Polish "Use try-with-resources to close resources automatically"

- Apply code formatting
- Use try-with-resources in many other places that were missed in the
  pull request

Closes gh-8045

spring-boot-tools/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/StartMojo.java

@@ -205,21 +205,18 @@ public class StartMojo extends AbstractRunMojo {
 			throws IOException, MojoFailureException, MojoExecutionException {
 		try {
 			getLog().debug("Connecting to local MBeanServer at port " + this.jmxPort);
-			JMXConnector connector = execute(this.wait, this.maxAttempts,
-					new CreateJmxConnector(this.jmxPort));
-			if (connector == null) {
-				throw new MojoExecutionException(
-						"JMX MBean server was not reachable before the configured "
-								+ "timeout (" + (this.wait * this.maxAttempts) + "ms");
-			}
-			getLog().debug("Connected to local MBeanServer at port " + this.jmxPort);
-			try {
+			try (JMXConnector connector = execute(this.wait, this.maxAttempts,
+					new CreateJmxConnector(this.jmxPort))) {
+				if (connector == null) {
+					throw new MojoExecutionException(
+							"JMX MBean server was not reachable before the configured "
+									+ "timeout (" + (this.wait * this.maxAttempts)
+									+ "ms");
+				}
+				getLog().debug("Connected to local MBeanServer at port " + this.jmxPort);
 				MBeanServerConnection connection = connector.getMBeanServerConnection();
 				doWaitForSpringApplication(connection);
 			}
-			finally {
-				connector.close();
-			}
 		}
 		catch (IOException ex) {
 			throw ex;

spring-boot-tools/spring-boot-maven-plugin/src/main/java/org/springframework/boot/maven/StopMojo.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2016 the original author or authors.
+ * Copyright 2012-2017 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -110,14 +110,11 @@ public class StopMojo extends AbstractMojo {
 
 	private void stopForkedProcess()
 			throws IOException, MojoFailureException, MojoExecutionException {
-		JMXConnector connector = SpringApplicationAdminClient.connect(this.jmxPort);
-		try {
+		try (JMXConnector connector = SpringApplicationAdminClient
+				.connect(this.jmxPort)) {
 			MBeanServerConnection connection = connector.getMBeanServerConnection();
 			doStop(connection);
 		}
-		finally {
-			connector.close();
-		}
 	}
 
 	private void stop() throws IOException, MojoFailureException, MojoExecutionException {

spring-boot-tools/spring-boot-maven-plugin/src/test/java/org/springframework/boot/maven/Verify.java

@@ -198,14 +198,10 @@ public final class Verify {
 						.startsWith(new String(new byte[] { 0x50, 0x4b, 0x03, 0x04 }));
 			}
 
-			ZipFile zipFile = new ZipFile(this.file);
-			try {
+			try (ZipFile zipFile = new ZipFile(this.file)) {
 				ArchiveVerifier verifier = new ArchiveVerifier(zipFile);
 				verifyZipEntries(verifier);
 			}
-			finally {
-				zipFile.close();
-			}
 		}
 
 		protected void verifyZipEntries(ArchiveVerifier verifier) throws Exception {