com.caucho.hessian.client.HessianRuntimeException : com. caucho.hessian.io.HessianProtocolException: ‘<' is unknown code... here is a solution to the problem.
com.caucho.hessian.client.HessianRuntimeException : com. caucho.hessian.io.HessianProtocolException: ‘<' is unknown code
I’m trying to establish basic Hessian communication between two Android devices.
The client sends the message AsyncTask
public class AsyncHessian extends AsyncTask<String,String,String> {
@Override
protected String doInBackground(String... params) {
String url = "http://192.168.1.37:8080/test/test";
try{
HessianProxyFactory factory = new HessianProxyFactory();
TService basic = (TService) factory.create(TService.class, url);
basic.hello();
Log.i("Hello", "Hessian!");
}
catch(Exception e){e.printStackTrace(); }
return "";
}
Implementation of the server-side interface
public class TServiceImpl extends HessianServlet implements TService{
public static void main(String[] args) throws Exception {
Server server = new Server(8080);
Context context = new Context(server, "/", Context.SESSIONS);
context.addServlet(TServiceImpl.class, "/test");
server.start();
}
public void hello() {
System.out.println("Hello Hessian!");
}
Interface
public interface TService {
public void hello();
The server is running jetty on the Android device.
Messages are being sent from the application to the server.
I’m sure the message has reached its destination because I get an ECONNREFUSED error when jetty stops. Now, when it opens, I get its title.
Solution
Configure your servlets in your web.xml
<servlet>
<servlet-name>testService</servlet-name>
<servlet-class>com.caucho.hessian.server.HessianServlet</servlet-class>
<init-param>
<param-name>home-class</param-name>
<param-value>TServiceImpl's full name</param-value>
</init-param>
<init-param>
<param-name>home-api</param-name>
<param-value>TService's full name</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>testService</servlet-name>
<url-pattern>/test</url-pattern>
</servlet-mapping>
See also: http://hessian.caucho.com/doc/hessian-overview.xtp#Configurationforstandardweb.xml