Upgrade to Logback 1.1.7

Closes gh-5568

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/BackgroundPreinitializer.java

@@ -20,11 +20,9 @@ import javax.validation.Validation;
 
 import org.apache.catalina.mbeans.MBeanFactory;
 
-import org.springframework.boot.context.event.ApplicationStartedEvent;
+import org.springframework.boot.context.event.ApplicationEnvironmentPreparedEvent;
 import org.springframework.boot.logging.LoggingApplicationListener;
-import org.springframework.context.ApplicationEvent;
 import org.springframework.context.ApplicationListener;
-import org.springframework.context.event.ContextRefreshedEvent;
 import org.springframework.core.annotation.Order;
 import org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter;
 
@@ -37,21 +35,11 @@ import org.springframework.http.converter.support.AllEncompassingFormHttpMessage
  * @since 1.3.0
  */
 @Order(LoggingApplicationListener.DEFAULT_ORDER + 1)
-public class BackgroundPreinitializer implements ApplicationListener<ApplicationEvent> {
+public class BackgroundPreinitializer
-
+		implements ApplicationListener<ApplicationEnvironmentPreparedEvent> {
-	private volatile Thread initializationThread;
 
 	@Override
-	public void onApplicationEvent(ApplicationEvent event) {
+	public void onApplicationEvent(ApplicationEnvironmentPreparedEvent event) {
-		if (event instanceof ApplicationStartedEvent) {
-			performInitialization();
-		}
-		else if (event instanceof ContextRefreshedEvent) {
-			awaitInitialization();
-		}
-	}
-
-	private void performInitialization() {
 		try {
 			Thread thread = new Thread(new Runnable() {
 
@@ -73,7 +61,6 @@ public class BackgroundPreinitializer implements ApplicationListener<Application
 
 			}, "background-preinit");
 			thread.start();
-			this.initializationThread = thread;
 		}
 		catch (Exception ex) {
 			// This will fail on GAE where creating threads is prohibited. We can safely
@@ -82,21 +69,6 @@ public class BackgroundPreinitializer implements ApplicationListener<Application
 		}
 	}
 
-	private void awaitInitialization() {
-		Thread thread = this.initializationThread;
-		if (thread != null) {
-			try {
-				thread.join();
-			}
-			catch (InterruptedException ex) {
-				Thread.currentThread().interrupt();
-			}
-			finally {
-				this.initializationThread = null;
-			}
-		}
-	}
-
 	/**
 	 * Early initializer for Spring MessageConverters.
 	 */
@@ -132,4 +104,5 @@ public class BackgroundPreinitializer implements ApplicationListener<Application
 		}
 
 	}
+
 }

spring-boot-dependencies/pom.xml

@@ -112,7 +112,7 @@
 		<liquibase.version>3.4.2</liquibase.version>
 		<log4j.version>1.2.17</log4j.version>
 		<log4j2.version>2.4.1</log4j2.version>
-		<logback.version>1.1.6</logback.version>
+		<logback.version>1.1.7</logback.version>
 		<mariadb.version>1.2.3</mariadb.version>
 		<mockito.version>1.10.19</mockito.version>
 		<mongodb.version>2.13.3</mongodb.version>