[castor-dev] New user needs help with Collections

Mon, 09 Feb 2004 06:46:21 -0800

Hi! As a new user, I am struggling a bit here. I hope this is a trivial problem and I get many responses J

 

I need to do marshalling/unmarshalling for a simple object that contains a collection. Some help with defining the mapping file will be much appreciated. I am getting an exception: “Exception in thread "main" org.exolab.castor.mapping.MappingException: The method getRoles in class ArrayList accepting/returning object of type null was not found”

 

The Java Class:

import java.util.*;

public class UserProfile

{

            private String userId;

            private String userName;

            private ArrayList roles;

 

            public UserProfile() {

            }

 

            public ArrayList getRoles()

            {

                        return roles;

            }

 

            public void setRoles(String role)

            {

                        this.roles = roles;

            }

// getters and setters for other fields

}

 

The mapping file I have defined is:

<!DOCTYPE databases PUBLIC "-//EXOLAB/Castor Mapping DTD Version 1.0//EN"  "http://castor.exolab.org/mapping.dtd">

<mapping>

  <description>Basic mapping example</description>

  <class name="UserProfile" auto-complete="true">

    <map-to xml="user_data"/>

    <field name="userId">

            <bind-xml name="user_id" node="element"/>

    </field>

    <field name="userName">

            <bind-xml name="user_name" node="element"/>

    </field>

    <field name="roles" collection="collection" type="ArrayList">

            <bind-xml name="user_roles"/>

    </field>       

  </class>

  <class name="ArrayList" auto-complete="true">

    <field name="roles">

            <bind-xml name="role" node="element"/>

    </field>

  </class>

</mapping>

 

I’d like to see an output XML in the following format:

<?xml version="1.0" encoding="UTF-8" ?>

<user_data>

          <user_id>N1001</user_id>

          <user_name>Nirmit</user_name>

          <user_roles>

                   <role>friend</role>

                   <role>philosopher</role>

                   <role>guide</role>

          </user_roles>

</user_data>

 

Any recommendations?

 

Thanks,
Nirmit


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