Accept only digits for h:inputText value

Just bind the input value to a Double, or better, BigDecimal property instead of String.

private BigDecimal number; // Double can also, but beware floating-point-gui.de

<h:inputText value="#{bean.number}" />

JSF has builtin converters for those types which will kick in automatically. You can customize the converter message as below:

<h:inputText value="#{bean.number}" converterMessage="Please enter digits only." />

<h:inputText onkeypress="if(event.which &lt; 48 || event.which &gt; 57) return false;"/> is a short way if you want to accept integers only.

It has the advantage over type="number" that you can't even enter a non-digit

If you add this to your xhtml

xmlns:pe="http://primefaces.org/ui/extensions"

and use the inputext for numbers of Primefaces Extensions called pe:inputNumber , which not only validate your numbers but decimals also, may be more complete.

<pe:inputNumber value="#{beanTest.myValue}" thousandSeparator="" decimalSeparator="." decimalPlaces="0" />