Parsing xml from a socket stream

Hi,
I'm working on a client/server program, and I have the following problem. I'd like the client to send an xml-string to the server, and then the server to parse it (using SAX). The problem is, I cannot get the server to work.
I thought the following would work, but it doesn't:
InputSource xmlIn = new InputSource(socket.getInputStream());
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser xmlReader = factory.newSAXParser();
DefaultHandler handler = new MyHandler(); //
xmlReader.parse(xmlIn, handler);
The setup now is, that the user of the client program can type something in the command line, press enter and the string is then sent to the server, which should parse it, but doesn't (instead gives a nullpointer exc.)
Does anybody know how to parse an incoming string like this?
thnx in advance,
KS

The parser expects to read to the end of the stream. If you closed the stream right after you wrote to it, I bet it would work. You wouldn't want to close the stream though would you? Try sending the string using a DataOuputStream and calling DataOutputStream.writeUTF(String) on the client side. Then, on the server side call String str = in.readUTF() (where 'in' is a DataInputStream). Then wrap the string in a StringReader and give the StringReader to the parser as it's input source.

Similar Messages

Parsing XML from a socket that does not close

Hi -
I've seen similar questions to this already posted, but either they did not really apply to my situation or they were not answered.
I have to read messages from a server and process them individually, but the protocol does not indicate the message length or give any sort of terminating character. You only know you have a complete message because it will be a well formed XML fragment. To complicate matters more, there could be extra binary data preceding each XML message. I must stress that I did not write this server, and I have no influence over the protocol at all, so while I certainly agree that this is not such a good protocol, changing it is not an option.
I'm hoping that there is a reasonable way to deal with this with an existing parser. Ironically, I don't really need to parse the XML at all, I just need to know when the current message is over but the only indication I get is that it will be the end of an XML fragment.
I do have the ability to strip off the non-XML binary data, so if there is some way that I can give the stream to a SAX (or other) parser when I know XML is coming and have it inform me when tags begin and end, or ideally inform me when it is done a complete XML fragment, that would be perfect. I'm aware of how to do this using SAX normally, but it seems that it will not function correctly when there is no EOF or other indication that the document has ended.
The best algorithm I have come up with (and it's pretty cheesy) is:
1. Start with a string buffer.
2. Append data from the socket to the buffer one byte at a time.
3. Keep checking if there is a '<' character that is not followed by '?' or '!'. (ie - don't concern myself with the special XML elements that don't close with '/>' or </tagName>. I keep them in the buffer to pass on when I'm done though.)
4. When I get my first tag with <tagName> I make note of what this tag is and increment a counter. If the tag is self closing, then I'm done.
5. Anytime I see this tag I increment the counter.
6. Anytime I see </tagName> I decrement the counter. If the counter = 0, I am done.
7. I pass on the entire message, preceding binary data, special XML tags and the fragment to the module that actually processes it.
This has a few problems. I'll have to go out of my way to support multiple character encodings, I'll have to be careful to catch all the special XML tags, and its quite CPU intensive to be interested in every single character that comes down the pipe (but I suppose this is not avoidable). Also, I just don't like to re-invent the wheel because I'm likely to make an error that a well established parser would not make.
Does anyone have any suggestions for this, or know of a parser that will deal with fragments using streams that don't close?
Thanks!

The parser expects to read to the end of the stream. If you closed the stream right after you wrote to it, I bet it would work. You wouldn't want to close the stream though would you? Try sending the string using a DataOuputStream and calling DataOutputStream.writeUTF(String) on the client side. Then, on the server side call String str = in.readUTF() (where 'in' is a DataInputStream). Then wrap the string in a StringReader and give the StringReader to the parser as it's input source.

Parsing XML from Socket input stream

I create a sax parser to which I send the InputStream from the socket
But my HandlerBase never gets the events. I get startDocument
but that is it, I never get any other event.
The code I have works just like expected when I make the InputStream
come from a file. The only differeence I see is that when I file is used the
InputStream is fully consumed while with the socket the InputStream
is kept open (I MUST KEEP THE SOCKET OPEN ALL THE TIME). If the parser
does not generate the events unless the InputStream is fully consumed,
isn't that against the whole idea of SAX (sax event driven) .
Has anyone been succesfull parsing XML from the InputStream of a socket?
if yes how?
I am using JAXP 1.0.1 but I can upgrade to JAXP 1.1.0
which uses SAX 2.0
Does anybody know if my needs can be met by JAXP 1.1.0?
Thanks

