Hi All,

I develop web application using struts2. I want to improve getting string from forms. For this need trim all string and if obtained string is empty then set null to field.

For this, I created StringConverter.

public class StringConverter extends StrutsTypeConverter {

    @Override
    public Object convertFromString(Map context, String[] strings, Class toClass) {
       if (strings == null || strings.length == 0) {
          return null;
       }

       String result = strings[0];
       if (result == null) {
          return null;
       }

       result = result.trim();
       if (result.isEmpty()) {
          return null;
       }
       return result;
    }

    @Override
    public String convertToString(Map context, Object object) {
       if (object != null && object instanceof String) {
          return object.toString();
       }
       return null;
    }
}

Next, I added row to xwork-conversion.properties

java.lang.String=com.mypackage.StringConverter

Thats all. But I did not get the desired result.

convertToString() method is called when jsp build form, but convertFromString() doesn't invoke.

What I do wrong? How can I get the same behaviour using another way?

Please, not offer solutions such as:

1. remove the value of such form elements using javascript.
2. create util method which will make it using reflection. Then call it for each form bean.

Thanks in advance, Alexey.