Deploy issue of GWT with Hibernate

Hello, everyone:

i am playing with GWT(2.6) with Hibernate recently. the integration works well in devmode, i can operate local mysql db correctly. But when i tried to deploy the war to my local tomcat server, i got following error:

27-Sep-2015 16:48:45.335 SEVERE [http-apr-8080-exec-9] org.apache.catalina.core.ApplicationContext.log Exception while dispatching incoming RPC call

 com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract com.meta.myapp.shared.ResponseDataBox com.meta.myapp.client.rpc.MyappService.remoteCall(com.meta.myapp.shared.RequestDataBox)' threw an unexpected exception: java.lang.NullPointerException

at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:389)

at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:579)

at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:265)

at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:305)

at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

        ...........

at java.lang.Thread.run(Unknown Source)

Caused by: java.lang.NullPointerException

at com.meta.myapp.server.HibernateUtil.getSessionFactory(HibernateUtil.java:55)

at com.meta.myapp.server.SchedulerServiceServlet.remoteCall(SchedulerServiceServlet.java:49)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:561)

... 26 more

Here was how my HibernateUtil implemented, mostly following the guide on http://www.gwtproject.org/articles/using_gwt_with_hibernate.html

It looks like the static segment was not invoked at all.

public class HibernateUtil {

        

        private static final SessionFactory sessionFactory;   

        private static Configuration config;

        

        static {

            try {   

                config = new Configuration();

                

                // addMapping(config);

                // Create the SessionFactory from hibernate.cfg.xml   

                sessionFactory = config.configure().buildSessionFactory();  

            } catch (Throwable ex) {   

                System.err.println("Initial SessionFactory creation failed.\n" + ex);   

                throw new ExceptionInInitializerError(ex);   

            }   

        }   

      

        public static SessionFactory getSessionFactory() {   

            return sessionFactory;   

        }   

               

}

Here was my server.xml of tomcat 8.0:

      <Host name="localhost"  appBase="c:/yshaoxp/workspace/Myapp"

            unpackWARs="true" autoDeploy="true">

        <!-- SingleSignOn valve, share authentication between web applications

             Documentation at: /docs/config/valve.html -->

        <!--

        <Valve className="org.apache.catalina.authenticator.SingleSignOn" />

        -->

        <!-- Access log processes all example.

             Documentation at: /docs/config/valve.html

             Note: The pattern used is equivalent to using pattern="common" -->

        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"

               prefix="localhost_access_log" suffix=".txt"

               pattern="%h %l %u %t &quot;%r&quot; %s %b" />

<Context path="" reloadable="true" docBase="war" debug="1"/>

      </Host>

and, here is my hibernate.cfg.xml:

<hibernate-configuration>

<session-factory>

<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>

<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>

<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/myapp</property>

<property name="hibernate.connection.username">root</property>

<property name="hibernate.connection.password">root</property>

<property name="show_sql">true</property>

<property name="hibernate.hbm2ddl.auto">update</property>

<!-- Enable Hibernate's automatic session context management -->

                <property name="current_session_context_class">thread</property>

                <!-- Disable the second-level cache -->

                <property name="cache.use_second_level_cache">false</property>

        

</session-factory>

</hibernate-configuration>

It works well when i work on devmode with eclipse. Your support is appreciated!

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