I did the same with client/server model.
I have client program with SAX parser. Please try if you can make the server side. I was be able to write the program with help from this forum. Please search to see if you can get the forum from which I got help for this program.
// JAXP packages
import javax.xml.parsers.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;
// JAVA packages
import java.util.*;
import java.io.*;
import java.net.*;
public class XMLSocketClient {
final private static int buffSize = 1024*10;
final private static int PORTNUM = 8888;
 final private static int threadSleepValue = 1000;
private static void usage() {
System.err.println("Usage: XMLSocketClient [-v] serverAddr");
System.err.println(" -v = validation");
System.exit(1);
public static void main(String[] args) {
String address = null;
boolean validation = false;
Socket socket = null;
InputStreamReader isr_socket = null;
BufferedReader br_socket = null;
CharArrayReader car = null;
BufferedReader br_car = null;
char[] charBuff = new char[buffSize];
int in_buff = 0;
* Parse arguments of command options
for (int i = 0; i < args.length; i++) {
if (args.equals("-v")) {
validation = true;
} else {
address = args[i];
// Must be last arg
if (i != args.length - 1) {
usage();
// Initialize the socket and streams
try {
socket = new Socket(address, PORTNUM);
isr_socket = new InputStreamReader(socket.getInputStream());
br_socket = new BufferedReader(isr_socket, buffSize);
catch (IOException e) {
System.err.println("Exception: couldn't create stream socket "
+ e.getMessage());
System.exit(1);
* Check whether the buffer has input.
try {
while (br_socket.ready() != true) {
 try {
 Thread.currentThread().sleep(threadSleepValue);
 catch (InterruptedException ie) {
 System.err.println("Interrupted error for sleep: "+ ie.getMessage());
 System.exit(1);
catch (IOException e) {
System.err.println("I/O error for in.read(): "+ e.getMessage());
System.exit(1);
try {
in_buff = br_socket.read(charBuff, 0, buffSize);
System.out.println("in_buff = " + in_buff);
System.out.println("charBuff length: " + charBuff.length);
if (in_buff != -1) {
System.out.println("End of file");
} catch (IOException e) {
System.out.println("Exception: " + e.getMessage());
System.exit(1);
System.out.println("reading XML file:");
StringBuffer display = new StringBuffer();
display.append(charBuff, 0, in_buff);
System.out.println(display.toString());
* Create BufferedReader from the charBuff
* in order to put into XML parser.
car = new CharArrayReader(charBuff, 0, in_buff); // these two lines have to be here.
br_car = new BufferedReader(car);
* Create a JAXP SAXParserFactory and configure it
* This section is standard handling of XML document by SAX XML parser.
SAXParserFactory spf = SAXParserFactory.newInstance();
spf.setValidating(validation);
XMLReader xmlReader = null;
try {
// Create a JAXP SAXParser
SAXParser saxParser = spf.newSAXParser();
// Get the encapsulated SAX XMLReader
xmlReader = saxParser.getXMLReader();
} catch (Exception ex) {
System.err.println(ex);
System.exit(1);
// Set the ContentHandler of the XMLReader
xmlReader.setContentHandler(new MyXMLHandler());
// Set an ErrorHandler before parsing
xmlReader.setErrorHandler(new MyErrorHandler(System.err));
try {
* Tell the XMLReader to parse the XML document
xmlReader.parse(new InputSource(br_car));
} catch (SAXException se) {
System.err.println(se.getMessage());
System.exit(1);
} catch (IOException ioe) {
System.err.println(ioe);
System.exit(1);
* Clearance of i/o functions after parsing.
try {
br_socket.close();
} catch (IOException e) {
System.out.println("Exception: " + e.getMessage());
try {
socket.close();
} catch (IOException e) {
System.out.println("Exception: " + e.getMessage());
try {
br_car.close();
} catch (IOException e) {
System.out.println("Exception: " + e.getMessage());
* The XML handler used by this program
class MyXMLHandler extends DefaultHandler {
// A Hashtable with tag names as keys and Integers as values
private Hashtable tags;
// Parser calls this once at the beginning of a document
public void startDocument() throws SAXException {
System.out.println("startDocument()");
tags = new Hashtable();
// Parser calls this for each element in a document
public void startElement(String namespaceURI, String localName,
String rawName, Attributes atts)
throws SAXException
String key = localName;
Object value = tags.get(key);
System.out.println("startElement()");
System.out.println("namespaceURI: " + namespaceURI);
System.out.println("localName: " + localName);
System.out.println("rawName: " + rawName);
if (value == null) {
// Add a new entry
tags.put(key, new Integer(1));
} else {
// Get the current count and increment it
int count = ((Integer)value).intValue();
count++;
tags.put(key, new Integer(count));
// Parser calls this once after parsing a document
public void endDocument() throws SAXException {
Enumeration e = tags.keys();
System.out.println("endDocument()");
while (e.hasMoreElements()) {
String tag = (String)e.nextElement();
int count = ((Integer)tags.get(tag)).intValue();
System.out.println("Tag <" + tag + "> occurs " + count
+ " times");
* Error handler of XML parser to report errors and warnings
* This is standard handling.
class MyErrorHandler implements ErrorHandler {
/** Error handler output goes here */
private PrintStream out;
MyErrorHandler(PrintStream out) {
this.out = out;
* Returns a string describing parse exception details
private String getParseExceptionInfo(SAXParseException spe) {
String systemId = spe.getSystemId();
if (systemId == null) {
systemId = "null";
String info = "URI=" + systemId +
" Line=" + spe.getLineNumber() +
": " + spe.getMessage();
return info;
* The following methods are standard SAX ErrorHandler methods.
* See SAX documentation for more info.
public void warning(SAXParseException spe) throws SAXException {
out.println("Warning: " + getParseExceptionInfo(spe));
public void error(SAXParseException spe) throws SAXException {
String message = "Error: " + getParseExceptionInfo(spe);
throw new SAXException(message);
public void fatalError(SAXParseException spe) throws SAXException {
String message = "Fatal Error: " + getParseExceptionInfo(spe);
throw new SAXException(message);

