What is @Cleanup used for?

@Cleanup automatically calls a resource's close() method (or another method you specify) at the end of the enclosing block, functioning as a Lombok-era predecessor to Java's built-in try-with-resources for ensuring resources get released.

@Cleanup InputStream in = new FileInputStream("data.txt");
//  Lombok inserts a finally block that calls in.close() at the end of this scope

Since Java 7 introduced try-with-resources as a language feature, @Cleanup is largely historical for closing standard AutoCloseable resources — most modern code reaches for try-with-resources directly instead. It remains occasionally useful for calling a cleanup method that isn't named close(), via @Cleanup("customMethodName"), which try-with-resources can't directly express.

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