Correct way to close nested streams and writers in Java [duplicate]

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When closing chained streams, you only need to close the outermost stream. Any errors will be propagated up the chain and be caught.

Refer to Java I/O Streams for details.

To address the issue

However, if flush() throws a runtime exception for some reason, then out.close() will never be called.

This isn’t right. After you catch and ignore that exception, execution will pick back up after the catch block and the out.close() statement will be executed.

Your colleague makes a good point about the RuntimeException. If you absolutely need the stream to be closed, you can always try to close each one individually, from the outside in, stopping at the first exception.

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