Can't parse xml from applet using dom on linux on Netscape 7 using jre 1.4.

Hi,
I can't seem to parse xml from an applet on linux on Netscape 7 using the JRE 1.4.
My code looks like the following:
StringBufferInputStream is = new StringBufferInputStream("<foo></foo>");
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = null;
try
 builder = factory.newDocumentBuilder();
 domDocument = builder.parse(is); // this line creates an exception
catch (Exception e)
 System.out.println(e);
This code works fine from an applet on windows. On linux, the error message is:
java.security.AccessControlException: access denied (java.util.PropertyPermission entityExpansionLimit read)
I've tried both JRE 1.4.0_04 and 1.4.1_03
Thanks!
Q

There's another posting about this same problem (platform unspecified), but the same error message. I was also having this problem (Windows 1.4.03) and swithced back to 1.4.01 and the problem went away. In the future, I may sign my applets to get a more generous security policy. But, I'm sure it'll be a lot of work (vs. a line of code somewhere).

Parse XML from CLOB field

How can I parse XML from CLOB field? I need to replace or delete the node from XML document and update the database with new XML. I am using Oracle 9i release 2.
Here is the XML. In this XML if section1 and section2 exists then I need to delete the section1 node. If section2 doesn't exist, replace section1 with section2 node.
<Document ID='2' TypeID='2'>
<Body>
<Page Name='Page1'>
<Sec ID='section1' Title='Section 1' GroupID='' />
<Sec ID='section2' Title='Section 2' GroupID='' />
</Page>
</Body>
</Document>
Please help.. Thank you..

In 9.2, you are limited into your options. Have a look into, among others, updateXML. Updating tp 10gR2 will give you more options to succeed.

