Polish "Properly close input streams when loading key stores"

See gh-25884

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/couchbase/CouchbaseAutoConfiguration.java

 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -108,8 +108,8 @@ public class CouchbaseAutoConfiguration {
 	private KeyStore loadKeyStore(String resource, String keyStorePassword) throws Exception {
 		KeyStore store = KeyStore.getInstance(KeyStore.getDefaultType());
 		URL url = ResourceUtils.getURL(resource);
-		try (InputStream inputStream = url.openStream()) {
-			store.load(inputStream, (keyStorePassword != null) ? keyStorePassword.toCharArray() : null);
+		try (InputStream stream = url.openStream()) {
+			store.load(stream, (keyStorePassword != null) ? keyStorePassword.toCharArray() : null);
 		}
 		return store;
 	}

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/web/embedded/netty/SslServerCustomizer.java

 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -171,8 +171,8 @@ public class SslServerCustomizer implements NettyServerCustomizer {
 		KeyStore store = (provider != null) ? KeyStore.getInstance(type, provider) : KeyStore.getInstance(type);
 		try {
 			URL url = ResourceUtils.getURL(resource);
-			try (InputStream inputStream = url.openStream()) {
-				store.load(inputStream, (password != null) ? password.toCharArray() : null);
+			try (InputStream stream = url.openStream()) {
+				store.load(stream, (password != null) ? password.toCharArray() : null);
 			}
 			return store;
 		}

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

 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -182,8 +182,8 @@ class SslBuilderCustomizer implements UndertowBuilderCustomizer {
 		KeyStore store = (provider != null) ? KeyStore.getInstance(type, provider) : KeyStore.getInstance(type);
 		try {
 			URL url = ResourceUtils.getURL(resource);
-			try (InputStream inputStream = url.openStream()) {
-				store.load(inputStream, (password != null) ? password.toCharArray() : null);
+			try (InputStream stream = url.openStream()) {
+				store.load(stream, (password != null) ? password.toCharArray() : null);
 			}
 			return store;
 		}

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/embedded/tomcat/SslConnectorCustomizerTests.java

 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -220,8 +220,8 @@ class SslConnectorCustomizerTests {
 	private KeyStore loadStore() throws KeyStoreException, IOException, NoSuchAlgorithmException, CertificateException {
 		KeyStore keyStore = KeyStore.getInstance("JKS");
 		Resource resource = new ClassPathResource("test.jks");
-		try (InputStream inputStream = resource.getInputStream()) {
-			keyStore.load(inputStream, "secret".toCharArray());
+		try (InputStream stream = resource.getInputStream()) {
+			keyStore.load(stream, "secret".toCharArray());
 			return keyStore;
 		}
 	}

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/reactive/server/AbstractReactiveWebServerFactoryTests.java

@@ -16,8 +16,8 @@
 
 package org.springframework.boot.web.reactive.server;
 
-import java.io.File;
 import java.io.FileInputStream;
+import java.io.InputStream;
 import java.net.InetSocketAddress;
 import java.nio.charset.StandardCharsets;
 import java.security.KeyStore;
@@ -228,7 +228,9 @@ public abstract class AbstractReactiveWebServerFactoryTests {
 
 	protected ReactorClientHttpConnector buildTrustAllSslWithClientKeyConnector() throws Exception {
 		KeyStore clientKeyStore = KeyStore.getInstance(KeyStore.getDefaultType());
-		clientKeyStore.load(new FileInputStream(new File("src/test/resources/test.jks")), "secret".toCharArray());
+		try (InputStream stream = new FileInputStream("src/test/resources/test.jks")) {
+			clientKeyStore.load(stream, "secret".toCharArray());
+		}
 		KeyManagerFactory clientKeyManagerFactory = KeyManagerFactory
 				.getInstance(KeyManagerFactory.getDefaultAlgorithm());
 		clientKeyManagerFactory.init(clientKeyStore, "password".toCharArray());

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/server/SslConfigurationValidatorTests.java

 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2021 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.
@@ -16,8 +16,8 @@
 
 package org.springframework.boot.web.server;
 
-import java.io.File;
 import java.io.FileInputStream;
+import java.io.InputStream;
 import java.security.KeyStore;
 import java.security.KeyStoreException;
 
