Question

all data is required to be trimmed before going database. i currently use hibernate with JSF.
where would you put this logic in? in hibernate entity bean,or JSF backing beans?
what’s pros and cons. is there any other suggestion?

Answer 1

Do it in the view side. You can just create a JSF Converter for String.class.

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

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

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

}

Or when you’re still on JSF 1.2, get rid of @FacesConverter and register it as follows in your faces-config.xml.

<converter>
    <converter-for-class>java.lang.String</converter-for-class>
    <converter-class>com.example.converters.StringTrimmer</converter-class>
</converter>

Either way, it’ll be applied on all input properties of the String type without the need to change anything else.

This is not possible on JSF 1.1 or older due to the internal design.