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From "Judes Tumuhairwe" <judethecuted...@gmail.com>
Subject AegisDataBinding throwing NullPointer
Date Sun, 06 Apr 2008 06:40:09 GMT
Hi,
I have an interesting case binding/marshalling complex types using the 2.1
snapshot. A NullPointer is thrown [in NamespaceHelper.getPrefix() ] when I
used AegisDataBinding but it works perfectly fine when I use JAXB (see the
"comment me to use JAXB" line in the server & client).

Question: Do I absolutely have to have a prefix for my namespace? How come
it works fine with primitives? [actually I was trying to get the service
working with some interfaces & abstract classes & was running into "no write
method for property xxx" so when I took them out & dealt with POJOs, I ran
into this NPE.]

About the environment: Eclipse Europa, Win XP, Java 1.6
I have 2 beans, the interface and the implementation, the server & the
client (all in the same package).
First, here is the stacktrace:

Apr 6, 2008 2:06:05 AM
org.apache.cxf.service.factory.ReflectionServiceFactoryBean
buildServiceFromClass
INFO: Creating Service {http://education.toorosystems.com/}University from
class com.toorosystems.education.University
Exception in thread "main" java.lang.NullPointerException
    at
org.apache.cxf.aegis.util.NamespaceHelper.getPrefix(NamespaceHelper.java:71)
    at
org.apache.cxf.aegis.util.NamespaceHelper.getUniquePrefix(NamespaceHelper.java:57)
    at
org.apache.cxf.aegis.type.basic.BeanType.getNameWithPrefix(BeanType.java:533)
    at
org.apache.cxf.aegis.type.basic.BeanType.writeSchema(BeanType.java:483)
    at
org.apache.cxf.aegis.databinding.AegisDatabinding.createSchemas(AegisDatabinding.java:477)
    at
org.apache.cxf.aegis.databinding.AegisDatabinding.initialize(AegisDatabinding.java:322)
    at
org.apache.cxf.service.factory.ReflectionServiceFactoryBean.buildServiceFromClass(ReflectionServiceFactoryBean.java:343)
    at
org.apache.cxf.service.factory.ReflectionServiceFactoryBean.initializeServiceModel(ReflectionServiceFactoryBean.java:392)
    at
org.apache.cxf.service.factory.ReflectionServiceFactoryBean.create(ReflectionServiceFactoryBean.java:180)
    at
org.apache.cxf.frontend.AbstractWSDLBasedEndpointFactory.createEndpoint(AbstractWSDLBasedEndpointFactory.java:79)
    at
org.apache.cxf.frontend.ServerFactoryBean.create(ServerFactoryBean.java:113)
    at com.toorosystems.education.Server.main(Server.java:19)

The model:
*a)* The beans:
1. Course [id (long), name & description; their getters and setters, + 2
constructors: (no-arg & all-arg)]
2. Teacher [age (int), name, department; their getters/setters, + 2
constructors (no-arg & all-arg i.e. Course(int age, String name, String
dept)]

*b)* The interface:
package com.toorosystems.education;

import javax.jws.WebService;
import javax.jws.soap.SOAPBinding;
import javax.jws.WebMethod;
import javax.jws.WebResult;
import javax.jws.WebParam;

@WebService(name="University", targetNamespace="
http://education.toorosystems.com/")
@SOAPBinding(use=SOAPBinding.Use.LITERAL, style=SOAPBinding.Style.DOCUMENT,
parameterStyle=SOAPBinding.ParameterStyle.BARE)
public interface University {

    @WebResult(targetNamespace="http://education.toorosystems.com/",
name="return", partName="return")
    @WebMethod(operationName="getTeacher", exclude=false)
    public Teacher getTeacher(@WebParam(targetNamespace="
http://education.toorosystems.com/", name="course", mode=WebParam.Mode.IN)
    Course course);
}

*c)* The implementation
package com.toorosystems.education;

import javax.xml.ws.WebServiceClient;

//@WebServiceClient(name="com.toorosystems.education.UniversityImpl",
targetNamespace="http://education.toorosystems.com/")
public class UniversityImpl implements University {

    public UniversityImpl() {}
    public Teacher getTeacher(Course course) {
        System.out.println("getTeacher called...");
        return new Teacher("Mr. Tom", 52, "Computer Science" +
course.getName());
    }

}


*d)* The Server
package com.toorosystems.education;

import org.apache.cxf.aegis.databinding.AegisDatabinding;
import org.apache.cxf.frontend.ServerFactoryBean;

public class Server {

    public static void main(String[] args) {
        // Create our service implementation
        System.out.println("Starting server ...");
        ServerFactoryBean svrFactory = new ServerFactoryBean();
        svrFactory.setServiceClass(University.class);
        svrFactory.setAddress("http://localhost:9090/TV");
        svrFactory.setServiceBean(new UniversityImpl());

        // comment me to use JAXB
        svrFactory.getServiceFactory().setDataBinding(new
AegisDatabinding());

        svrFactory.create();
        System.out.println("Server started!");
    }
}

*e)* The client
package com.toorosystems.education;

import org.apache.cxf.aegis.databinding.AegisDatabinding;
import org.apache.cxf.frontend.ClientProxyFactoryBean;

public class Client {

    public static void main(String[] args) {
        // see
http://cwiki.apache.org/CXF20DOC/introduction-to-aegis-21.html
        ClientProxyFactoryBean factory = new ClientProxyFactoryBean();
        // comment me to use JAXB
        factory.getServiceFactory().setDataBinding(new AegisDatabinding());

        factory.setServiceClass(University.class);
        factory.setAddress("http://localhost:9090/TV");
        University client = (University) factory.create();

        Teacher tr = client.getTeacher(new Course(40, "Intro to CS",
"Introductory Comp Sci"));
        System.out.println("Response is: " + tr.getName() + ", " +
tr.getAge() + ", " + tr.getDepartment());
    }
}


Any pointers will be appreciated,

Judes T

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