Re: [rules-users] NullPointerException with Wrapper objects
I am no expert on drools; however, you might want to retract loanDeduction
from the Working Memory if it is null. Your first rule determines that it
is null and then you set the value (ld = 0f); however, you should be using
an insert to put this into working memory. The other alternative is to
retract the loan Deduction from working memory and add a logic check in the
Nett Salary rule to see if loan Dedcution is null.
I am working on some Drools stuff today if you need some more help on this.
Shannon
On Wed, May 13, 2009 at 1:14 AM, dhai <sdhari(a)hotmail.com> wrote:
I am facing problems which many have encountered in the past. I searched
forums but could not get precise answer. The problem is with null values in
Wrapper objects. See the following code:
rule "Null Check " salience 100
when
Salary ( ld : loanDeduction==null || < 0f ) // loanDeduction
is java.lang.Float
then
log("Load return is null"); //Global function
ld = 0f;
end
rule "Nett Salary" salience 70
when
Salary ( nett != ( gross – loanDeduction – pf) )
then
log("Invalid nett salary amount");
end
You may have idea what I am trying to do. But I get NullPointerException in
“Nett Salary” rule when I fire the rules having fact with null in the
loanDeduction attribute. I believe my “Null Check” exception should execute
first and it does when I put negative value in loadDeduction. What is
solution in such a case?
--
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http://www.nabble.com/NullPointerException-with-Wrapper-objects-tp2351550...
Sent from the drools - user mailing list archive at Nabble.com.
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