5 Replies Latest reply on Oct 19, 2006 6:57 AM by jaikiran

    Help on java.lang.ClassCastException: java.lang.String

    scout1lacno
    scout1lacno Oct 19, 2006 1:37 AM

      Hi,

      Hi all im having an error java.lang.ClassCastException: java.lang.String

      Does anyone have an idea on this error?

      My codes are:

       TblCountryFacadeLocal myCountryBean = lookupTblCountryFacade();
 List myList = myCountryBean.findAll();
 int length = myList.size();

 for (int i = 0; i < length; i++) {
 TblCSCSubCategory region = (TblCSCSubCategory) myList.get(i) ;
 System.out.println((i + 1)+". "+region.getStrName().toString());
 }


      And for my Entity code is: 
      public List findAll() {
 return em.createQuery("select o.strCountry from TblCountry as o").getResultList();
 }


      Hope for a kind response.

      Thankz :)

      • 2585 Views
      • Tags:
        • 1. Re: Help on java.lang.ClassCastException: java.lang.String
          jaikiran
          jaikiran Oct 19, 2006 3:03 AM (in response to scout1lacno)

           

          select o.strCountry from TblCountry as o


          o.strCountry appears to be a column of type String. So the returned objects will be of type java.lang.String. Your code:

          TblCSCSubCategory region = (TblCSCSubCategory) myList.get(i) ;


          will have to be changed to: 

          String country = (String) myList.get(i);


            • Actions
          • 2. Re: Help on java.lang.ClassCastException: java.lang.String
            scout1lacno
            scout1lacno Oct 19, 2006 6:14 AM (in response to scout1lacno)


            Hi Jaikiran,

            Have tried your advice on:

            String country = (String) myList.get(i);


            I have changed my code to: 

            for (int i = 0; i < length; i++) {
 //TblCountry region = (TblCountry) myList.get(i) ;
 String country = (String) myList.get(i);
 System.out.println(country);
 }


            But it return an error. The error is: 

            java.lang.ClassCastException: [Ljava.lang.Object;
crm.ui.servlets.CountryBean.processRequest(CountryBean.java:46)
crm.ui.servlets.CountryBean.doGet(CountryBean.java:70)


            Thankz in advance :)

            Keith



              • Actions
            • 3. Re: Help on java.lang.ClassCastException: java.lang.String
              jaikiran
              jaikiran Oct 19, 2006 6:25 AM (in response to scout1lacno)

               

              java.lang.ClassCastException: [Ljava.lang.Object;
              crm.ui.servlets.CountryBean.processRequest(CountryBean.java:46)


              Check line numbered 46 in the CountryBean. Looks like its casting an Object[] to something else.



                • Actions
              • 4. Re: Help on java.lang.ClassCastException: java.lang.String
                scout1lacno
                scout1lacno Oct 19, 2006 6:29 AM (in response to scout1lacno)



                Line 46 is this:

                String country = (String) myList.get(i);

                My full code is:

                protected void processRequest(HttpServletRequest request, HttpServletResponse response)
 throws ServletException, IOException {
 response.setContentType("text/html;charset=UTF-8");
 PrintWriter out = response.getWriter();

 TblCountryFacadeLocal myCountryBean = lookupTblCountryFacade();
 List myList = myCountryBean.findAllCat();
 int length = myList.size();

 out.println("<html>");
 out.println("<head>");
 out.println("<title>Servlet CountryBean</title>");
 out.println("</head>");
 out.println("<body>");

 for (int i = 0; i < length; i++) {
 //TblCountry region = (TblCountry) myList.get(i) ;
 String country = (String) myList.get(i);
 System.out.println(country);
 }
 /*for (Iterator iter = myList.iterator(); iter.hasNext();) {
 //String cityName = ( String )new String( iter.next().toString() );
 String cityName = ( String ) new String( iter.next().toString() );
 out.println("<p>"+ cityName +"</p>");

 }*/


 out.println("</body>");
 out.println("</html>");

 out.close();
 }


                Any suggestions? :)

                Thankz :)

                  • Actions
                • 5. Re: Help on java.lang.ClassCastException: java.lang.String
                  jaikiran
                  jaikiran Oct 19, 2006 6:57 AM (in response to scout1lacno)

                  Are you sure you changed the code at the right place. Your first post had the following code, which i asked you to change:


                  TblCountryFacadeLocal myCountryBean = lookupTblCountryFacade();
 List myList = myCountryBean.findAll();
 int length = myList.size();

 for (int i = 0; i < length; i++) {
 TblCSCSubCategory region = (TblCSCSubCategory) myList.get(i) ;
 System.out.println((i + 1)+". "+region.getStrName().toString());
 }


                  The code that you changed has something different: 

                   TblCountryFacadeLocal myCountryBean = lookupTblCountryFacade();
 List myList = myCountryBean.findAllCat();
 int length = myList.size();

 for (int i = 0; i < length; i++) {
 //TblCountry region = (TblCountry) myList.get(i) ;
 String country = (String) myList.get(i);
 System.out.println(country);
 }




                    • Actions