JSP EL div operator - strange behavior

Question

I have this strange behavior in my JSP page:

I have two Integer variables count and size.

When I print the values of these variables to the page I'm getting

266 100

but when I use ${count div size} or ${count / size} I'm getting 2.66.

I checked that these both are Integers, also I put them to model, then retrieved in JSP (according to this answer) and printed class names to the JSP and they are Integers.

I know, I can write custom function, but why when that should work?

score 2 · Accepted Answer · answered Jun 15 '12 at 13:25

2

For your specific case, the EL Spec mandates that both operands should be coerced to Double before the operator is applied.

answered Jun 15 '12 at 13:25

kschneid

5,626
23
31

I do not know why is this case specific, but you are right I found [here](http://jsp.java.net/spec/jsp-2_1-fr-spec-el.pdf) in chapter 1.7.2, that **Otherwise, coerce both A and B to Double and apply operator**, really strange, in mod operator Long is used. – Betlista Jun 15 '12 at 13:31

score 1 · Answer 2 · answered Jun 15 '12 at 13:07

1

try <fmt:formatNumber value="${..} maxFractionDigits="0" />

answered Jun 15 '12 at 13:07

Bozho

588,226
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1,060
1,140

you are correct, this works, any idea why it behaves as double value? – Betlista Jun 15 '12 at 13:22
Beware: you might get a comma (`,`) or other characters as thousands separators! Use `` instead. – izogfif Feb 20 '21 at 14:03

JSP EL div operator - strange behavior

2 Answers2