trying to do a cumulative addition and getting a null pointer exception

[alwin]

if (a!= null ){
b.setClaSubBalance(new Double(b.getClaSubBalance().doubleValue() + a.getClaSubBalance().doubleValue()));
}
where a and b are objects of a class.

In the very first loop the values in b will be null. How can I handle this.

[JT4NK3D]

I really don't understand that thing in brackets but why not just give b an initial value of 0 or something?

[chaster]

Hi,
What a surprise :) a and b are objects of calsses...
Have you tried:
TypeOfB = new TypeOfB(params);
That will initialize variable b, which is not null anymore.