java.util.Vector cannot be cast to java.util.Hashtable

[Mostapha ZINE EL ABIDINE]

hi, since I did the last update of codenameone, I get this error java.lang.ClassCastException: java.util.Vector java.util.Hashtable cannot be cast
My code: 

  JSONParser parser = new JSONParser (); 

                         Hashtable h = parser.parse (new InputStreamReader (input)); 

                         Vector contents = (Vector) h.get ("result"); 

                        

                         model.removeAll (); 

                         for (int i = 0; i <contents.size (); i + +) {

                             Hashtable elmts = (Hashtable) contents.elementAt (i); 

                             / / System.out.println ((String) elmts.get ("signature")); 

                             model.addItem ((String) elmts.get ("signature")); 

                         }
Help me pleaze !

[Shai Almog]

Hi,
I'm guessing the structure of your JSON changed and the contents is now a vector.

[Mostapha ZINE EL ABIDINE]

this is my json file

[babtu]

Shai is right. In file you have vector of hashtables.Try this:

JSONParser parser = new JSONParser (); 

Vector v = (Vector)parser.parse (new InputStreamReader (input));
for(int i = 0; i < v.size(); ++i)
{
    Hashtable h = v.get(i);
   //do whatever you want
}

[Mostapha ZINE EL ABIDINE]

batu i tried your code and i got this error,
I'm sorry but i upload the json file , this is th good one here

java.util.Vector cannot be cast to java.util.Hashtable

at com.mycompany.myapp.MyApplication$1.readResponse(MyApplication.java:71)

at com.codename1.io.ConnectionRequest.performOperation(ConnectionRequest.java:398)

at com.codename1.io.NetworkManager$NetworkThread.run(NetworkManager.java:261)

at com.codename1.impl.CodenameOneThread.run(CodenameOneThread.java:176)

Le mercredi 26 février 2014 20:27:21 UTC, Mostapha ZINE EL ABIDINE a écrit :

[Shai Almog]

In line 71 of your app you are casting a vector to a Hashtable.
Place a breakpoint on that line.
Run the debugger and inspect the variable, expand it and look at the types of elements within to understand how they break down.

[babtu]

Its not a suprise for me since you are executing it on JSON file with different structure. Now you have Hashtable with one key - "result", which value is vector of vectors of hashtables. You need to become more familiar with JSON format and JSON parsing methods in CN1, because I have the impression that you have no idea what you are doing. Helpful links: 4 Ways to Consume JSON Web Services in Codename One, expression language for json and xml, JSON

[Mostapha ZINE EL ABIDINE]

thanks for your answer, now i changed my code, and i got juste the first element, how can i got all element ?
my new code: 

                    try {

                    JSONParser parser = new JSONParser();

                    Result result = Result.fromContent(parser.parse(new InputStreamReader(input)));

                    Hashtable res = (Hashtable)result.get("result");

                    Hashtable post = (Hashtable)res.get("posts");

                    System.out.println("" + post.get("signature"));

                     

                    } catch (IOException ex) {

                        System.out.println(ex.getMessage());

                    }

Le mercredi 26 février 2014 20:27:21 UTC, Mostapha ZINE EL ABIDINE a écrit :

[Shai Almog]

That's a very different type of parsing. See http://gadgets.coolman.ca/new-feature-introduction-expression-language-for-json-and-xml/ for explanation on that approach.