Exception Handling

[shilpi_s]

Can anyone tell me how to do exception handling in struts. ?For example if a field already exists in database...the user should get a msg as "data already exists".

[Ray Stojonic]

I do something along the following:
error occurs
create ActionErrors object
create ActionMessage with error text
add ActionMessage to ActionErrors object
add ActionErrors to request
return to page request originated from
pick up ActionErrors object with <logic:messagesPresent> tag in jsp
display error to user

[Rick Hightower]

You could also do declarative exception handling in the struts config file.

<global-exceptions>
   <exception ...../>  
</global-exceptions>

....
<action path="/userRegistration" 
            type="strutsTutorial.UserRegistrationAction" 
            name="userRegistrationForm" 
            input="/userRegistration.jsp">
        
  <exception type="java.sql.SQLException" 
            key="userRegistration.sql.exception" 
            path="/userRegistrationException.jsp" />
  <forward name="success" path="/regSuccess.jsp" />
  <forward name="failure" path="/regFailure.jsp" />
</action>

[Lasse Koskela]

"shilpi_s",
Please take a moment for reading our naming policy. As it stands, your display name fails to comply with the policy so I'll have to ask you to change it accordingly.
More specifically, the policy allows the use of initials only for the first name, not the last name. You should also use a space instead of the underscore character.
Thanks. And welcome to the JavaRanch!