Making ModelAttribute optional in Spring Controller method

Question

I have a controller method defined as follows -

@RequestMapping(method = RequestMethod.POST, value="/callMe")
public String myMethod(@ModelAttribute MyClass myObj, Model model) {
    //Do something
}

How can I make the above controller method to be called even when I do not passed the ModelAttribute myObj.

I do not want to create another controller without it and duplicate the functionality.

If you need one with and without the model and have the same functionality you might need to rethink (part) of your design. Also the model attribute is already optional, a new instance will be created (depending on how you initially created/stored the model attribute). — M. Deinum
– M. Deinum, Commented Dec 17, 2014 at 7:10

gladis · Accepted Answer · 2015-11-22 09:34:55Z

3

Model attribute is already optional. Even if you do not pass model attribute, myObj is created. So checking

if(myObj == null){
   //Do method1
}else{
  //Do method2
}

will not work.

Try this. create a Boolean in myClass like this

private Boolean isGotMyObj = false;

In your jsp which (submits model attribute) add a hidden input like this

<input type="hidden" value="1" name="isGotMyObj" />

then perform this in controller

@RequestMapping(method = RequestMethod.POST, value="/callMe")
public String myMethod(@ModelAttribute MyClass myObj, Model model) {
    if (myObj.getIsGotMyObj()){
        //Got model attribute
        //Method 1
    }else{
        //Method 2
    }

    return "callme";
}

answered Nov 22, 2015 at 9:34

gladis

1031 silver badge7 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Making ModelAttribute optional in Spring Controller method

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related