How to manage with the required attribute with the h:selectOneMenu ?

dear all,
I have form with some drop down list.
All have a default value to invite user to select a criteria.
By submitting my form I have an actionListener method wich check validity of the fields.
I would like to display a message near the <h:selectOneMenu> to point the attention of the user about selection must be done.
I try following:
<h:selectOneMenu id="idContractNature" required="#{applicationController.requiredContract}" partialSubmit="true" valueChangeListener="#{applicationController.valueChangeContractType}" value="#{applicationBackingInfo.opportunityInfo.contractNatureId}">
<f:selectItems id="SlctContractNatureItms" value="#{applicationDefaultDataController.contractNatures}"/>
</h:selectOneMenu>
<h:message for="idContractNature"></h:message>I set the required attribute to true in the actionListener method if the contract id is equal to 0 (my default value)
But it doesn't work.
How can i check the validity of the drop down list?
I set the required attribute to true when the

thanks but can set null for the value of the default value due to:
Can't set property 'contractNatureId' of type 'int' on class '....' to value 'null'.
because it's a list SelectItem with int / string

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