Using a class for validation

I have a form that collects some info (let's say username and email address). I wrote a Java class for it that has the set and get methods. I am wondering how I can redirect to the page from the class itself in case something fails (like an '@' not in an email address etc.). Also, if that's possible, how can I tell the original page that the validation failed so I can print a nice red error message?
Thanks!

Just submit the form through a servlet and let it handle all the business logic. Let the validator throw an exception or so and then let the servlet or bean handle it and let the JSP display a message based on that condition.
You may find this article useful to get some ideas of how to layer things properly and get it all to work together: [http://balusc.blogspot.com/2008/07/dao-tutorial-use-in-jspservlet.html].

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Problem in using View Object for validation

Hi,
I have defined a simple swing form to practice. It has one Entity Object and two View objects. One of these view objects is an updatable VO based on the EO and the other one has a simple "select count(*)" from a table. I defined a method validation on one of the EO attributes to see how can i use the VO for validation. On the other hand i defined the Application Module to use both of my views. As far as i undrestood, when i define a VO for AM, the AM will instantiate it the first time it starts running. Here is the code inside the method validation for FirstName attribute:
/**Validation method for FirstName
public boolean validateFirstName(String data) {
ViewObject vo = getDBTransaction().getRootApplicationModule().findViewObject("CountEmployeeInstance");
if (vo == null) {
System.out.println("vo is null");
else {
vo.executeQuery();
if (vo.hasNext()){
System.out.println("count = " + ((CountEmployeeRowImpl) vo.next()).getCount());
else {
System.out.println("vo has no next");
return true;
The problem is that vo.executeQuery() does not return any record. In fact the vo.hasNext() returns false and i get the message "vo has no next" on the console. Please pay attention that the VO's sql statement is SELECT COUNT(*) and it always returns a record. I found that if i use vo.closeRowSet() before vo.executeQuery() everything works fine.
Please tell me that what is my problem and why is it working like this?
Best Regards,
Alireza Vali

Chris,
1- Every thing is fine with the ADF model layer in this practice. I have tested it by using Test option on AM and it works. It works exactly the same as how it works throug swing UI that i use for it.
2- The VO is beeing found and as you see in the code, i have tested it by "if (vo == null)" just after the statement which finds it and vo is not null which means it has been instantiated by AM as it was supposed to.
3- The VO's SQL statement is "SELECT COUNT(*) FROM EMPLOYEE" with no where clause. I have 14 records in this table.
Every thing is OK with swing form. It runs and shows the records and all the binded operations like "next record", "previous record" and so on work perfectly on the records.
4- The code i used is a combination of two examples. Example 9-7 and 9-8 in pages 9-12 and 9-13 of mentioned document.
Now my findings:
I changed the code to the following:
    /**Validation method for FirstName
    public boolean validateFirstName(String data) {
        ViewObject vo = getDBTransaction().getRootApplicationModule().findViewObject("MaxEmployeeIdInstance");
        if (vo == null) {
            System.out.println("vo is null");
        else {
            //vo.closeRowSet();
            vo.executeQuery();
            System.out.println("Row Count = " + vo.getRowCount());
            System.out.println("Default Slot = " + vo.getCurrentRowSlot());
            vo.next();
            System.out.println("Slot after next() = " + vo.getCurrentRowSlot());
            vo.reset();
            System.out.println("Slot after reset() = " + vo.getCurrentRowSlot());
            vo.first();
            System.out.println("Slot after first() = " + vo.getCurrentRowSlot());
            vo.last();
            System.out.println("Slot after last() = " + vo.getCurrentRowSlot());
            System.out.println("----------------------");
            vo.executeQuery();
            System.out.println("Deafault index = " + vo.getCurrentRowIndex());
            vo.next();
            System.out.println("Index after next() = " + vo.getCurrentRowIndex());
            vo.reset();
            System.out.println("Index after reset() = " + vo.getCurrentRowIndex());
            vo.first();
            System.out.println("Index after first() = " + vo.getCurrentRowIndex());
            vo.last();
            System.out.println("Index after last() = " + vo.getCurrentRowIndex());
            System.out.println("Slot Before First = " + vo.SLOT_BEFORE_FIRST);
            System.out.println("Slot Beyound Last = " + vo.SLOT_BEYOND_LAST);
        return true;
    }Here are the results :
Row Count = 1
Default Slot = 0
Slot after next() = 3
Slot after reset() = 0
Slot after first() = 0
Slot after last() = 0
Deafault index = 0
Index after next() = -1
Index after reset() = 0
Index after first() = 0
Index after last() = 0
Slot Before First = 2
Slot Beyound Last = 3
As you see, after the execution of the statement "vo.executeQuery()" the The RowIterrator pointer is not pointing to the slot before the first record but it is pointing to the first record itself. And that is why the statement "if (vo.hasNext()" returns false because we just have one record and RowIterrator Index is standing on that record and there is no next record present. The very important thing is that even reset() method does not set the index to the slot before the first record and it sends it to the first record.
After that, i took the statemet "vo.closeRowSet()" out of the comment and here are the results:
Row Count = 1
Default Slot = 2
Slot after next() = 0
Slot after reset() = 2
Slot after first() = 0
Slot after last() = 0
Deafault index = -1
Index after next() = 0
Index after reset() = -1
Index after first() = 0
Index after last() = 0
Slot Before First = 2
Slot Beyond Last = 3
These are the exact things that we expected from the first. After query execution, the pointer is set to the slot before first record and the reset() method does its defined job which is sending the pointer to the slot before the the first record.
My Assumptions:
The Rowset which is created by AM is somehow different from the RowSet which you create in your program. I am absolutely sure that this functionality is not a bug but a design decission. I look at my simple program and see that when it runs, the data is queried and shown on the screen which is all done by AM by instantiating my VO and executing the query on it. AM reasonably must put the RowSet pointer on the first record and not the slot before first record. And i am sure that if i use reset() method on the shown RowSet, the pointer goes to the first record and the data on the screen does not get cleared. Whe we use vo.closeRowSet() and execute the query again, the AM made RowSet is closed and a new one is created and the new RowSet is your's not AM's so it functions as you expect.
Best Regards,
Alireza Vali

