Jetty Web Service and Persistence.xml

Hello,
I am writing a web application with Vaadin using Eclipse Kepler. I already use GlassFish 4.0 as a webserver and I can deploy and run the application in localhost and go furthure (In this case I mean geting a query using JP QL). But because it is getting a long time to deploy with Glassfish I decided to use Jetty. It is much faster to deploy. I installed Jetty in eclipse and removed Glassfish in server tab, then deployed the application and ran in the browser and it works fine. The problem starts when application starts to run the first query using JP QL. I have to add that I use eclipselink as JPA and here is the my persistence.xml file :

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
    version="2.0">
    <persistence-unit name="jrsdbmysql"
    transaction-type="RESOURCE_LOCAL" >
        <!-- <provider>org.hibernate.ejb.HibernatePersistence</provider>  -->
        <class>com.jrs.entities.Benutzer</class>
        <properties>
            <property name="eclipselink.logging.level" value="OFF" />
            <property name="eclipselink.jdbc.driver" value="com.mysql.jdbc.Driver" />
               <property name="eclipselink.jdbc.url" value="jdbc:mysql://localhost:3306/jrsdbmysql" />
            <property name="eclipselink.jdbc.user" value="root" />
            <property name="eclipselink.jdbc.password" value="root" />
            <property name="eclipselink.ddl-generation" value="none" />
            <property name="eclipselink.ddl-generation.output-mode" value="database" />
            <property name="eclipselink.orm.throw.exceptions" value="true" />
        </properties>
    </persistence-unit>
</persistence

because Jetty can work only with web.xml file I added this file under : WebContent/WEB-INF-The web.xml file is like this :

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN" "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app>
  <servlet>
    <servlet-name>jrs Application</servlet-name>
    <servlet-class>com.vaadin.server.VaadinServlet</servlet-class>
    <init-param>
      <param-name>UI</param-name>
      <param-value>com.jrs.main.JrsUI</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>jrs Application</servlet-name>
<url-pattern>/*</url-pattern>
  </servlet-mapping>
</web-app>

Now, when I run the applicantion and it wants to does the query I getting the following error :

com.vaadin.server.ServerRpcManager$RpcInvocationException: Unable to invoke method click in com.vaadin.shared.ui.button.ButtonServerRpc
    at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:170)
    at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:118)
    at com.vaadin.server.communication.ServerRpcHandler.handleBurst(ServerRpcHandler.java:207)
    at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:111)
    at com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:91)
    at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:37)
    at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1371)
    at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:238)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:401)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:945)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:756)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:168)
    ... 23 more
Caused by: com.vaadin.event.ListenerMethod$MethodException: Invocation of method buttonClick in com.jrs.main.JrsUI$1 failed.
    at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:528)
    at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:167)
    at com.vaadin.server.AbstractClientConnector.fireEvent(AbstractClientConnector.java:969)
    at com.vaadin.ui.Button.fireClick(Button.java:368)
    at com.vaadin.ui.Button$1.click(Button.java:57)
    ... 28 more
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: jrsdbmysql]
 Unable to build EntityManagerFactory
    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:924)
    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:899)
    at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:59)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:63)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:47)
    at com.vaadin.addon.jpacontainer.JPAContainerFactory.createEntityManagerForPersistenceUnit(JPAContainerFactory.java:122)
    at com.jrs.main.JrsUI$1.buttonClick(JrsUI.java:74)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:508)
    ... 32 more
Caused by: org.hibernate.HibernateException: Connection cannot be null when 'hibernate.dialect' not set
    at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:98)
    at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:68)
    at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:174)
    at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:76)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:160)
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:132)
    at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1822)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1780)
    at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:96)
    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:914)
    ... 43 more

I can not understand it, why should I get an error regarding to Hibernate as hibernate.dialect when I am using eclipselink as JPA . Why it works with glassFish and not Jetty ?

Here is the code to create entityManager
EntityManager em = JPAContainerFactory.createEntityManagerForPersistenceUnit(“jrsdbmysql”)
Can anyone help me to fix it ?
Mybae I have to add something in web.xml file ?

P.S. It is not a Maven created project. Just normal in ecllipse new vaadin project.

In your
persistence.xml
you have commented out your provider. Add
org.eclipse.persistence.jpa.PersistenceProvider
as your provider and it could work a bit better.

I uncommented the provider and I get the same error. (I already checked both options- with and without provider)