javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL does not work anymore since Java EE 7 / EL 3.0

Question

    javax.faces.INTERPRET_EMPTY_STRING_SUBMITTED_VALUES_AS_NULL
    true         


        

Answer 1

Fixed with a custom resolver:

faces-config.xml:

     my.package.EmptyNullStringResolver

EmptyNullStringResolver.java:

/**
 * @author pg
 */
public class EmptyNullStringResolver extends ELResolver {

    @Override
    public Class getCommonPropertyType(ELContext context, Object base) {
        return String.class;
    }

    @Override
    public Iterator getFeatureDescriptors(ELContext context, Object base) {
        return null;
    }

    @Override
    public Class getType(ELContext context, Object base, Object property) {
        return null;
    }

    @Override
    public Object getValue(ELContext context, Object base, Object property) {
        return null;
    }

    @Override
    public boolean isReadOnly(ELContext context, Object base, Object property) {
        return true;
    }

    @Override
    public void setValue(ELContext context, Object base, Object property, Object value) {
    }

    @Override
    public Object convertToType(ELContext context, Object obj, Class targetType) {
        if (String.class.equals(targetType) && obj instanceof String && ((String) obj).trim().isEmpty()) {
            context.setPropertyResolved(true);
        }
        return null;
    }
}