Reading text from server socket stream

I have a basic cd input program i've been trying to figure out the following problem for a while now, the user enters the artist and title etc and then a DOM (XML) file is created in memory this is then sent to the server. The server then echos back the results which is later printed on a html page by reading the replys from the server line by line.
The server must be run it listens for clients connecting the clients connect and send DOM documents through the following jsp code.
<%@page import="java.io.*"%>
<%@page import="java.net.*"%>
<%@page import="javax.xml.parsers.*"%>
<%@page import="org.w3c.dom.*"%>
<%@page import="org.apache.xml.serialize.*"%>
<%!
 public static final String serverHost = "cdserver";
 public static final int serverPort = 10151;
%>
<hr />
<pre>
<%
 Socket mySocket = null; // socket object
 PrintWriter sockOut = null; // to send data to the socket
 BufferedReader sockIn = null; // to receive data from the socket
 try {
 // #1 add line that creates a client socket
 mySocket = new Socket(serverHost, serverPort);
 // #2 add lines that create input and output streams
 // attached to the socket you just created
 sockOut = new PrintWriter(mySocket.getOutputStream(), true);
 sockIn = new BufferedReader(new InputStreamReader(mySocket.getInputStream()));
 } catch (UnknownHostException e) {
 throw e; // This time the JSP can handle the exception, not us
 } catch (IOException e) {
 throw e; // This time the JSP can handle the exception, not us
String cdTitle, cdArtist, track1Title, track1Time, track1Rating;
// Retrieve the HTML form field values
cdTitle = request.getParameter("cdtitle");
cdArtist = request.getParameter("cdartist");
track1Title = request.getParameter("track1title");
track1Time = request.getParameter("track1time");
track1Rating = request.getParameter("track1rating");
// Create a new DOM factory, and from that a new DOM builder object
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
// Note that we are creating a new (empty) document
Document document = builder.newDocument();
// The root element of our document wil be <cd>
// It gets stored as the child node of the whole document (it is the root)
Element rootElement = document.createElement("cd");
document.appendChild(rootElement);
// Create an element for the CD title called <title>
Element cdTitleElement = document.createElement("title");
// Add a text code under the <title> element with the value that
// the user entered into the title field of the web form (cdTitle)
cdTitleElement.appendChild(document.createTextNode(cdTitle));
// Place the <title> element underneath the <cd> element in the tree
rootElement.appendChild(cdTitleElement);
// Create an <artist> element with the form data, place underneath <cd>
Element cdArtistElement = document.createElement("artist");
cdArtistElement.appendChild(document.createTextNode(cdArtist));
rootElement.appendChild(cdArtistElement);
// Create a <tracklist> element and place it underneath <cd> in the tree
// Note that it has no text node associated with it (it not a leaf node)
Element trackListElement = document.createElement("tracklist");
rootElement.appendChild(trackListElement);
// In this example we only have one track, so it is not necessary to
// use a loop (in fact it is quite silly)
// But the code below is included to demonstrate how you could loop
// through and add a set of different tracks one by one if you
// needed to (although you would need to have the track data already
// stored in an array or a java.util.Vector or similar
int numTracks = 1;
for (int i=0; i<numTracks; i++) {
String trackNum = Integer.toString(i+1);
Element trackElement = document.createElement("track");
trackElement.setAttribute("id", trackNum);
trackListElement.appendChild(trackElement);
// Track title element called <title>, placed underneath <track>
Element trackTitleElement = document.createElement("title");
trackTitleElement.appendChild(document.createTextNode(track1Title));
trackElement.appendChild(trackTitleElement);
// Track time element called <time>, placed underneath <track>
Element trackTimeElement = document.createElement("time");
trackTimeElement.appendChild(document.createTextNode(track1Time));
trackElement.appendChild(trackTimeElement);
// Track rating element called <rating>, placed underneath <track>
Element trackRatingElement = document.createElement("rating");
trackRatingElement.appendChild(document.createTextNode(track1Rating));
trackElement.appendChild(trackRatingElement);
OutputFormat format = new OutputFormat();
format.setIndenting(true);
// Create a new XMLSerializer that will be used to write out the XML
// This time we will serialize it to the socket
// #3 change this line so that it serializes to the socket,
// not to the "out" object
XMLSerializer serializer = new XMLSerializer(writer, format);
serializer.serialize(document);
 // Print out a message to indicate the end of the data, and
 // flush the stream so all the data gets sent now
 sockOut.println("");
 sockOut.flush();
 BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
 String fromServer;
 String fromUser;
 #4 add a while loop that reads text from the
 server socket input stream, line by line, and prints
 it out to the web page, using out.println(...);
 Note that because the reply from the server will contain
 XML, you will need to call upon the toHTMLString() method
 defined below to escape the < and > symbols so that they
 will display correctly in the web browser.
 Also note that as you receive the reply back from the
 server, you should look out for the special 
 string that will indicate when there is no more data
 to receive.
 while ((fromServer = sockIn.readLine()) != null) {
 out.println(sockIn.readLine());
 // If the reply from the server said "QUIT", exit from the
 // while loop by using a break statement.
 if (fromServer.equals("QUIT")) {
 out.println("Connection closed - good bye ...");
 // Print the text from the server out to the user's screen
 out.println("Reply from Server: " + fromServer);
 // Now read a line of text from the keyboard (typed by user)
 fromUser = stdIn.readLine();
 // If it wasn't null, print it out to the screen, and also
 // print a copy of it out to the socket
 if (fromUser != null) {
 out.println("Client: " + fromUser);
 sockOut.println(fromUser);
 // Close all the streams we have open, and then close the socket
 sockOut.close();
 sockIn.close();
 mySocket.close();
%>
I'm suppose to modify the commented sections labled with #.
#1,2 are correct but i have doubts on the 3rd and 4th modification.
for #3 i changed so i serializes to the socket not to the "out" object:
from
XMLSerializer serializer = new XMLSerializer(out, format);
to
XMLSerializer serializer = new XMLSerializer(writer, format);
with "out" it prints out some of the results entered but it just hangs i'm thinking it might be the while loop that i added in #4. If i changed it to serialize the socket XMLSerializer serializer = new XMLSerializer(writer, format); it doesn't print out nothing at all; just a blank screen where it hangs.
I can post the rest of the code (server thats in java and cdinput.html) but since i want to keep my post short and if required i'll post it later on i also omitted some of the code where it creates the DOM textnodes etc to keep my post short.

