Why does allow blank spaces?

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That’s normal and natural behaviour and not JSF specific. A blank space may be perfectly valid input. The required="true" only kicks in on empty inputs, not in filled inputs. In JSF you can however just create a Converter for String class to automatically trim the whitespace.

@FacesConverter(forClass=String.class)
public class StringTrimmer implements Converter {

    @Override
    public Object getAsObject(FacesContext context, UIComponent component, String value) {
        return value != null ? value.trim() : null;
    }

    @Override
    public String getAsString(FacesContext context, UIComponent component, Object value) {
        return (String) value;
    }

}

Put this class somewhere in your project. It’ll be registered automatically thanks to @FacesConverter and invoked automatically for every String entry thanks to forClass=String.class.

No need to hack the JSF API/impl. This makes no sense.

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