?
Solved

Validating XML as it is being received over a Java TCP server socket

Posted on 2011-10-05
2
Medium Priority
?
414 Views
Last Modified: 2012-06-21
Hi all,
I should start off by saying that I am transitioning to Java from other languages (C/C++, C#) so I am not familiar with much of the existing functionality that is inherent to the Java language, or the many libraries that have been written to supplement functionality that is not built into the core code.  

I have a Java ServerSocket which will be receiving XML messages.  The fundamental question I have is - how do I know if and when I have received the whole XML message?  

If there were a way to ensure that in every case the XML message would arrive intact without timeouts or in transit errors then the task would be as simple as looking for the closing root tag, but this is, obviously not the real world.

So the different possible problems that I can see arising are:

* The client stalls and stops sending data.  This is easily handled by setting a timeout on the socket.
* The client sends an invalid XML message.
* The client sends a valid XML message, but does not conform to an XML message that the application does not know how to process (i.e. doesn't conform to a DTD or XSD)

So the though I have as to how to handle these scenarios is to write the incoming data to a stream which can validate the XML as it arrives for immediate problems, will recognize when the XML message is complete, and will validate it against a DTD or XSD.

Does such an animal already exist, or is there a ready way to develop such a thing?
0
Comment
Question by:edc
2 Comments
 
LVL 21

Accepted Solution

by:
Amitkumar P earned 2000 total points
ID: 36929850
0
 
LVL 1

Author Closing Comment

by:edc
ID: 36934042
Thank you amit_n_panchal.  There was an implementable idea in one of the links regarding sending a token after the message which will give the code a specific token to key on when it sees it in the stream.

Some things are just too obvious when you are well down into the details. :o)
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction In my previous article (http://www.experts-exchange.com/Microsoft/Development/MS-SQL-Server/SSIS/A_9150-Loading-XML-Using-SSIS.html) I showed you how the XML Source component can be used to load XML files into a SQL Server database, us…
Many times as a report developer I've been asked to display normalized data such as three rows with values Jack, Joe, and Bob as a single comma-separated string such as 'Jack, Joe, Bob', and vice versa.  Here's how to do it. 
The viewer will learn how to implement Singleton Design Pattern in Java.
This tutorial covers a practical example of lazy loading technique and early loading technique in a Singleton Design Pattern.
Suggested Courses

612 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question