How to pass a Javascript array to the Spring Controller Class

Question

I created the JS array and try to pass the array to the Controller class, but there it is showing the NullPointerException.

I checked the URL through FireBug there the values are passing but in controller class if I try to retrive it is showing NULL.

JavaScript Code:

var deleteWidgetId = new Array(); //array created 
deleteWidgetId[0] = "a";//adding values 
deleteWidgetId[1] = "b"; 
//action trigged 
$("#saveLayout").load("layout/saveLayout.action", 
 { deleteWidgetId : deleteWidgetId },      
 function(response, status, xhr) { });

Java Code (In controller class):

@RequestMapping(value = "/saveLayout")
public ModelAndView saveLayout(@RequestParam String[] deleteWidgetId) throws Exception { 
    //here that if i try to use the deleteWidgetId it is giving null pointer exception
}

JavaScript Code: var deleteWidgetId = new Array(); //array created deleteWidgetId[0] = "a";//adding values deleteWidgetId[0] = "b"; //action trigged $("#saveLayout").load("layout/saveLayout.action", { deleteWidgetId : deleteWidgetId }, function(response, status, xhr) { }); — mohammed abuthaheer
– mohammed abuthaheer, Commented Aug 12, 2013 at 12:34
Java Code:(In controller class) @RequestMapping(value = "/saveLayout") public ModelAndView saveLayout(@RequestParam String[] deleteWidgetId) throws Exception { //here that if i try to use the deleteWidgetId it is giving null pointer exception } — mohammed abuthaheer
– mohammed abuthaheer, Commented Aug 12, 2013 at 12:35

yname · Accepted Answer · 2013-08-12 12:36:25Z

1

Try to use List<String> instead of String[]

answered Aug 12, 2013 at 12:36

yname

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2 Comments

mohammed abuthaheer Over a year ago

I try this using the List<string> but still it is showing the Null for that deleteWidgetId

yname Over a year ago

Try to rename deleteWidgetId js variable to deleteWidgetIdValues

Amin Abu-Taleb · Accepted Answer · 2013-08-13 06:47:58Z

1

You have to specify the name of the request parameter within the annotation:

@RequestMapping(value = "/saveLayout")
public ModelAndView saveLayout(@RequestParam(value="deleteWidgetId") String[] deleteWidgetId) throws Exception { 
    //here that if i try to use the deleteWidgetId it is giving null pointer exception
}

answered Aug 13, 2013 at 6:47

Amin Abu-Taleb

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