Hi all,
i've checked the struts-config, I have defined the FormBean, the Action contains the
right name.
If the user does not insert any data, it works correctly.
The problem appears when the user "jumps" directly to an action without previuosly
calling the action.
I get the same error on the struts sample application. If I type:
localhost:8080/struts-examples/saveRegistration.do, I get a NullPointerException.
Try it without calling the EditRegistration.do action.
Can anyone reproduce this?
Reinhard
-----Messaggio originale-----
Da: Eddie Bush [mailto:ekbush@;swbell.net]
Inviato: gio 07/11/2002 17:01
A: Struts Users Mailing List
Cc:
Oggetto: Re: NullpointerException in ActionForms
Postfach 4711 wrote:
>Hello Reinhard,
>
>what will happen if the user calls the action from the jsp without
>entering any data? If you also get the exception something is wrong
>with your validate method.
>
There is a contract between actions and the forms they use: The form
*will* be created. This can be evidenced by the source (see
RequestProcessor.java).
Your job, as an application developer, is to communicate to Struts (by
placing the name of the form-bean in the name attribute of the
action-mapping that needs access to the form) that a particular action
needs a particular form. By doing Struts can (and will!) look for that
action to be executed and instantiate the form-bean if needed. As such,
you should never get an NPE because of a form-bean. If you do, it's
*most likely* because you did not tell Struts that the action requires
access to a form-bean.
>Thursday, November 7, 2002, 3:27:43 PM, you wrote:
>
>RS> Hi all,
>
>RS> i was wondering how to handle correctly the following behaviour:
>RS> if a user calls directly from the url an action that has a Jsp in his
>RS> input and validate=true, i get a Nullpointerexception inside the
>RS> validate().
>
>RS> I think that this happens because the FormBean has never been
>RS> initialized with the values from the Jsp (the jsp has not been
>RS> displayed). All values in the FormBean are nulls.
>
>
>RS> I have added an instruction at the beginning of the validate() that
>RS> checks if one of the text fields are null, the validate returns null.
>
>RS> Is there a better way to handle this?
>
>RS> Thanks
>
>RS> Reinhard
>
--
Eddie Bush
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