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Problem in return Collection in Websphere Webservice  RSS feed

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I wrote a simple web service which returns Complex user defined objects like CustomerBean/UserBean within a Hash Map.

Here is the webservice:

public class MyWebservice{

public HashMap getData(HashMap requestData) {
//goes and gets the data from business service component and
//gets business objects and it is stored into response HashMap.
HashMap responseData = new HashMap();
responseData.put("customer",new CustomerBean());
return response;

public class CustomerBean implements {
// has attributes and its getter and setter method...

Web service is deployed in IBM Websphere Application Server 6 environment.

When client calls this web service, I am getting an exception at the server:
"Serialization cannot occur for CustomerBean"

Could you please explain what i am doing wrong. How to fix this issue...

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