This is very tipical in Hibernate applications that have to serialize objects through the network be it GWT, Web Services, JSON, etc. Hibernate will leave his own POJO in your objects for lazy initialization purposes. When GWT or a Web Service tries to serialize the objects and opens the hibernate POJO it will throw LazyInitializationException because the connection is already closed. What I've done in my applications is to clean the POJO of any Hibernate references. This is done with a Hibernate Cleaner class. On the web there are a couple of examples of this.
Regards, Néstor Boscán On Tue, Jan 25, 2011 at 2:33 PM, Debashish <mr.debash...@gmail.com> wrote: > Hi > > I am trying for a sample using GWT and database layer as Hibernate > with Oracle on Google Aps server. > > I have done a sample for Hibernate with JSP as presentation layer, > which is working fine. > But the same approach is not working with GWT. > > Here is a verygood link on this topic > > http://code.google.com/webtoolkit/articles/using_gwt_with_hibernate.html > and my approach is almost similar. > > I have followed the below approach, > The RemoteServiceServlet makes a call to Hibernate layer and tries the > initializes the SessionFactory as below, > sessionFactory = new > Configuration().configure().buildSessionFactory(); > > I have added the jars necessary for the Hibernate layer (and > classes12.jar for oracle driver). > > However while running , it is giving me an error as below, > > -------------------------------------------------------------------------------------------------------- > Initial SessionFactory creation failed.java.lang.NoClassDefFoundError: > java.net.Socket is a restricted class. Please see the Google App > Engine developer's guide for more details. > [ERROR] javax.servlet.ServletContext log: Exception while dispatching > incoming RPC call > com.google.gwt.user.server.rpc.UnexpectedException: Service method > 'public abstract java.lang.Long > > com.google.musicstore.client.MusicStoreService.saveAccount(com.google.musicstore.client.dto.AccountDTO)' > threw an unexpected exception: java.lang.ExceptionInInitializerError > at > com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java: > 378) > > -------------------------------------------------------------------------------------------------------- > I have one through some of the threads which suggested me to download > the google apps jar files and try it. I have downladed it. but there > is no proper direction on how to make use of which jar file. > > Have anybody tried the same. Please let me know if anything I am doing > wrong. > *** Note that I am using Oracle 9.2 as local database. > > Thanks > Dev > > -- > You received this message because you are subscribed to the Google Groups > "Google Web Toolkit" group. > To post to this group, send email to google-web-toolkit@googlegroups.com. > To unsubscribe from this group, send email to > google-web-toolkit+unsubscr...@googlegroups.com<google-web-toolkit%2bunsubscr...@googlegroups.com> > . > For more options, visit this group at > http://groups.google.com/group/google-web-toolkit?hl=en. > > -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to google-web-toolkit@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
