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copied!<p>Yes, you can! Suppose you have the following PrimeFaces's input fields:</p> <pre><code><p:calendar id="from" value="#{mrBean.fromDate}" binding="#{from}" > <p:ajax process="from to" update="toDateMsg" /> </p:calendar> <p:calendar id="to" value="#{mrBean.toDate}" > <f:attribute name="fromDate" value="#{from.value}" /> <f:validator validatorId="validator.dateRangeValidator" /> <p:ajax process="from to" update="toDateMsg" /> </p:calendar> <p:message for="to" id="toDateMsg" /> </code></pre> <p>This should be your <code>Validator</code>:</p> <pre><code>@FacesValidator("validator.dateRangeValidator") public class DateRangeValidator implements Validator { @Override public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException { if (value == null || component.getAttributes().get("fromDate") == null) return; Date toDate = (Date) value; Date fromDate = (Date) component.getAttributes().get("fromDate"); if (toDate.after(fromDate)) { FacesMessage message = new FacesMessage("Invalid dates submitted."); message.setSeverity(FacesMessage.SEVERITY_ERROR); throw new ValidatorException(message); } } } </code></pre> <p>Note that I am using PrimeFaces's <code><p:calendar></code> component to write my example because the properties binded to this component will automatically be converted to <code>Date</code> object before being validated. In your program, you may have your own <code>Converter</code> to convert <code>String</code> to <code>Date</code>.</p>

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