Handling servlet errors

I know its not the proper place to ask servlet questions, but I am really left thinking. I am developing a login application and I wanto to display the error messages in the login.jsp, which are thrown by the LoginServlet.
I justw ant to display my custom messages in the same login page saying : "Your username must me 8 characters long" or whatever. I dont want to go to a different error.jsp page.
Any suggestions would be greatly appreciated. I am looking for something like adding to ActionErrors and then catching them in jsp pages using <html:errors> as we do in Struts.
Sudarshan

Hi,
in a simple scenario, I created a message in the session (attribute) and reference it on the JSP page
${sessionScope.message}
Frank

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Hi,
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Are you using a JVM other than the one that shipped with iWS 6.0? If so, this is likely due to an iWS-JVM incompatibility that was fixed in 6.0 SP6. I recommend upgrading to 6.0 SP6.

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Hi All,
I get an Internal Servlet Error. What's wrong of it?
Is it any problem in servlet configuration?
If yes, how can I solve it?
Thanks very much
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Folgende Informationen wurden eingetragen:
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ueberschrift = qwe
alternativtext = qwe
text = qwe
lateinischebezeichnung = qwe
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Hello,
sorry for the late reply.
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-Udo

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Vicky Liu
TechNet Community Support

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have a look at this weblog on how to throw exceptions
in a nice way:
/people/alessandro.guarneri/blog/2006/01/26/throwing-smart-exceptions-in-xi-graphical-mapping
Also just go through <a href="/people/sap.user72/blog/2005/02/23/raising-exceptions-in-sap-xi-mapping Exceptions in SAP XI Mapping</a> and see if it helps you solve the problem.
Also go through these links:
http://help.sap.com/saphelp_nw04/helpdata/en/dc/6b7f2243d711d1893e0000e8323c4f/content.htm
http://help.sap.com/saphelp_nw04/helpdata/en/68/253239bd1fa74ee10000000a114084/content.htm
http://help.sap.com/saphelp_nw04/helpdata/en/cf/f2bbc8142c11d3b93a0000e8353423/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/5d/2166e6a91d11d188de0000e8216438/content.htm
http://help.sap.com/saphelp_nw04/helpdata/en/05/bb223905b61b0ae10000000a11402f/content.htm
Please do let know if it helped.
Regards,
Abhy

Error Handling and Error Messages

I already posted this in the java programming forum, but I dont think the people responded understand patterns, or what I was asking. Here is my original post, for reference I am not asking how to catch and exception, or how to display an error, I am asking about the pattern implementation.
I am currently in the process of creating my Exception model for my program, and I have a question about error messages. I was reading the book "Effective Java Programming" which deals with patterns and it states that an exception should state the error and report information on all relavent states. For instance If you have a class the modeled some sort of memory array, and an access was requested to a block of memory outside the array you should throw an ArrayIndexOutOfBoundsException("Index:" + index + ", start:" + 0 + ",end:" + Array.length) or if you made your own MemoryAddressOutOfBoundsException(same as above) which when printed should read
ArrayIndexOutOfBoundsException: Index:-1, start:0, end:0
stack trace
The pertinate information is the index, start index, and end index.
The book CLEARLY states as an industry design pattern that exceptions weather checked or unchecked should not contain user error messages. For instance with the above example one might be tempted to use this as the exception message: "The memory addres index is not a valid memory address." This is clearly a user error message.
So heres my situation. In a gui environment (command line console not visible) how do you generated a user error message, letting the user know that an internal exception has occured.
In my previous implementation of my project, I used the exception message the user error message and just reported the message on a dialog. I have heard of people using error catalogs, which centrallizes all the error messages into a single class or file.
I was wondering if and Error catalog was a good approach, how I might go about implementing one, and if not how do you the community handle user error messages.

class MyAppErrors {
   public static final int FILE_NOT_FOUND = 0;
   public static final int DIR_NOT_FOUND = 1;
   public stat final String[] errMsgs = {
      "The file was not found.",
      "The directory was not found.",
   public String getErrMsg( int n ) { return errMsgs[n]; }
[\code]
And a nicer version would allow the calling code to pass in a substring so you could say "The file 'somename.ext' was not found."

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