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copied!<p>I'm going to assume that you're building an <code>org.w3c.Document</code>, and writing it using a serializer. If you're hand-building an XML string, you're all but guaranteed to be producing something that's almost-but-not-quite XML, and I strongly suggest fixing that first.</p> <p>That said, if you're writing to a stream from the serializer (and System.out is a stream), then you should be writing directly to the stream rather than writing to a string and printing that (which you'd do with a StringWriter). The reason for this is that the XML serializer will properly handle character encodings, while serializer to String to stream may not.</p> <hr> <p>If you're not currently building a DOM, and are concerned about the memory requirements of doing so, then I suggest looking at the Practical XML library (which I maintain), in particular the <a href="http://practicalxml.sourceforge.net/apidocs/net/sf/practicalxml/builder/package-frame.html" rel="nofollow noreferrer">builder</a> package. It uses lightweight nodes, that are then output via a serializer using a SAX transform.</p> <hr> <p>Edit in response to comment:</p> <p>OK, you've got the serializer covered with XStream. I'm next going to assume that you are calling <code>XStream.toXML(Object)</code> to produce the string, and recommend that you call the variant <code>toXML(Object, OutputStream)</code>, and pass it the actual output. The reason for this is that XML is very sensitive to character encoding, which is something that often breaks when converting strings to streams.</p> <p>This may, of course, cause issues with building your POST request, particularly if you're using a library that doesn't provide you an OutputStream.</p>

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