Lookup Singelton to client problem

[Mark Spritzler]

I have a class

 
public abstract class AbstractLookup<K, V> implements Serializable  {
 
    protected Lookup<K, V> data = new Lookup<K, V>();
    protected static AbstractLookup abstractLookup;
 
    public Lookup<K, V> getData() {
        return data;
    }
 
    public void reset() {
        loadData();
    }
 
    protected abstract void loadData();
}
 

And the Lookup Class is

 
public class Lookup<K, V> implements ILookup<K, V>{
    protected HashMap<K, V> data = new HashMap<K, V>();
 
    public Map<K, V> getData() {
        return data;
    }
 
    public void setData(HashMap<K, V> data) {
        this.data = data;
    }
 
    public synchronized V save(K key, V value) {
        return data.put(key, value);
    }
 
    public synchronized V delete(K key) {
        return data.remove(key);
    }
}
 

Here is one class that Implements the AbstractFactory

public class DiscountTypeLookup extends AbstractLookup<String, RetailDiscount> {
 
    protected static AbstractLookup<String, RetailDiscount> abstractLookup;
 
    static { abstractLookup = new DiscountTypeLookup(); }
 
    private DiscountTypeLookup() {
        loadData();
    }
 
    public static AbstractLookup getInstance() {
        return abstractLookup;
    }
 
    protected void loadData() {
        Session sessionObj = HibernateUtil.currentSession();
        Criteria searchCriteria  = sessionObj.createCriteria(RetailDiscount.class);
        List resultList = searchCriteria.list();
        ILookup<String, RetailDiscount> lookup = abstractLookup.getData();
        if(resultList!=null){
            int noRecords=resultList.size();
            for(int k=0; k<noRecords; k++){
                RetailDiscount discount = (RetailDiscount)resultList.get(k);
                lookup.getData().put(discount.getDiscountCode(), discount);
            }
        }
    }
}

So in the server side I create one of these and put it into a Map that I return to the client. The Map key is the DiscountTypeLookup.class and the value is the lookup object within the AbstractLoopkup.

When I get it on the client it is seeing that the DiscountTypeLookup class has the loadData method with code, which include Hibernate classes.

Even though I can never call the loadData method on the client, since we use the Class jsut to get the value out, in which the value class is of Type Lookup, which implements the ILookup interface. So the client gets the value out and assigns it to a reference of type ILookup, and that is all it can call methods on, is methods defined in that interface.

OK here is my problem, it is giving me a ClassDefNotFound exception on the Hibernate classes on the client. These classes are not on the client and should not be.

How can I get around this problem.

I hope I was clear enough in my explanation.

Thanks

Mark

[Mark Spritzler]

OK, here is the solution.

Instead of using the DiscountTypeLookup.class as the key I am using the RetailDiscount.class.getName() instead. So I use the String value of the DTOs class name.

Mark