On your previous thread, why did you say the server was using http POST and application/xml content type when it quite obviously isn't, but a direct socket communication that abuses XML comments for message end delimiters?
The comments imply you need to wait for "" on a line by itself, but your loop is waiting for "QUIT".
Pete

Parsing XML from a session bean

Hi,
I am trying to use a Sax parser for parsing xml received from a back end
legacy system. The code is executed from a Session bean.
Debugging learned me that the parse() method on the parser hangs the
container without any error or exception trace. The code works fine outside
a container.
All help will be highly appreciated.
Kurt

I found out that the InputStream implementation used parsing source inside
the container is different
then from the one outside (other type of VM of course!). The Weblogic
implementation blocks at the end of
the stream, while the normal SUN JDK 1.3 returns. This is not a bug, the bug
I found is in my proxy that allows
the connection to the backend. This proxy allows HTTP connections, and I
parse the XML received over HTTP.
Regards,
Kurt
"Todd Karakashian" <[email protected]> wrote in message
news:[email protected]..
That's seems odd. Perhaps there is something going on in your document
handler code that triggers a hang in the environment of the server.
When you see the hang, instruct the VM to give you a thread dump (type
control-<break> on Windows, <control>-\ (backslash) on UNIX in the
window in which the server is running; the results are dumped to
stderr). That will show what every thread in the server is doing. If you
email or post the thread dump, I will take a look at it and see if I can
see what is going on. Also, let us know which platform, VM, parser, and
WebLogic version you are using.
Regards,
-Todd
Kurt Quirijnen wrote:
Hi,
I am trying to use a Sax parser for parsing xml received from a back end
legacy system. The code is executed from a Session bean.
Debugging learned me that the parse() method on the parser hangs the
container without any error or exception trace. The code works fine
outside
a container.
All help will be highly appreciated.
Kurt--
Todd Karakashian
BEA Systems, Inc.
[email protected]

Xerces - Parse XML from String

I am trying to parse an xml string using Xerces.
I have the following code:
String xml = <segments meters="8643" seconds="538" distance="5.4 mi" time="8 mins"><segment id="seg0" pointIndex="0" meters="122" seconds="11" distance="0.1 mi" time="11 secs">Head southwest from B Ave NE
</segment>
<segment id="seg1" pointIndex="2" meters="239" seconds="22" distance="0.1 mi" time="21 secs">Turn left at 19th St NE</segment>
<segment id="seg2" pointIndex="5" meters="2985" seconds="192" distance="1.9 mi" time="3 mins">Turn right at 1st Ave NE</segment>
<segment id="seg3" pointIndex="43" meters="3280" seconds="211" distance="2.0 mi" time="3 mins">Continue on 1st Ave SW/1st Ave NW</segment>
<segment id="seg4" pointIndex="96" meters="158" seconds="10" distance="0.1 mi" time="10 secs">Bear right at US-151-BR S</segment>
<segment id="seg5" pointIndex="102" meters="1859" seconds="93" distance="1.2 mi" time="1 min">Turn right at 16th Ave SW</segment>;
XMLReader reader = new SAXParser();
reader.setContentHandler(new Handler());
reader.parse(xml);I am getting the followoing error:
org.xml.sax.SAXParseException: File "<segments meters="8643" seconds="538" distance="5.4 mi" time="8 mins"><segment id="seg0" pointIndex="0" meters="122" seconds="11" distance="0.1 mi" time="11 secs">Head southwest from B Ave NE</segment><segment id="seg1" pointIndex="2" meters="239" seconds="22" distance="0.1 mi" time="21 secs">Turn left at 19th St NE</segment><segment id="seg2" pointIndex="5" meters="2985" seconds="192" distance="1.9 mi" time="3 mins">Turn right at 1st Ave NE</segment><segment id="seg3" pointIndex="43" meters="3280" seconds="211" distance="2.0 mi" time="3 mins">Continue on 1st Ave SW/1st Ave NW</segment><segment id="seg4" pointIndex="96" meters="158" seconds="10" distance="0.1 mi" time="10 secs">Bear right at US-151-BR S</segment><segment id="seg5" pointIndex="102" meters="1859" seconds="93" distance="1.2 mi" time="1 min">Turn right at 16th Ave SW</segment></segments>" not found.
 at org.apache.xerces.framework.XMLParser.reportError(XMLParser.java:1219)
 at org.apache.xerces.readers.DefaultEntityHandler.startReadingFromDocument(DefaultEntityHandler.java:501)
 at org.apache.xerces.framework.XMLParser.parseSomeSetup(XMLParser.java:314)
 at org.apache.xerces.framework.XMLParser.parse(XMLParser.java:1097)
 at org.apache.xerces.framework.XMLParser.parse(XMLParser.java:1139)
 at com.shiftyeyes.xmlTest.main(xmlTest.java:34)
Exception in thread "main" anyone know how I can fix this? Thanks!!

