writing hessian service - spring

Question

I am new to Spring and Hessian and never used them before.
I want to write a small Hello World Program which clearly shows how this service works.
I am using Maven for list project details and dependencies.
The resources for hessian available online are not complete step-by-step guide.
would appreciate if I get help form someone who has worked writing hessian services

Answer 1

The steps for implementing a Hessian-callable service are:
Create a Java interface defining methods to be called by clients.
Write a Java class implementing this interface.
Configure a servlet to handle HTTP Hessian service requests.
Configure a HessianServiceExporter to handle Hessian service requests from the servlet by delegating service calls to the Java class implementing this interface.
Let's go through an example. Create a Java interface:
public interface EchoService {
String echoString(String value);
}
Write a Java class implementing this interface:
public class EchoServiceImpl implements EchoService {
public String echoString(String value) {
return value;
}
}
In the web.xml file, configure a servlet:
<servlet>
<servlet-name>/EchoService</servlet-name>
<servlet-class>org.springframework.web.context.support.HttpRequestHandlerServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>/EchoService</servlet-name>
<url-pattern>/remoting/EchoService</url-pattern>
</servlet-mapping>
Configure an instance of the service class in the Spring application context:
<bean id="echoService" class="com.example.echo.EchoServiceImpl"/>
Configure the exporter in the Spring application context. The bean name must match the servlet name.
<bean
name="/EchoService"
class="org.springframework.remoting.caucho.HessianServiceExporter">
<property name="service" ref="echoService"/>
<property name="serviceInterface" value="com.example.echo.EchoService"/>
</bean>

Answer 2

The client has to create a proxy of the remote interface. You could simply write a JUnit-Test:
HessianProxyFactory proxyFactory = new HessianProxyFactory();
proxyFactory.setHessian2Reply(false);
proxyFactory.setHessian2Request(false);
com.example.echo.EchoService service = proxyFactory.create(
com.example.echo.EchoService, "http://localhost:8080/<optional-context/>remoting/EchoService");
Assert.equals(service.echoString("test"), "test");