@@ -43,7 +43,9 @@ class SslConfigurationValidatorTests {
 	@BeforeEach
 	void loadKeystore() throws Exception {
 		this.keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
-		this.keyStore.load(new FileInputStream(new File("src/test/resources/test.jks")), "secret".toCharArray());
+		try (InputStream stream = new FileInputStream("src/test/resources/test.jks")) {
+			this.keyStore.load(stream, "secret".toCharArray());
+		}
 	}
 
 	@Test

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

@@ -17,7 +17,6 @@
 package org.springframework.boot.web.servlet.server;
 
 import java.io.File;
-import java.io.FileInputStream;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.io.InputStream;
@@ -126,6 +125,7 @@ import org.springframework.boot.web.servlet.ServletContextInitializer;
 import org.springframework.boot.web.servlet.ServletRegistrationBean;
 import org.springframework.boot.web.servlet.server.Session.SessionTrackingMode;
 import org.springframework.core.io.ClassPathResource;
+import org.springframework.core.io.FileSystemResource;
 import org.springframework.core.io.Resource;
 import org.springframework.http.HttpMethod;
 import org.springframework.http.HttpStatus;
@@ -542,7 +542,7 @@ public abstract class AbstractServletWebServerFactoryTests {
 		this.webServer = factory.getWebServer();
 		this.webServer.start();
 		KeyStore keyStore = KeyStore.getInstance("pkcs12");
-		keyStore.load(new FileInputStream(new File("src/test/resources/test.p12")), "secret".toCharArray());
+		loadStore(keyStore, new FileSystemResource("src/test/resources/test.p12"));
 		SSLConnectionSocketFactory socketFactory = new SSLConnectionSocketFactory(
 				new SSLContextBuilder().loadTrustMaterial(null, new TrustSelfSignedStrategy())
 						.loadKeyMaterial(keyStore, "secret".toCharArray()).build());
@@ -559,7 +559,7 @@ public abstract class AbstractServletWebServerFactoryTests {
 		this.webServer = factory.getWebServer();
 		this.webServer.start();
 		KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
-		keyStore.load(new FileInputStream(new File("src/test/resources/test.jks")), "secret".toCharArray());
+		loadStore(keyStore, new FileSystemResource("src/test/resources/test.jks"));
 		SSLConnectionSocketFactory socketFactory = new SSLConnectionSocketFactory(
 				new SSLContextBuilder().loadTrustMaterial(null, new TrustSelfSignedStrategy())
 						.loadKeyMaterial(keyStore, "password".toCharArray()).build());
@@ -592,7 +592,7 @@ public abstract class AbstractServletWebServerFactoryTests {
 		this.webServer = factory.getWebServer();
 		this.webServer.start();
 		KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
-		keyStore.load(new FileInputStream(new File("src/test/resources/test.jks")), "secret".toCharArray());
+		loadStore(keyStore, new FileSystemResource("src/test/resources/test.jks"));
 		SSLConnectionSocketFactory socketFactory = new SSLConnectionSocketFactory(
 				new SSLContextBuilder().loadTrustMaterial(null, new TrustSelfSignedStrategy())
 						.loadKeyMaterial(keyStore, "password".toCharArray()).build());
@@ -630,7 +630,7 @@ public abstract class AbstractServletWebServerFactoryTests {
 		this.webServer = factory.getWebServer();
 		this.webServer.start();
 		KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
-		keyStore.load(new FileInputStream(new File("src/test/resources/test.jks")), "secret".toCharArray());
+		loadStore(keyStore, new FileSystemResource("src/test/resources/test.jks"));
 		SSLConnectionSocketFactory socketFactory = new SSLConnectionSocketFactory(
 				new SSLContextBuilder().loadTrustMaterial(null, new TrustSelfSignedStrategy())
 						.loadKeyMaterial(keyStore, "password".toCharArray()).build());
@@ -1354,9 +1354,14 @@ public abstract class AbstractServletWebServerFactoryTests {
 	private KeyStore loadStore() throws KeyStoreException, IOException, NoSuchAlgorithmException, CertificateException {
 		KeyStore keyStore = KeyStore.getInstance("JKS");
 		Resource resource = new ClassPathResource("test.jks");
-		try (InputStream inputStream = resource.getInputStream()) {
-			keyStore.load(inputStream, "secret".toCharArray());
-			return keyStore;
+		loadStore(keyStore, resource);
+		return keyStore;
+	}
+
+	private void loadStore(KeyStore keyStore, Resource resource)
+			throws IOException, NoSuchAlgorithmException, CertificateException {
+		try (InputStream stream = resource.getInputStream()) {
+			keyStore.load(stream, "secret".toCharArray());
 		}
 	}