How to use ComplexType in Web Services with Jdeveloper

I've look an article which says:
If the parameter is created as a JavaBean that implements the java.io.Serializable interface and exposes all of its properties using the accessor style of getX and setX, Oracle Application Server will handle the XML serialization and deserialization automatically.
but when I use jdeveloper to create a web Service it only comes up with the warning:
Method addCourse:the following parameter types do not have an XML Schema mapping and/or serializer specified:
mypackage.CourseJavaBean
my code is:
package whut.mypackage;
import java.io.Serializable;
public class CourseJavaBean implements Serializable

Hi Dugu,
Can you give the link to the specific article and the version of JDeveloper you are using to help you further?
One thing to keep in mind is that the accessors must be public - using package access (no modifier) is not going to work.
Hope this helps,
Eric

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