returning a hashmap

[marten kay]

A real beginners question.

I am populating a HashMap (DnaiInstrument) in a database utility as below

public class DnaiDB
{
    private static HashMap <Integer, DnaiVariable> DnaiInstrument = new HashMap<Integer, DnaiVariable>();
    
    public static HashMap getInstrument()
    {
        //...
        try
        {     
            {
            //...
            }
            return DnaiInstrument;
        }
        catch(SQLException e)
        {
            e.printStackTrace();
            return null;
        }
        finally
        {
//...
        }
    }  
}    

I then when I call the getInstrument() method in the code below I get a
java.lang.NoClassDefFoundError: DNAI/data/DnaiDB DNAI.struts.TestAction.execute(TestAction.java:41)

 public class TestAction extends org.apache.struts.action.Action {
    
    //...
    private HashMap <Integer, DnaiVariable> DnaiInstrument = new HashMap<Integer, DnaiVariable>();
    /*****/
    public ActionForward execute(ActionMapping mapping, ActionForm  form,
            HttpServletRequest request, HttpServletResponse response)
            throws Exception {
        
        DnaiInstrument = DnaiDB.getInstrument();
        
        //****
        System.out.println("the size is:" + DnaiInstrument.size());
       //}
        return mapping.findForward("test2");
        
    }   

Something is wrong at the DnaiInstrument = DnaiDB.getInstrument();

where I am returning a HashMap into a HashMap variable. The program compiles, and intuitively I understand that this may be wrong, but I can't figure out how.

Hope someone can help, thanks
[ September 05, 2008: Message edited by: marten kay ]

[Ernest Friedman-Hill]

Nothing wrong with the code if it compiles; this is just a deployment problem. Either you're not putting all the class files into your jar(s), or some of your jar files aren't being put in the right place in your web server. I'm going to move this over to the Struts forum, because perhaps Struts has some special requirements for how classes have to be installed. But again, there's nothing at all wrong with the code -- it has nothing to do with "returning a hashmap."

[marten kay]

Thanks Ernest

I now think it was something in my netbeans, I rewrote the class with a different name but same code and it now works. This case closed.

thanks again and cheers

Marten