[rules-users] jsp, java and drl file

[Michael Anstis]

You need your rule to return something to Java showing the validation
result.

In your RHS you need to either:-

(a) set a global variable with the result and retrieve the value of the
global from Java after fireAllRules().

(b) insert an arbitrary fact type and have a query return this.

Both approaches should do as you need - but be warned, creating a
KnowledgeBase for each login attempt should be discouraged as it is an
expensive operation.

Most people might have a single KnowledgeBase pre-loaded into an
Application scope parameter and just create new stateless sessions in an
HTTP request.

With kind regards,

Mike

On 14 June 2012 15:39, Brajesh <brajesh4etc at gmail.com> wrote:

> Hi
>
> I am trying to say that as in my drl file if username is null or blank I
> want to show a message in my jsp page that username can't be null.
>
> Regards
> Brajesh
>
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