Fix SAML 2.0 Javaconfig Sample

Issue gh-9362

samples/javaconfig/saml2login/spring-security-samples-javaconfig-saml2login.gradle

@@ -3,6 +3,7 @@ apply plugin: 'io.spring.convention.spring-sample-war'
 dependencies {
 	compile project(':spring-security-saml2-service-provider')
 	compile project(':spring-security-config')
+	compile slf4jDependencies
 
 	testCompile 'org.springframework:spring-test'
 }

samples/javaconfig/saml2login/src/main/java/org/springframework/security/samples/config/MessageSecurityWebApplicationInitializer.java

@@ -28,6 +28,10 @@ import org.springframework.security.web.session.HttpSessionEventPublisher;
 public class MessageSecurityWebApplicationInitializer extends
 		AbstractSecurityWebApplicationInitializer {
 
+	public MessageSecurityWebApplicationInitializer() {
+		super(SecurityConfig.class);
+	}
+
 	@Override
 	protected boolean enableHttpSessionEventPublisher() {
 		return true;

samples/javaconfig/saml2login/src/main/java/org/springframework/security/samples/config/SecurityConfig.java

@@ -21,6 +21,7 @@ import java.security.cert.X509Certificate;
 import org.opensaml.security.x509.X509Support;
 
 import org.springframework.context.annotation.Bean;
+import org.springframework.security.config.Customizer;
 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.configuration.WebSecurityConfigurerAdapter;
@@ -52,9 +53,7 @@ public class SecurityConfig extends WebSecurityConfigurerAdapter {
 			.authorizeRequests((authz) -> authz
 				.anyRequest().authenticated()
 			)
-			.saml2Login((saml2) -> saml2
-				.loginProcessingUrl("/sample/jc/saml2/sso/{registrationId}")
-			);
+			.saml2Login(Customizer.withDefaults());
 		// @formatter:on
 	}
 

samples/javaconfig/saml2login/src/main/resources/logback.xml

@@ -0,0 +1,12 @@
+<configuration>
+	<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+	<encoder>
+		<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+	</encoder>
+	</appender>
+
+	<root level="WARN">
+		<appender-ref ref="STDOUT" />
+	</root>
+
+</configuration>