Swift 2 jSON Call can throw but it is not marked with try

yesterday i updated to El Capitan beta 2 and Xcode 7 - beta is mandatory. So i updated my app to Swift 2 and new error comes to the json string. This is my code :

let jsonData:NSDictionary = NSJSONSerialization.JSONObjectWithData(urlData!,options:NSJSONReadingOptions.MutableContainers ) as! NSDictionary

第一种用法：

do {
   let jsonData = try NSJSONSerialization.JSONObjectWithData(urlData!,options:NSJSONReadingOptions.MutableContainers ) as! NSDictionary
   // use jsonData
} catch {
    // report error
}

letjsonData = try NSJSONSerialization.JSONObjectWithData(urlData!,options:NSJSONReadingOptions.MutableContainers ) as! NSDictionary