reader.parse(new InputSource(new StringReader(xml)));

How to use DOMParser from an Applet / Or, how to parse XML from an Applet?

Hey,
As stating in the subject line, I wonder how to do it without getting an �Access Denied� error.
I would like to parse a XML file that has external DTD pointing to a SYSTEM location. Yes, I can change it to a public location. However, in either way, I have problems to use DOMBuilder to parse the xml file. The application always throws the security exception.
I tried to use the DOMParser from org.apache.xerces.parsers to parse the xml file. I set the DOMParser to ignore parsing the external DTD, and use the DOMParser.parse(InputSource) to parse the xml file from a giving URL. However, I get null of the result document.
Does anyone know how to parse the XML from an Applet? Or, does anyone know how to use the DOMParser from an Applet?
Thank you very much,

If the document resides on the local filesystem, you will need to sign a CAB or JAR for the applet to circumvent the sandbox's security restrictions. There are dozens of posts on how to do this. Basically, that will turn the applet into an application, from a Java security perspective.
- Saish
"My karma ran over your dogma." - Anon

How to get server data without reading from the socket stream?

My socket client checks for server messages through
            while (isRunning) { //listen for server events
                try {
                        Object o = readObject(socket); //wait for server message
                            tellListeners(socket, o);
                } catch (Exception e) {
                    System.err.println("ERROR SocketClient: "+e);
                    e.printStackTrace();
                try { sleep(1000); } catch (InterruptedException ie) { /* ignore */ }
            }//next client connectionwith readObject() being
    public Object readObject(Socket socket) throws ClassNotFoundException, IOException {
        Object result = null;
System.out.println("readObject("+socket+") ...");
        if (socket != null && socket.isConnected()) {
//            ObjectInputStream ois = new ObjectInputStream(socket.getInputStream());
            ObjectInputStream ois = new ObjectInputStream(new DataInputStream(socket.getInputStream()));
            try {
                result = ois.readObject();
            } finally {
//                socket.shutdownInput(); //closing of ois also closes socket!
    //            try { ois.close(); } catch (IOException ioe) { /* ignore */ }
        return result;
    }//readObject()Why does ois.readObject() block? I get problems with this as the main while loop (above) calls readObject() as it's the only way to get server messages. But if i want to implement a synchronous call in adition to this asynchronous architecture (call listeners), the readObject() call of the synchronous method comes to late as readObject() call of the main loop got called before and therefore also gets the result of the (later) synchronous call.
I tried fideling around with some state variables, but that's ugly and probably not thread safe. I'm looking for another solution to check messages from the server without reading data from the stream. is this possible?

