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-gradle-plugin/src/main/java/org/springframework/boot/gradle/plugin/ApplicationPluginAction.java

@@ -83,12 +83,11 @@ final class ApplicationPluginAction implements PluginApplicationAction {
 	}
 
 	private String loadResource(String name) {
-		InputStreamReader reader = new InputStreamReader(
-				getClass().getResourceAsStream(name));
-		char[] buffer = new char[4096];
-		int read = 0;
-		StringWriter writer = new StringWriter();
-		try {
+		try (InputStreamReader reader = new InputStreamReader(
+				getClass().getResourceAsStream(name));) {
+			char[] buffer = new char[4096];
+			int read = 0;
+			StringWriter writer = new StringWriter();
 			while ((read = reader.read(buffer)) > 0) {
 				writer.write(buffer, 0, read);
 			}
@@ -97,14 +96,6 @@ final class ApplicationPluginAction implements PluginApplicationAction {
 		catch (IOException ex) {
 			throw new GradleException("Failed to read '" + name + "'", ex);
 		}
-		finally {
-			try {
-				reader.close();
-			}
-			catch (IOException ex) {
-				// Continue
-			}
-		}
 	}
 
 }