DOMParser halts when parse ServletInputStream

Question

Hello everyone,
I am building a system with Web servlet and many clients. Since the clients can be written in C/C++, or Java applet, or simple HTML browser, I use XML to format the data so that the servelt can communicate with any types of clients.
However, it looks to me the DOMParser can not proceed to parse the XML stream in a ServletInputStream. I appreciate anybody's help including Oracel's engineers'.
Here is the sample code for java applet client.
URL url = new URL(serverURL);
HttpURLConnection conn =(HttpURLConnection)url.openConnection();
conn.setRequestMethod("POST");
conn.setRequestProperty("content-type","plain/text");
conn.setDoInput(true);
conn.setDoOutput(true);
OutputStream out = conn.getOutputStream();
PrintStream ps = new PrintStream(out);
String str = "<test></test>";
ps.print(str);
ps.flush();
out.close();
InputStream in = conn.getInputStream();
Since the client uses POST method, the servlet implements
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException
ServletInputStream in = request.getInputStream();
DOMParser parser = new DOMParser();
parser.setValidationMode(false);
parser.showWarnings(false);
parser.parse( in );
XMLDocument doc = parser.getDocument();
The program halts at parser.parse(in). However, if I first read the content of the ServletInputStream and convert it into ByteArrayInputStream, the parser works, which leaves me suspect that ServletInputStream may have some problem.
byte b[] = new byte[1024]; // assume XML data < 1024 bytes.
int count = in.read(b);
ByteArrayInputStream bin = new ByteArrayInputStream(b, 0, count);
DOMParser parser = new DOMParser();
parser.setValidationMode(false);
parser.showWarnings(false);
parser.parse( bin ); // This works!!!
XMLDocument doc = parser.getDocument();
Because most of the time I don't know the size of the ServletInputStream, it is a pain to convert it to ByteArrayInputStream.
Please help!
Jack
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Answer 1

<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by liu9999:
Im having the same issue, where the XMLparser class can not take a ServletInputStream even though it's an InputStream!!?*@#!!.
In my case the ServletInputStream is sourced from the MSXML.send() method of the Microsoft XML parser v 2.0.
Mysteriously, on my local laptop(different than the above machine) with Jrun running on port 8000, this error doesn't occur.
As a side note, the XML stream produced by the microsoft method doesnt contain the xml header/description/version number in its xml document.
Anyway, the workaround was to build a byte array with a length of (ServletInputStream's getContentLength() method), open a ByteArrayInputStream on the byte array and load the Oracle XML parser's parse method with the ByteArrayInputStream - like Jack did.
This seems to be working for me for now. But an extra initialization of memory to work around this issue is not desirable.
If anyone has any info on this "bug" please contact me at [email protected]
Thank you, keep up the good work.
<HR></BLOCKQUOTE>
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