JSF 2 Input Field mandatory field validation required only when a value is entered

Question

Currently i have a field that takes in a telephone number.

It performs a length validation without fail. What i really want is there to be length validation only when a value is input, and no validation when there is no value. How can i accomplish this?

<p:inputText id="corporateTel" label="#{labelResource.telephone}">
    <f:validateLength minimum="5" maximum="20" />
</p:inputText>

score 3 · Accepted Answer · answered Mar 11 '12 at 14:39

3

This is already the default behaviour. Your problem is caused elsewhere. Perhaps you used an int instead of Integer or String, so that it defaults to 0 instead of null. Or perhaps you used an Integer while running the webapp on Tomcat/JBoss wherein the default Apache EL implementation would implicitly coerce it to 0 instead of null. You can turn it off by adding the following VM argument:

-Dorg.apache.el.COERCE_TO_ZERO=false

Or use String instead of Integer. This is also a more appropriate data type for phone numbers as they may have a leading 0 which would otherwise be chopped off when using Integer.

answered Mar 11 '12 at 14:39

BalusC

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This is insightful. Thank you once again. – Oh Chin Boon Mar 12 '12 at 01:03
is there something that had triggered you to prompt the vm argument? – Oh Chin Boon Apr 03 '12 at 14:32
I'm not sure what you're asking? – BalusC Apr 03 '12 at 14:34
Sorry what i meant was what made you think that it could also be due to Tomcat/JBoss coercing to 0 instead of null. Somehow this is happening on String too.. – Oh Chin Boon Apr 03 '12 at 14:48
I just recognized the symptoms and know the possible causes based on experience. – BalusC Apr 03 '12 at 14:48

JSF 2 Input Field mandatory field validation required only when a value is entered

1 Answers1