Resource not closed (ARCH4080)

Key java.performance.disposable-not-disposed · Severity error · Category performance

If an AutoCloseable is created and left without calling close(), the resource it owns (file handle, socket, memory) is never released and leaks. Try-with-resources guarantees closure.

Incorrect

public void copy(Path in, Path out) throws IOException {
    InputStream src = Files.newInputStream(in);
    Files.copy(src, out);
}

Correct

public void copy(Path in, Path out) throws IOException {
    try (InputStream src = Files.newInputStream(in)) {
        Files.copy(src, out);
    }
}

Fix

Create resource objects in a try-with-resources block to guarantee they are closed.