diff --git a/spring-boot-modules/spring-boot-keycloak/pom.xml b/spring-boot-modules/spring-boot-keycloak/pom.xml
index bada9ab52d..13339c9de1 100644
--- a/spring-boot-modules/spring-boot-keycloak/pom.xml
+++ b/spring-boot-modules/spring-boot-keycloak/pom.xml
@@ -102,7 +102,7 @@
     </build>
 
     <properties>
-        <start-class>com.baeldung.keycloak.SpringBoot</start-class>
+        <start-class>com.baeldung.keycloak.SpringBootKeycloakApp</start-class>
         <jaxb-runtime.version>4.0.0</jaxb-runtime.version>
         <wsdl4j.version>1.6.3</wsdl4j.version>
         <jaxb2-maven-plugin.version>2.5.0</jaxb2-maven-plugin.version>
diff --git a/spring-boot-modules/spring-boot-keycloak/src/main/java/com/baeldung/keycloak/SpringBoot.java b/spring-boot-modules/spring-boot-keycloak/src/main/java/com/baeldung/keycloak/SpringBootKeycloakApp.java
similarity index 80%
rename from spring-boot-modules/spring-boot-keycloak/src/main/java/com/baeldung/keycloak/SpringBoot.java
rename to spring-boot-modules/spring-boot-keycloak/src/main/java/com/baeldung/keycloak/SpringBootKeycloakApp.java
index 90d7e774a4..a6f978fb3f 100644
--- a/spring-boot-modules/spring-boot-keycloak/src/main/java/com/baeldung/keycloak/SpringBoot.java
+++ b/spring-boot-modules/spring-boot-keycloak/src/main/java/com/baeldung/keycloak/SpringBootKeycloakApp.java
@@ -6,11 +6,10 @@ import org.springframework.context.annotation.Bean;
 import org.springframework.web.client.RestTemplate;
 
 @SpringBootApplication
-
-public class SpringBoot {
+public class SpringBootKeycloakApp {
 
     public static void main(String[] args) {
-        SpringApplication.run(SpringBoot.class, args);
+        SpringApplication.run(SpringBootKeycloakApp.class, args);
     }
 
     @Bean
diff --git a/spring-boot-modules/spring-boot-keycloak/src/test/java/com/baeldung/keycloak/KeycloakContextIntegrationTest.java b/spring-boot-modules/spring-boot-keycloak/src/test/java/com/baeldung/keycloak/KeycloakContextIntegrationTest.java
index 336c8364aa..116516acfe 100644
--- a/spring-boot-modules/spring-boot-keycloak/src/test/java/com/baeldung/keycloak/KeycloakContextIntegrationTest.java
+++ b/spring-boot-modules/spring-boot-keycloak/src/test/java/com/baeldung/keycloak/KeycloakContextIntegrationTest.java
@@ -4,10 +4,9 @@ import org.junit.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.springframework.boot.test.context.SpringBootTest;
 import org.springframework.test.context.junit.jupiter.SpringExtension;
-import com.baeldung.keycloak.SpringBoot;
 
 @ExtendWith(SpringExtension.class)
-@SpringBootTest(classes = { SpringBoot.class })
+@SpringBootTest(classes = { SpringBootKeycloakApp.class })
 public class KeycloakContextIntegrationTest {
 
     @Test
diff --git a/spring-boot-modules/spring-boot-swagger-keycloak/src/main/java/com/baeldung/swaggerkeycloak/GlobalSecurityConfig.java b/spring-boot-modules/spring-boot-swagger-keycloak/src/main/java/com/baeldung/swaggerkeycloak/GlobalSecurityConfig.java
index 5c24368ce6..9a1bf547db 100644
--- a/spring-boot-modules/spring-boot-swagger-keycloak/src/main/java/com/baeldung/swaggerkeycloak/GlobalSecurityConfig.java
+++ b/spring-boot-modules/spring-boot-swagger-keycloak/src/main/java/com/baeldung/swaggerkeycloak/GlobalSecurityConfig.java
@@ -3,10 +3,11 @@ package com.baeldung.swaggerkeycloak;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.http.HttpMethod;
+import org.springframework.security.config.Customizer;
 import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
 import org.springframework.security.config.annotation.web.builders.HttpSecurity;
 import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
-import org.springframework.security.config.annotation.web.configurers.oauth2.server.resource.OAuth2ResourceServerConfigurer;
+import org.springframework.security.config.annotation.web.configurers.AbstractHttpConfigurer;
 import org.springframework.security.core.session.SessionRegistryImpl;
 import org.springframework.security.web.SecurityFilterChain;
 import org.springframework.security.web.authentication.session.RegisterSessionAuthenticationStrategy;
@@ -24,16 +25,19 @@ public class GlobalSecurityConfig {
 
     @Bean
     public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
-        http.csrf()
-            .disable()
-            .authorizeRequests()
-            .requestMatchers(HttpMethod.OPTIONS)
+
+        http.csrf(AbstractHttpConfigurer::disable)
+            .authorizeHttpRequests((requests) -> requests.requestMatchers(HttpMethod.OPTIONS)
             .permitAll()
             .requestMatchers("/api/**")
             .authenticated()
             .anyRequest()
-            .permitAll();
-        http.oauth2ResourceServer(OAuth2ResourceServerConfigurer::jwt);
+            .permitAll());
+
+        http.oauth2ResourceServer((oauth2) -> oauth2
+            .jwt(Customizer.withDefaults())
+        );
+
         return http.build();
     }