SAXParseException from parser.parse()

Question

Hi,
I am using xml on http sample code with xerces-123 and I get I get
"SAXParseException: The root element is required in a well-formed document."
on the parser.parse(...) line. Yes, the XML is well-formed. I also try to
use a well-formated xml file, but that exception is still there.
import org.w3c.dom.*;
import org.apache.xerces.*;
import org.apache.xerces.dom.*;
import org.apache.xerces.parsers.*;
import org.apache.xml.serialize.*;
import org.xml.sax.*;
import java.net.*;
import java.io.*;
class XmlBridge {
private String sURI;
public XmlBridge(String serverURI) {
sURI = serverURI;
public Document sendRequest(Document doc) {
Document docOut = null;
try {
URL url = new URL("http://" + sURI);
HttpURLConnection conn =
(HttpURLConnection)
url.openConnection();
conn.setDoInput(true);
conn.setDoOutput(true);
OutputStream out =
conn.getOutputStream();
XMLSerializer ser =
new XMLSerializer(out,
new OutputFormat("xml",
"UTF-8", false));
ser.serialize(doc);
out.close();
DOMParser parser = new DOMParser();
parser.parse(new
InputSource(conn.getInputStream()));
docOut = parser.getDocument();
} catch (Throwable e) {
e.printStackTrace();
return docOut;
public static void main(String[] args) {
try {  // Build up an XML Document
Document docIn = new DocumentImpl();
Element e =
docIn.createElement("Order");
e.appendChild(docIn.createElement(
"Type"));
e.appendChild(docIn.createElement(
"Amount"));
docIn.appendChild(e);
// Send it to the Servlet
XmlBridge a =
new XmlBridge(args[0]);
Document docOut =
a.sendRequest(docIn);
// Debug - write the sent
//Document to stdout
XMLSerializer ser =
new XMLSerializer(System.out,
null);
ser.serialize(docOut);
} catch (Throwable e) {
e.printStackTrace();
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import org.w3c.dom.*;
import org.xml.sax.*;
import org.apache.xerces.*;
import org.apache.xerces.dom.*;
import org.apache.xerces.parsers.*;
import org.apache.xml.serialize.*;
public abstract class XmlServlet
extends GenericServlet {
protected abstract Document
doRequest(Document req);
public XmlServlet() {}
public void service(ServletRequest
req, ServletResponse res)
throws ServletException {
try {
DOMParser parser =
new DOMParser();
//problem here
parser.parse(new InputSource(
req.getInputStream()));
Document docOut =
doRequest(
parser.getDocument());
XMLSerializer ser =
new XMLSerializer(
res.getOutputStream(),
new OutputFormat("xml",
"UTF-8", false));
ser.serialize(docOut);
res.getOutputStream().close();
} catch (Throwable e) {
e.printStackTrace();
I use VCafe to bebug the xmlservlet. For some reason in line
parser.parse(new InputSource(req.getInputStream())), parse() method is
frozen and stop running. Is anyone has some solution or experience on this
problem. Any help will be appreciated.
DJ

Answer 1

I fix this problem by upgrade to sp8. But why?
"Cameron Purdy" <[email protected]> wrote in message
news:[email protected]...
1. It will freeze if it can't read from the input stream. Read is a
blocking call.
2. It may be in your code since it calls you for each piece. Use
Ctrl-Break to get a thread dump (kill -3 on Unix).
Cameron Purdy
Tangosol, Inc.
http://www.tangosol.com
+1.617.623.5782
WebLogic Consulting Available
"David Jian" <[email protected]> wrote in message
news:[email protected]...
Hi,
I am using xml on http sample code with xerces-123 and I get I get
"SAXParseException: The root element is required in a well-formeddocument."
on the parser.parse(...) line. Yes, the XML is well-formed. I also try
to
use a well-formated xml file, but that exception is still there.
import org.w3c.dom.*;
import org.apache.xerces.*;
import org.apache.xerces.dom.*;
import org.apache.xerces.parsers.*;
import org.apache.xml.serialize.*;
import org.xml.sax.*;
import java.net.*;
import java.io.*;
class XmlBridge {
private String sURI;
public XmlBridge(String serverURI) {
sURI = serverURI;
public Document sendRequest(Document doc) {
Document docOut = null;
try {
URL url = new URL("http://" + sURI);
HttpURLConnection conn =
(HttpURLConnection)
url.openConnection();
conn.setDoInput(true);
conn.setDoOutput(true);
OutputStream out =
conn.getOutputStream();
XMLSerializer ser =
new XMLSerializer(out,
new OutputFormat("xml",
"UTF-8", false));
ser.serialize(doc);
out.close();
DOMParser parser = new DOMParser();
parser.parse(new
InputSource(conn.getInputStream()));
docOut = parser.getDocument();
} catch (Throwable e) {
e.printStackTrace();
return docOut;
public static void main(String[] args) {
try {  // Build up an XML Document
Document docIn = new DocumentImpl();
Element e =
docIn.createElement("Order");
e.appendChild(docIn.createElement(
"Type"));
e.appendChild(docIn.createElement(
"Amount"));
docIn.appendChild(e);
// Send it to the Servlet
XmlBridge a =
new XmlBridge(args[0]);
Document docOut =
a.sendRequest(docIn);
// Debug - write the sent
//Document to stdout
XMLSerializer ser =
new XMLSerializer(System.out,
null);
ser.serialize(docOut);
} catch (Throwable e) {
e.printStackTrace();
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import org.w3c.dom.*;
import org.xml.sax.*;
import org.apache.xerces.*;
import org.apache.xerces.dom.*;
import org.apache.xerces.parsers.*;
import org.apache.xml.serialize.*;
public abstract class XmlServlet
extends GenericServlet {
protected abstract Document
doRequest(Document req);
public XmlServlet() {}
public void service(ServletRequest
req, ServletResponse res)
throws ServletException {
try {
DOMParser parser =
new DOMParser();
//problem here
parser.parse(new InputSource(
req.getInputStream()));
Document docOut =
doRequest(
parser.getDocument());
XMLSerializer ser =
new XMLSerializer(
res.getOutputStream(),
new OutputFormat("xml",
"UTF-8", false));
ser.serialize(docOut);
res.getOutputStream().close();
} catch (Throwable e) {
e.printStackTrace();
I use VCafe to bebug the xmlservlet. For some reason in line
parser.parse(new InputSource(req.getInputStream())), parse() method is
frozen and stop running. Is anyone has some solution or experience onthis
problem. Any help will be appreciated.
DJ