Add @Configuration on @Enable*-annotated classes

servlet/java-configuration/max-sessions/src/main/java/example/SecurityConfiguration.java

@@ -17,6 +17,7 @@
 package example;
 
 import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 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;
@@ -28,6 +29,7 @@ import org.springframework.security.web.SecurityFilterChain;
 
 import static org.springframework.security.config.Customizer.withDefaults;
 
+@Configuration
 @EnableWebSecurity
 @EnableGlobalMethodSecurity(prePostEnabled = true)
 public class SecurityConfiguration {