Is there any helper method in the JDK or common libraries that does this: if (resource instanceof AutoCloseable) { ((AutoCloseable) resource).close(); } Just a one-liner to call an object's clo...

Autocloseable should always be used with try-with-resources. At least Intellij inspection suggests it. So, if I have a code that produces Foo that implements Autocloseable I should do: try (final ...

Below is the sample code snippet to create SXSSFWorkbook: try(SXSSFWorkbook wb = new SXSSFWorkbook()) { //... } finally { wb.dispose(); //wb not accessible over here, so can't use try with resou...

Java docs of close() method of java.lang.AutoCloseable says Note that unlike the close() method of Closeable, this close() method is not required to be idempotent. In other words, calling this ...

The reader should be closed when a Stream is used in a try-with-resources. Given this: try(Stream<String> lines = new BufferedReader(reader).lines()) { return lines.map(it -> trim ? it....

Background: I use the Java class InitialDirContext to access LDAP directories. Unfortunately, it does not implement interface AutoCloseable, so it cannot be used in try-with-resources blocks. Here...

Consider the following situation : try (ResultSet resultSet = DriverManager.getConnection("jdbc:...", "user", "pass") .createStatement().executeQuery(sql)) { . . ...

I have a java class that holds a Closeable resource internally. This means my class also implements the Closeable interface and closes the internal resource in its own close() method. What is the ...

I read that the catch block in try-with-resources is optional. I've tried creating a Connection object in a try-with-resources block, with no subsequent catch block, only to get compiler error fro...

I'm using CloseableHttpResponse (from apache-httpclient-4.5.3) and I'm not sure I'm using it right, I saw an answer with no votes to use EntityUtils.consume on finally: CloseableHttpResponse...

I am creating a variable amount of AutoCloseable objects in a try-with-resources block. At any point of exit, I want all of the allocated resources closed. I can imagine writing something myself ...

This is a follow-up question from this one. Specifically I'm trying to verify correct use of an API which involves calling close() on Java objects holding heavy native resources over JNI. To re-it...

I am authoring a java library. Some of the classes that are meant to be used by library users, hold native system resources (over JNI). I'd like to ensure that the user "disposes" these objects, as...

It can be handy to time code execution so you know how long things take. However, I find the common way this is done sloppy since it's supposed to have the same indentation, which makes it harder t...

I am looking at examples of try-with-resources in Java and I understand the following one: try (Connection conn = DriverManager.getConnection(url, user, pwd); Statement stmt = conn.createStatemen...

If I want to automatically close a resource passed as an argument, is there a more elegant solution than this? void doSomething(OutputStream out) { try (OutputStream closeable = out) { // do so...

I know that the resource you pass with a try, will be closed automatically if the resource has AutoCloseable implemented. So far so good. But what do I do when i have several resources that I want ...

These "resource leak" warnings I'm getting in Eclipse for AutoCloseables seem to be a life-saver. However, how do I get them to work for factory created instances? For example (a works, but b doe...

I am new in Java8, and I want to know if, for the AutoCloseable resource, I have to add a try for each resource, or it will work with the code above try (Connection conn = getConnection();) ...

Looking at the quick start guide it gives the following code example: CloseableHttpClient httpclient = HttpClients.createDefault(); HttpGet httpGet = new HttpGet("http://targethost/homepage"); Clo...

Kotlin provides the use function for Closeable objects, but it seems they forgot to consider AutoCloseable (e.g. DB prepared statements) for the try-with-resources full Java equivalent. I've imple...

When I compile my project, I am getting this error: trouble processing java/lang/AutoCloseable.class Please help me sort this out.

Today I tried to refactor this code, that reads ids from files in a directory, Set<Long> ids = new HashSet<>(); for (String fileName : fileSystem.list("my-directory")) { InputSt...

My team has quite a huge amount of code. Recently I have found some objects that weren't closed properly. How can i find all the instances that are not closed or not inside a try-with-resources blo...

When implementing an AutoCloseable to work with the Java 7 try-with-resources statement, I would like to know if there had been an exception within the try block. E.g.: class C implements AutoClos...