mathifonseca/GRAILS - ToString of a null param.md

Created July 7, 2015 12:28

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GRAILS - ToString of a null param

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GRAILS - ToString of a null param.md

I hate it. I simply hate it.

If a Grails parameter is null and you call toString() on it, it doesn't fail with a good old NullPointerException like I expected. Instead, what you get is a String with value 'null'.

The only way to get a null value when the param is null, is to use the Groovy Safe Navigation operator.

Therefore:

given:
    params.some = null
when:
    controller.index()
then:
    notThrown NullPointerException
    params.some.toString() == 'null'
    params.some?.toString() == null