complex constructor form data binding

[cromorrissey]

Hi.

I am wondering is there way to bind objects with complex constructor.

If i have som object e.g

public class MyObject1
{
       private Long _id;
       private String _name;

       public void setName(String name)
       {
            _name = name;
        }
        public String getName(String name)
       {
            return _name;
        }

         // .... here goes remaining setters and getters methods.
}

So if i send form data and then use in my controller annotation @ModelAttribute

public ModelAndView myController(@ModelAttribute("myObject1") MyObject1 myObject1
{
 // ... here goes remaining controller code
}

This situation works.

But if my object is like this

public class MyObject2
{
       private final String _property;

       public MyObject2(String property)
       {
             _property = property;
       }

       private Long _id;
       private String _name;

       public void setName(String name)
       {
            _name = name;
        }
        public String getName(String name)
       {
            return _name;
        }

         // .... here goes remaining setters and getters methods.
}

Now i don't have simple construcor. So i can't create object like this :

 MyObject2 xxx= new MyObject2();

i have to use :

MyObject2 yyy= new MyObject2("some property");

So when i'm binding form data to this new object i'm getting these exception:

org.springframework.beans.InvalidPropertyException: Invalid property ....
           Could not instantiate property type [com.myPackage.MyObject2] to auto-grow nested property path: java.lang.InstantiationException

is there way to resolve this?

thanks.

[Marten Deinum]

Create a method which constructs your object and annotate it with @ModelAttribute or create a method which reacts to a GET request, constructs the object, put it in the model and make it a @SessionAttribute. Spring cannot use the auto instantiation feature so you will have to do the work yourself.