May I use Exception Handling for validation ?

Hello All,
Can any one know about that may i use exception handling for validation in my report program.
Please if its possible then give me some Example...
Thanks.

Hi Niraj,
Exception is not at all raised or handled in the given example.
There are so many document available in the SCN regarding OO ABAP you can read that.
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How to use multiple classes for each form

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I have created two forms using screen painter and now i want to use different classes for these two forms .
I have declared the Sbo Connection in main class i.e. Set Application ,Connection Context() but while connecting to other classes
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Hi Amit,
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hi,
For that shall i have to create individual patterns for matching the inputs from different locales or a single pattern will do in the case of validating phone nos. around the world, zip codes etc. In case different patterns are required, programmer should have a konwledge of difference in patters for different locales.
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I now would like to use this class for multiple MCs in my library. I thought I could let Flash create a class for each of them and specifying the CaseStudyQuiz class as the Base class. When I do that, I get the following error:
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It's not easy to tell which forum is most appropriate. Perhaps the "Enhancements and Modifications" forum could be said to be appropriate, as the validations and substitutions can be said to be a sort of enhancement technique. I am sure someone there will disagree, but that's the only candidate I see besides "ABAP, General".

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inputVariable="InvokeFileMove_MoveFile_InputVariable"
partnerLink="MoveFileService" portType="ns1:MoveFile_ptt"
operation="Move" bpelx:invokeAsDetail="no">
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I have successfully used this API and it works fine.
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variable="inputDirectory"/>
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Pass approppriate values into the above given variables and try.
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<Puneet/>

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Thanks in advance
Martin

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http://forum.java.sun.com/thread.jspa?forumID=57&threadID=680674
quite yet, but it's implemented in quite a bit different way. Like I was saying the buttonClass that you created seem to be creating an object of which function I don't quite see. It looks more like a method, but I'm still trying to see how you did it, since it obviously worked.
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Message was edited by:
deadseasquirrels

Can i use a class for this or do i need to use a type def

what i am trying to do is have a parent cluster witch has a file name and some free space to put is children's data in with decorations at the bottom.
i then need to have a child with a graph in the middle blank space of the parent.
i also need to have another child with a table in the middle blank space.
can i do this with classes or do i need to use typdefs.
tks in advance

Hello vivi,
I'm not entirely sure what you mean. The classes that you create in LabVIEW 8.2 are meant to be containers for data and methods, not displayable items. Even though a class's private data members are defined in a cluster, you can't think of a class and a cluster as the same thing. A cluster is an object that you can use to bundle different kinds of information together. You can also design a cluster to be displayed on a front panel.
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Regards,
Justin D
Applications Engineer
National Instruments

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Hello everyone,
Before I get started into the problem, I'll tell you what it is I'd like to do. I'm building an educational applet that'll allow students learning Java programming to write code on a Web page. My goal is to simulate a compiler environment without having it actually compile code (i.e. I want to tell them if there are any syntactic errors in their code). I've searched around the Web quite a bit for how to do this, and I thought I had something by using the JavaCompiler class. It works perfectly in a command-line version I've developed, but in the applet, when I invoke the compiler, the applet freezes. I've isolated it to the compiler call itself. Here is the init method (yes, I know it's a better idea to do the hard work and GUI building in a separate class; but right now, I'm just checking if it all works).
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My questions are these: is there an easier way to go about this? Is there a way to invoke the compiler to get its output only, WITHOUT directly compiling a class? Is there a Magic Library designed for this that I've somehow overlooked? I know JDB only works on already-compiled class files; there's a tool called Checkstyle that seems to be more for formatting and subtle issues of style (hence, the name) than actual error checking (not to mention, it requires compiled code as well).
Any thoughts would be greatly appreciated, all. :) Let me know if you need more info.

>
I checked the console after the freeze; it's handing me a NullPointerException for that line, which would be understandable except all of the arguments to call() can deal with null values. ( http://download.oracle.com/javase/6/docs/api/javax/tools/JavaCompiler.html )
From the javadoc for ToolProvider.getSystemJavaCompiler():
Returns:
the compiler provided with this platform or null if no compiler is providedSo it's definitely possible that compiler.getTask(null, null, null, getOptions(), null, fileObjects) returns null.
Indeed that's what I would expect from a browser's JVM (which includes only a JRE, and not a JDK).
Edited by: jduprez on Apr 29, 2011 2:56 PM
Ah, ah, I missed your latest edit while I was reading the API Javadoc :o)
Glad you found out!

Using a class for validation

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