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Identify best suited standard validator and implement
f:validateRequired
<h:inputText value="#{myBean.mandatoryField}"> <f:validateRequired /> </h:inputText>
f:validateRegex
<h:inputText value="#{myBean.email}"> <f:validateRegex pattern="^[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,}$." /> </h:inputText>
f:validateDoubleRange
<h:inputText value="#{myBean.double}"> <f:validateDoubleRange maximum="10.0" minimum="5.0" /> </h:inputText>
f:validateLongRange
<h:inputText value="#{myBean.long}"> <f:validateLongRange maximum="100" minimum="5" /> </h:inputText>
f:validateBean
<f:validateBean disabled="true"> <!-- nested components with bean validation are now disabled --> </f:validateBean>
f:validateLength
<h:inputText value="#{myBean.password}"> <f:validateLength maximum="20" minimum="8" /> </h:inputText>
NB If validators conflict with each other the first is applied. The example below will produce the standard validation error for the first validator, i.e. numbers between 5 and 10 are allowed, anything less than 5 or greater than 10 isn't
<h:inputText value="#{myBean.long}"> <f:validateLongRange maximum="10" minimum="5" /> <f:validateLongRange maximum="100" minimum="50" /> </h:inputText>
Updated