Use try-with-resources to close resources automatically

See gh-8045

spring-boot-actuator/src/main/java/org/springframework/boot/actuate/endpoint/mvc/HeapdumpMvcEndpoint.java

@@ -51,6 +51,7 @@ import org.springframework.web.bind.annotation.ResponseStatus;
  *
  * @author Lari Hotari
  * @author Phillip Webb
+ * @author rajakolli
  * @since 1.4.0
  */
 @ConfigurationProperties(prefix = "endpoints.heapdump")
@@ -144,24 +145,12 @@ public class HeapdumpMvcEndpoint extends AbstractNamedMvcEndpoint {
 		response.setContentType("application/octet-stream");
 		response.setHeader("Content-Disposition",
 				"attachment; filename=\"" + (heapDumpFile.getName() + ".gz") + "\"");
-		try {
-			InputStream in = new FileInputStream(heapDumpFile);
-			try {
-				GZIPOutputStream out = new GZIPOutputStream(response.getOutputStream());
+		try (InputStream in = new FileInputStream(heapDumpFile);
+			GZIPOutputStream out = new GZIPOutputStream(response.getOutputStream())) {
 				StreamUtils.copy(in, out);
 				out.finish();
-			}
-			catch (NullPointerException ex) {
-			}
-			finally {
-				try {
-					in.close();
-				}
-				catch (Throwable ex) {
-				}
-			}
 		}
-		catch (FileNotFoundException ex) {
+		catch (NullPointerException | FileNotFoundException ex) {
 		}
 	}
 

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/autoconfigure/CacheStatisticsAutoConfigurationTests.java

@@ -270,13 +270,9 @@ public class CacheStatisticsAutoConfigurationTests {
 		@Bean
 		public EmbeddedCacheManager embeddedCacheManager() throws IOException {
 			Resource resource = new ClassPathResource("cache/test-infinispan.xml");
-			InputStream in = resource.getInputStream();
-			try {
+			try (InputStream in = resource.getInputStream()) {
 				return new DefaultCacheManager(in);
 			}
-			finally {
-				in.close();
-			}
 		}
 
 	}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/cache/InfinispanCacheConfiguration.java

 /*
- * 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.
@@ -88,13 +88,9 @@ public class InfinispanCacheConfiguration {
 		Resource location = this.cacheProperties
 				.resolveConfigLocation(this.cacheProperties.getInfinispan().getConfig());
 		if (location != null) {
-			InputStream in = location.getInputStream();
-			try {
+			try (InputStream in = location.getInputStream()) {
 				return new DefaultCacheManager(in);
 			}
-			finally {
-				in.close();
-			}
 		}
 		return new DefaultCacheManager();
 	}

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/ldap/embedded/EmbeddedLdapAutoConfiguration.java

@@ -154,13 +154,9 @@ public class EmbeddedLdapAutoConfiguration {
 			try {
 				Resource resource = this.applicationContext.getResource(location);
 				if (resource.exists()) {
-					InputStream inputStream = resource.getInputStream();
-					try {
+					try (InputStream inputStream = resource.getInputStream()) {
 						this.server.importFromLDIF(true, new LDIFReader(inputStream));
 					}
-					finally {
-						inputStream.close();
-					}
 				}
 			}
 			catch (Exception ex) {

spring-boot/src/main/java/org/springframework/boot/ApplicationHome.java

 /*
- * 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.
@@ -72,19 +72,11 @@ public class ApplicationHome {
 
 	private Class<?> getStartClass(Enumeration<URL> manifestResources) {
 		while (manifestResources.hasMoreElements()) {
-			try {
-				InputStream inputStream = manifestResources.nextElement().openStream();
-				try {
-					Manifest manifest = new Manifest(inputStream);
-					String startClass = manifest.getMainAttributes()
-							.getValue("Start-Class");
-					if (startClass != null) {
-						return ClassUtils.forName(startClass,
-								getClass().getClassLoader());
-					}
-				}
-				finally {
-					inputStream.close();
+			try (InputStream inputStream = manifestResources.nextElement().openStream()) {
+				Manifest manifest = new Manifest(inputStream);
+				String startClass = manifest.getMainAttributes().getValue("Start-Class");
+				if (startClass != null) {
+					return ClassUtils.forName(startClass, getClass().getClassLoader());
 				}
 			}
 			catch (Exception ex) {

spring-boot/src/main/java/org/springframework/boot/ImageBanner.java

@@ -101,14 +101,11 @@ public class ImageBanner implements Banner {
 	}
 
 	private BufferedImage readImage(int width, int height) throws IOException {
-		InputStream inputStream = this.image.getInputStream();
-		try {
+		try (InputStream inputStream = this.image.getInputStream()) {
 			BufferedImage image = ImageIO.read(inputStream);
 			return resizeImage(image, width, height);
 		}
-		finally {
-			inputStream.close();
-		}
+
 	}
 
 	private BufferedImage resizeImage(BufferedImage image, int width, int height) {

spring-boot/src/main/java/org/springframework/boot/web/embedded/undertow/FileSessionPersistence.java

@@ -95,14 +95,10 @@ class FileSessionPersistence implements SessionPersistenceManager {
 
 	private Map<String, PersistentSession> load(File file, ClassLoader classLoader)
 			throws IOException, ClassNotFoundException {
-		ObjectInputStream stream = new ConfigurableObjectInputStream(
-				new FileInputStream(file), classLoader);
-		try {
+		try (ObjectInputStream stream = new ConfigurableObjectInputStream(
+				new FileInputStream(file), classLoader)) {
 			return load(stream);
 		}
-		finally {
-			stream.close();
-		}
 	}
 
 	private Map<String, PersistentSession> load(ObjectInputStream stream)

spring-boot/src/test/java/org/springframework/boot/web/servlet/server/AbstractServletWebServerFactoryTests.java

@@ -1196,14 +1196,10 @@ public abstract class AbstractServletWebServerFactoryTests {
 			NoSuchAlgorithmException, CertificateException {
 		KeyStore keyStore = KeyStore.getInstance("JKS");
 		Resource resource = new ClassPathResource("test.jks");
-		InputStream inputStream = resource.getInputStream();
-		try {
+		try (InputStream inputStream = resource.getInputStream()) {
 			keyStore.load(inputStream, "secret".toCharArray());
 			return keyStore;
 		}
-		finally {
-			inputStream.close();
-		}
 	}
 
 	private class TestGzipInputStreamFactory implements InputStreamFactory {