Can't pass arraylist?

Question

I am running my webservice that returns a set of values from a database. It will return a value as a string no problem, so I know it is connecting. It is now giving me a "nullpointerexception" error when I try to print out the first value(or any) in my arraylist. I am assuming it won't pass this type. I tried passing type CachedRowSet and it wouldn't even run, it gave a WSDL parsing error.
Does anyone know how to pass an ArrayList or a CachedRowSet to a client? Or how to populate a ResultSet with more than one value when you have more than one SQL statement bringing info into it? (It was writing over the old value with the new value everytime it went through the loop.)
Here is my server side code to generate the arraylist...
            ResultSet rs = stmt.executeQuery(query);
            int i = 0;
            Object arrayValue;
            while (rs.next()){
                arrayValue = rs.getString("end_phrase");
                returnArray.add(arrayValue);
            conn.close();
            return returnArray;Here is the client side bringing it in...
resultArray = myProxy.sayHello(rapArray);
            String objectName = (String) resultArray.get(0);
            System.out.println(objectName);         

Answer 1

Arbitrary classes (user defined or as mentioned 'CatchedRowSet' are allowed if they full fill this criteria :
To be supported by JAX-RPC, an application class must conform to the follow-ing rules:
� It must have a public default constructor.
� It must not implement (either directly or indirectly) the java.rmi.Remote interface.
� Its fields must be supported JAX-RPC types.
The class may contain public, private, or protected fields. For its value to be passed (or returned) during a remote call, a field must meet these requirements:
� A public field cannot be final or transient.
� A non-public field must have corresponding getter and setter methods.
Surely ArrayList is supported.
Check if ArrayList obtained is not null(there are records) and has size >1
--Ashwani