A quick fix:
- Add a response code at the beginning of each message returned from the server indicating if the message is a synchronous response or a callback (asynch);
- Read all messages returned from the server in one thread and copy callback messages in a calback message queue and the synch responses in an synch responses queue;
- Modify your synchronous invocation to retrieve the response from the responses queue instead from the socket. Read the callback messages from the corresponding queue instead from the socket.
Also take a look at my website. I'm implementing an upgraded version of this idea.
Catalin Merfu
High Performance Java Networking
http://www.accendia.com

Parsing xml from forms6i,can anyone please help me

Can anyone please help me.I need to parse a xml file from a directory.The parsing should help me in giving a structure for two things.
1) i should be able to read the nodes( values between the tags) and display the values at my front-end textboxex
2) whenever the user changes the front-end content it should change the corresponding value in the xml node.
when it is finished i should be able to save the structure back as a xml file.This file is actually a blob object in the oracle database and is it wise to convert it into a file in dos directory and parse it from there or use oracle utilities from form6i and parse it from oracle utilities.
Please if someone can find help on this ,it would really help me.

No the password isn't your apple id password.
You encrypted your backup with a password, if you don't remember the password, then i'm sorry you won't be able to use it.

Parsing XML from a String

I have a servlet, this recieves an XML file from the client as a file input type from a html form. This XML is wrapped up in http headers and stuff. I parse the input stream from the client's http request to get a string containing the xml. This is fine.
How do I now build an XML document from this string? The DocumentBuilder will take in files and InputStreams but I can't find anything that helps me?
The only solution I've come up with is to write out the string to a temp file and then parse it back into a Document.
Any ideas anyone?????

Document doc = documentBuilder.parse(new InputSource(new StringReader(yourXMLString)));
voila!

Parsing XML from ZipInputStream

I am reading a large XML file directly from a zipEntry. When I run this it appears to only send the parser one chunck of data. Once it parses that first read from my inputstream, it abend with an "empty String" error. I have been looking around the net for examples and it's starting to appear like I am the first person in the world to attempt this. Please Help!!!! I have included my code for anyone to look at.
ZipFile zf = new ZipFile(parsefile);
Enumeration zipEnum = zf.entries();
     ZipEntry ze = (ZipEntry) zipEnum.nextElement();
     System.out.println(ze.getName() + ", " +
ze.getCompressedSize() + ", " +
ze.getSize() );
     seh = new SAXRptEventHandler();
     xmlIn = new org.xml.sax.InputSource(zf.getInputStream(ze));
xmlIn.setSystemId("/tsyd/tsydmt2/data/ReportExtract.dtd");
XMLReader parser = (XMLReader)Class.forName
     ("org.apache.xerces.parsers.SAXParser").newInstance();
     parser.setContentHandler(seh);
     parser.setErrorHandler(seh);
     parser.parse(xmlIn);
     zf.close();

I got the DTD working from watching other posts on here. I did use the entityResolver and it works perfect. I am having the similar problem that I've seen elsewhere in that my parser will just stop receiving data. My output file is always the same size. I am trying to figure out now if my input stream needs something else or if this might be a system problem. I never did see a resolution to other people who said their parser stops working when they use an inputstream.
any help or advice is always appreciated.

Urgent : Need help in parsing XML from Sharepoint and save it into DB

Hi ,
I am Sharepoint guy and a newbie in Oracle . PL/SQL
I am using UTL_DBWS Package to call a Sharepoint WebService " and was sucessfull , Now the xml has to be parsed and stored into a Table. I am facing the issue as the XML has a different namesoace and normal XPATH query is not working
Below is the XML and need help in parsing it
declare
responsexml sys.XMLTYPE;
testparsexml sys.XMLTYPE;
begin
responsexml := sys.XMLTYPE('<GetListItemsResponse xmlns="http://schemas.microsoft.com/sharepoint/soap/">
<GetListItemsResult>
<listitems xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema">
<rs:data ItemCount="2">
<z:row ows_MetaInfo="1;#" ows__ModerationStatus="0" ows__Level="1" ows_Title="Test Title 1" ows_ID="1" ows_owshiddenversion="1" ows_UniqueId="1;#{9C45D54E-150E-4509-B59A-DB5A1B97E034}" ows_FSObjType="1;#0" ows_Created="2009-09-12 17:13:16" ows_FileRef="1;#Lists/Tasks/1_.000"/>
<z:row ows_MetaInfo="2;#" ows__ModerationStatus="0" ows__Level="1" ows_Title="Testing Tasks" ows_ID="2" ows_owshiddenversion="1" ows_UniqueId="2;#{8942E211-460B-422A-B1AD-1347F062114A}" ows_FSObjType="2;#0" ows_Created="2010-02-14 16:44:40" ows_FileRef="2;#Lists/Tasks/2_.000"/>
</rs:data>
</listitems>
</GetListItemsResult>
</GetListItemsResponse>');
testparsexml := responsexml.extract('/GetListItemsResponse/GetListItemsResult/listitems/rs:data/z:row/@ows_Title');
DBMS_OUTPUT.PUT_LINE(testparsexml.extract('/').getstringval());
end;
The issue is with rs:data , z:row nodes.... please suggest how to handle these kind of namespaces in Oracle
I need the parse the attribute "ows_Title" and save it into a DB
this script would generate "Error occured in XML Parsing"
Help is appriciated, thanks for looking

