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Today I had to look at a piece of code a colleague had written, using my XPath Accessor class.

She used it in a servlet which gets XML formatted requests.

SAXParse Exception: Content is not allowed in prolog. Error Handler Wrapper.create SAXParse Exception(Unknown Source) at org.apache. allowed before the XML declaration can be treated as whitespace if the document is handed as a stream of characters to an XML parser rather than as a stream of bytes.

Generally speaking, there are two programming models for working with XML infosets: streaming and the document object model (DOM).

The DOM model involves creating in-memory objects representing an entire document tree and the complete infoset state for an XML document.

If all else fails, open the file in binary to make sure there are no funny characters [3 non printable characters at the beginning of the file that identify the file as utf-8] at the beginning of the file. so we converted the file from utf-8 to ascii and it worked.

File file = new File("c:\\file.xml"); Input Stream input Stream= new File Input Stream(file); Reader reader = new Input Stream Reader(input Stream,"UTF-8"); Input Source is = new Input Source(reader); Encoding("UTF-8"); I followed the instructions found here and i got the same error.

In Java JDK, two built-in XML parsers are available – DOM and SAX, both have their pros and cons.

Here’s few examples to show how to create, modify and read a XML file with Java DOM, SAX, JDOM.

SAX parser is work differently with DOM parser, it does not load any XML document into memory and create some object representation of the XML document.

I was working on Java application recently when I got the following sax.

After the root element is known, it will be read again, this time using the right schema to verify the request. On the net some people claimed that this might be a cause for the error above. This is the relevant code that handles the request: public String read Xml From Stream(Input Source an Input Source) { String t Result = null; try { XPath Accessor reader = new XPath Accessor(an Input Source); String type = reader.xp("root Elem", "req Type"); if (type.starts With("K")) { Schema schema K = Schema(Class() Resource As Stream("/schema/K.xsd")); XPath Accessor validating Reader = new XPath Accessor(an Input Source, schema K); ...public XPath Accessor(Input Source a Source) throws SAXException, IOException, Parser Configuration Exception public XPath Accessor(Input Source a Source, Schema a Schema) throws SAXException, IOException, Parser Configuration Exception Curiously in case of the Servlet no files are involved at all.

Once that is done, some reply is put together and sent back to the client. When I looked at the code I could see nothing wrong. Everything is in memory, so "Premature end of file" is not too helpful anyway.

In addition, updated JAXB example to show you how to convert object to / from XML. It parses an entire XML document and load it into memory, modeling it with Object for easy nodel traversal.

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