Jersey Errors

Hi all,

I followed instructions on Dagfinn Parnas blog Exposing a REST API from #SAPNWCloud . But I get errors. I also read comments about errors but no way.

Here is my code and error:

om.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes.

web.xml:

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">  <display-name>persistence-with-jpa</display-name>  <welcome-file-list>    <welcome-file>index.html</welcome-file>    <welcome-file>index.htm</welcome-file>    <welcome-file>index.jsp</welcome-file>    <welcome-file>default.html</welcome-file>    <welcome-file>default.htm</welcome-file>    <welcome-file>default.jsp</welcome-file>  </welcome-file-list>  <servlet>    <servlet-name>Jersey REST Service</servlet-name>    <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>    <init-param>      <param-name>javax.ws.rs.Application</param-name>      <param-value>com.sap.netweaver.cloud.sample.persistence.MyRestApp</param-value>    </init-param>    <load-on-startup>1</load-on-startup>  </servlet>  <servlet-mapping>    <servlet-name>Jersey REST Service</servlet-name>    <url-pattern>/api/*</url-pattern>  </servlet-mapping>  <servlet>    <description></description>    <display-name>PersistenceWithJPAServlet</display-name>    <servlet-name>PersistenceWithJPAServlet</servlet-name>    <servlet-class>com.sap.netweaver.cloud.sample.persistence.PersistenceWithJPAServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>PersistenceWithJPAServlet</servlet-name>    <url-pattern>/</url-pattern>  </servlet-mapping>  <resource-ref>    <res-ref-name>jdbc/DefaultDB</res-ref-name>    <res-type>javax.sql.DataSource</res-type>  </resource-ref>  <servlet>    <description>JAX-RS Tools Generated - Do not modify</description>    <servlet-name>JAX-RS Servlet</servlet-name>    <servlet-class>JaxClass</servlet-class>    <load-on-startup>1</load-on-startup>  </servlet>  <servlet-mapping>    <servlet-name>JAX-RS Servlet</servlet-name>    <url-pattern>/jaxrs/*</url-pattern>  </servlet-mapping></web-app>

MyRestApp.java:

package com.sap.netweaver.cloud.sample.persistence;


import java.util.HashSet;
import java.util.Set;


import javax.ws.rs.core.Application;


public class MyRestApp extends Application {
          public Set<Class<?>> getClasses() {                    Set<Class<?>> s = new HashSet<Class<?>>();                    s.add(FeedResource.class);                    return s;          }

}