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Resolution to the ORA-02262 error
Thursday, May 10, 2007
If you have ever faced this error message

ORA-02262: ORA-%05d occurs while type-checking column default value expression

while trying to alter the column definition of a table to NVARCHAR2 with Default Value just remember :

A 'string' literal is of type VARCHAR2
A N'string' literal is of type NVARCHAR2 !!

So now, you can correct your syntax and alter your table properly like this :

ALTER TABLE mytbl MODIFY mycolumn NVARCHAR2(3) DEFAULT N'A';

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posted by Admin @ 11:39 PM   3 comments
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Oracle Application Server 10.1.3 Bug when submitting Greek characters the result returns question marks
I remember back in the good old days of Oracle Application Server 10g R2 when i faced the same problem while developing in struts with jDeveloper 10g R2. It was indeed very difficult to finaly realize that a simple addition to orion-web.xml of the default-charset="windows-1253" would solve the problem so easily.

Now with the latest version of Oracle Application Server 10g R3 (10.1.3) i came across the same issue and i thought that i could easily solve the problem by simply doing the same thing.

I was wrong :-)

People, unfortunately i must warn you that this workaround doesn't apply to the R3 family. What you have to do now is to include


request.setCharacterEncoding("Windows-1253");


in all your JSP pages.

For those of you still developing in struts, i will show you a smarter way to automatically include this in all your pages without modifying any of these pages at all.

Have you ever "played" with the RequestProcessor ? The RequestProcessor has the ability to execute code before it goes to the Action Servlet. What you need to do here is extend the RequestProcessor so that it includes


request.setCharacterEncoding("Windows-1253");


in every call.

In jDeveloper 10g R3, create a new java class and write the following code :


package testgreek.view; //don't forget to change the name of the package to the
//one that you are using

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.RequestProcessor;

public class CustomRequestProcessor extends RequestProcessor {
protected boolean processPreprocess (HttpServletRequest request, HttpServletResponse response) {


try{
request.setCharacterEncoding("Windows-1253");
}
catch(Exception ex){
//.....
}

return true;
}

protected void processContent(HttpServletRequest request,
HttpServletResponse response) {
try{
request.setCharacterEncoding("Windows-1253");
}
catch(Exception ex){
//........
}
super.processContent(request, response);
}
}


Then, go to your struts-config.xml and add the following property to your controller :


<controller>
<set-property property="processorClass" value="testgreek.view.CustomRequestProcessor">
</controller>


That's it. Now every time you submit a page to the servlet, it includes the character encoding that you have selected.
That means no more ????

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posted by Admin @ 10:19 PM  
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About Me

Name: John Galanopoulos
Home: The NeverLands
About Me: A source code wonderer since the early 80s with my first ZX81 by Sinclair, home computer.
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