java.lang.ClassCastException: java.lang.String cannot be cast to [Ljava.lang.Object

Question

I\'m running the following query. It displays an error message. How to solve this error?

        ListrouteList=null;
        List compa         


        

Answer 1

You can just write:

vgDetails = new Route();                                 
vgDetails.setRouteName ((String)companyList.get(i));

companyList is already a list of strings because you select just one column.

Additionally, as Thilo's answer also suggests, you can cast your result directly to a List<string> instead of using List<?>.

Answer 2

Your companyList contains Strings, not Object[].

You should write

List<String> companyList = (List<String>) session.createSQLQuery (
      "select name from company where company_id=?", companyId).list();


for (String routeName: companyList) {
        vgDetails = new Route();                            
        vgDetails.setRouteName (routeName);                     
        routeList.add(vgDetails);       
    }               

Answer 3

Hibernate is return an array of String (aka a List of type String)

 List<?> companyList = session.createSQLQuery ("select name " +
                                                  "from company "+
                                                  "where company_id= " + companyId).list();   

Because your query returns a String of names from Company table.

What you have to do return a List

 List<String> companyList = (List<String>)session.createSQLQuery ("select name " +
                                                  "from company "+
                                                  "where company_id= " + companyId).list();

Change your error, from this:

 vgDetails = new Route(); 
            Object[] row = (Object[])companyList.get(i);                                 
            vgDetails.setRouteName ((String)row[0]);                     
            routeList.add(vgDetails);

To this:

vgDetails = new Route();                                
vgDetails.setRouteName (companyList.get(i));                     
routeList.add(vgDetails);

as companyList.get(i) returns a String.