DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder;
builder = factory.newDocumentBuilder();
String xmlfile = "<product><producer>Samsung</producer><model>VH500</model><year>12-12-2004</year></product>";
Document doc = builder.parse(new InputSource(new StringReader(xmlfile)));

DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder;
builder = factory.newDocumentBuilder();
String xmlfile = "<RES NAME=\"ТЕСТ\"><DATA><?xml version=\"1.0\" standalone=\"yes\"?><DATAPACKET Version=\"2.0\"><METADATA><FIELDS><FIELD attrname=\"ID\" fieldtype=\"i4\"/></FIELDS><PARAMS/></METADATA><ROWDATA><ROW ID=\"1\" LAST_NAME=\"TECTОВИЧ\"/>/ROWDATA>
</DATAPACKET></DATA></RES>";
Document doc = builder.parse(new InputSource(new StringReader(xmlfile)));

[Fatal Error] :1:122: The processing instruction target matching "[xX][mM][lL]" is not allowed.
org.xml.sax.SAXParseException: The processing instruction target matching "[xX][mM][lL]" is not allowed.
	at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:249)
	at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:284)