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From "Henri Biestro (JIRA)" <>
Subject [jira] [Commented] (JEXL-113) Dot notation behaves unexpectedly with null values
Date Thu, 07 Jul 2011 01:53:16 GMT


Henri Biestro commented on JEXL-113:

Hi Max,
Not sure which way to go:
1/ allow an option to prevent the 'dot' operator: all variables are 'antish' and array access
is needed to get to properties?
2/ allow an option to prevent the 'antish' variables; no variable can be 'antish', the 'dot'
operator always accesses a property?
3/ another solution would be to white-list classes / properties to restrict which ones can
participate in the 'dot'/'array-reference' resolution
Any opinion, preferred choice ?

> Dot notation behaves unexpectedly with null values
> --------------------------------------------------
>                 Key: JEXL-113
>                 URL:
>             Project: Commons JEXL
>          Issue Type: Bug
>    Affects Versions: 2.0.1
>         Environment: JDK 1.6
>            Reporter: Max Tardiveau
> When a variable of the form a.b is evaluated, the context is asked first for the value
of a. That value is then asked for the value of b.
> So far, so good: this is exactly what you'd expect from the dot operator.
> But if the value of b is null, the context is then asked for the value of a.b, in other
words the dot operator is ignored and "a.b" is considered to be a single variable.
> This is at best confusing. Granted, this can be avoided with the a['b'] notation, but
that's clumsy.
> I assume this is an attempt to support both the dot operator and ant-style variables.
I don't think you can have both and remain sane.
> Suggestion: either document this behavior, or make it an option. My vote would be to
just use the value returned, even if it's null. Either dot is an operator, or it's not. Perhaps
make that configurable?
> Thanks!

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