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 "%r" %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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