SQL> SELECT *
FROM XMLTABLE (
 xmlnamespaces ('http://schemas.microsoft.com/sharepoint/soap/' as "soap",
 '#RowsetSchema' AS "z"
 'for $i in //soap:*//z:row return $i'
 PASSING xmltype (
 '<GetListItemsResponse xmlns="http://schemas.microsoft.com/sharepoint/soap/">
<GetListItemsResult>
<listitems xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema">
<rs:data ItemCount="2">
<z:row ows_MetaInfo="1;#" ows__ModerationStatus="0" ows__Level="1" ows_Title="Test Title 1" ows_ID="1" ows_owshiddenversion="1" ows_UniqueId="1;#{9C45D54E-150E-4509-B59A-DB5A1B97E034}" ows_FSObjType="1;#0" ows_Created="2009-09-12 17:13:16" ows_FileRef="1;#Lists/Tasks/1_.000"/>
<z:row ows_MetaInfo="2;#" ows__ModerationStatus="0" ows__Level="1" ows_Title="Testing Tasks" ows_ID="2" ows_owshiddenversion="1" ows_UniqueId="2;#{8942E211-460B-422A-B1AD-1347F062114A}" ows_FSObjType="2;#0" ows_Created="2010-02-14 16:44:40" ows_FileRef="2;#Lists/Tasks/2_.000"/>
</rs:data>
</listitems>
</GetListItemsResult>
</GetListItemsResponse>')
columns ows_MetaInfo varchar2(20) path '@ows_MetaInfo',
 ows_Title varchar2(20) path '@ows_Title',
 ows__ModerationStatus varchar2(20) path '@ows__ModerationStatus'
OWS_METAINFO OWS_TITLE OWS__MODERATIONSTATUS
1;# Test Title 1 0
2;# Testing Tasks 0
2 rows selected.

Parse XML from std::wstring with XmlLite error: 0xc00cee04

Hello,
I am trying to parse the following XML (std::wstring) <message locale="en" log="true" data="'كيف حالك الآن؟">How do you do today?</message> but I get an 0xc00cee04 while reading the node type. Most probably I am not
passing the string content to the stream properly. Here s the code snippet:
CComPtr<IStream> stream;
std::shared_ptr<IXmlReader> reader;
HRESULT hr = S_OK;
COM_VERIFY(CreateStreamOnHGlobal(nullptr, false, (LPSTREAM*)&stream), L"CreateStream");
// Write message content into the stream
SIZE_T cbWrite;
COM_VERIFY(stream->Write(message.data(), message.size(), &cbWrite), L"WriteBuffer");
// Move to the beginning of the stream
LARGE_INTEGER position;
position.QuadPart = 0;
COM_VERIFY(stream->Seek(position, STREAM_SEEK_SET, nullptr), L"SeekPosition");
COM_VERIFY(CreateXmlReader(__uuidof(IXmlReader), (void**)&reader, nullptr), L"CreateXmlReader");
COM_VERIFY(reader->SetInput(stream), L"SetInputStream");
XmlNodeType nodeType;
while (!reader->IsEOF())
hr = reader->Read(&nodeType);
if (hr != S_OK) break; // <<< Here the error 0xc00cee04
What is the proper way to pass a wstring to IStream?
Thanks,
Pedro

On 4/18/2015 4:02 PM, MsdnDev wrote:
CComPtr<IStream> stream;
std::shared_ptr<IXmlReader> reader;
This makes no sense. shared_ptr will try to delete the pointer, but the COM pointer should be Release'd. You know enough to use CComPtr for IStream - how come you didn't do the same with IXmlReader?
// Write message content into the stream
SIZE_T cbWrite;
COM_VERIFY(stream->Write(message.data(), message.size(), &cbWrite), L"WriteBuffer");
What type is "message"? Is it wstring? If so, message.size() is the size in characters, but IStream::Write expects the size in bytes. You are only writing half the string.
Igor Tandetnik

Parsing xml from a socket stream

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