Why do StAX readers and writers not close the underlying input source? [closed]

Question

According to StAX XMLEventReader, XMLEventWriter, XMLStreamReader, XMLStreamWriter API close() method does not close the uderlying resource. Thus this code

XMLInputFactory xf = XMLInputFactory.newInstance();
XMLStreamReader xr = xf.createXMLStreamReader(new FileInputStream("1.xml"));
...
xr.close();

which seems safe at first glance results in a resource leak.

Does anybody know a use case when not closing the underlying resource could be useful?

Answer 1

What comes to mind is socket-based communication, where several XML documents are sent and received, and closing the underlying stream would close the socket.