloakAuthenticationProvider();
+        keycloakAuthenticationProvider.setGrantedAuthoritiesMapper(new SimpleAuthorityMapper());
+        auth.authenticationProvider(keycloakAuthenticationProvider);
+    }
 
-	/**
-	 * Defines the session authentication strategy.
-	 */
-	@Bean
-	@Override
-	protected SessionAuthenticationStrategy sessionAuthenticationStrategy() {
-		return new RegisterSessionAuthenticationStrategy(new SessionRegistryImpl());
-	}
+    /**
+     * Defines the session authentication strategy.
+     */
+    @Bean
+    @Override
+    protected SessionAuthenticationStrategy sessionAuthenticationStrategy() {
+        return new RegisterSessionAuthenticationStrategy(new SessionRegistryImpl());
+    }
 
-	@Bean
-	public KeycloakConfigResolver KeycloakConfigResolver() {return new KeycloakSpringBootConfigResolver();}
+    @Bean
+    public KeycloakConfigResolver KeycloakConfigResolver() {
+        return new KeycloakSpringBootConfigResolver();
+    }
 
-	@Override
-	protected void configure(HttpSecurity http) throws Exception
-	{
-		super.configure(http);
-		http
-				.authorizeRequests()
-				.antMatchers("/products*").hasRole("user")
-				.anyRequest().permitAll();
-	}
+    @Override
+    protected void configure(HttpSecurity http) throws Exception {
+        super.configure(http);
+        http.authorizeRequests().antMatchers("/products*").hasRole("user").anyRequest().permitAll();
+    }
 }
-

src/main/resources/application.properties

@@ -1,4 +1,10 @@
-keycloak.auth-server-url=http://localhost:8180/auth
-keycloak.realm=springdemo
+server.port=8081
+
+#keycloak.auth-server-url=http://localhost:8180/auth
+keycloak.auth-server-url=http://localhost:8080/auth
+#keycloak.realm=springdemo
+keycloak.realm=demo
 keycloak.resource=product-app
 keycloak.public-client=true
+
+keycloak.principal-attribute=preferred_username

src/main/resources/templates/products.ftl

@@ -1,11 +1,12 @@
 <#import "/spring.ftl" as spring>
 <html>
-<h1>My products</h1>
+<h1>Hello ${principal.getName()}</h1>
 <ul>
 <#list products as product>
     <li>${product}</li>
 </#list>
 </ul>
-<br>
-<a href="/logout">Logout</a>
+<p>
+    <a href="/logout">Logout</a>
+</p>
 </html>