Re: GWT with Hibernate and Oracle
Hi Néstor,
I have followed all the steps which required a Hibernate application
to work.
And this sample hibernate module is working fine without GWT as UI.
However while connecting to any Database we need to put Driver class
in the classpath and
hibernate also requires the Classes12.jar or ojdbc14.jar at it's
classpath.
This is required so that it can understand the driver property placed
in hibernate.cfg.xml file
oracle.jdbc.driver.OracleDriver
And probaly this class is not allowed in Google APP and I am getting
an error as
---
Caused by: java.lang.NoClassDefFoundError: java.net.Socket is a
restricted class. Please see the Google App Engine
developer's guide for more details.
---
*** This is the local database in my case and I am absolutely getting
no way to resolve it.
Please sugggest me if any other approach / websites to follow for
this.
Thanks
Debashish
On Feb 6, 1:55 am, Néstor Boscán wrote:
> Hi
>
> I checked the link that you sent and this is will work of course but you
> will have to create a lot of DTO objects for your application and map the
> POJO objects from Hibernate to the DTO which will require a lot of coding.
> The example should work, your DTOs should be serialized, Now what I don't
> understand is that if you're using Hibernate why use JDBC directly?. You can
> get a Connection to your database from the Session object or create an a
> SQLQuery. From what I'm reading it looks like you're using java.net.Socket
> on the GWT Client side and this is not a valid class.
>
> Regards,
>
> Néstor Boscán
>
>
>
> On Sat, Feb 5, 2011 at 2:52 PM, Debashish wrote:
> > Hi Néstor,
>
> > Thank you for the response regarding the Hibernate with GWT.
>
> > However I have followed the similar approach given in the below link
>
> >http://code.google.com/webtoolkit/articles/using_gwt_with_hibernate.html
> > which suggets to use DTO approach to map the hibernate domain object
> > to DTO
> > and passed to the data to GWT layer.
>
> > I have a query on the Local Database connectivity from GWT. Is it
> > possible to make a
> > JDBC call(using Oracle Thin Driver). I have tried a normal jdbc
> > connection from GWT
> > using classes12.jar file in classpath and using
> > Class.forName("Oracle.jdbc.driver.OracleDriver").
> > I have deployed on Google Apps server.
>
> > I am getting the below error message while while running the
> > application.
>
> > ------
> > 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.music
> > store.client.dto.AccountDTO)'
> > threw an unexpected exception: java.lang.ExceptionInInitializerError
> > at
> > com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:
> > 378)
>
> > -----
>
> > Could you please suggest me of any good links or site which provides
> > an approach to develope GWT aplications
> > using local database.
>
> > Thanks
> > Dev
>
> > On Jan 26, 5:20 pm, Néstor Boscán wrote:
> > > 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
> > 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
Re: GWT with Hibernate and Oracle
Hi Néstor,
Thank you for the response regarding the Hibernate with GWT.
However I have followed the similar approach given in the below link
http://code.google.com/webtoolkit/articles/using_gwt_with_hibernate.html
which suggets to use DTO approach to map the hibernate domain object
to DTO
and passed to the data to GWT layer.
I have a query on the Local Database connectivity from GWT. Is it
possible to make a
JDBC call(using Oracle Thin Driver). I have tried a normal jdbc
connection from GWT
using classes12.jar file in classpath and using
Class.forName("Oracle.jdbc.driver.OracleDriver").
I have deployed on Google Apps server.
I am getting the below error message while while running the
application.
--
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.music
store.client.dto.AccountDTO)'
threw an unexpected exception: java.lang.ExceptionInInitializerError
at
com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:
378)
-
Could you please suggest me of any good links or site which provides
an approach to develope GWT aplications
using local database.
Thanks
Dev
On Jan 26, 5:20 pm, Néstor Boscán wrote:
> 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 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
> > "G
GWT with Hibernate and Oracle
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. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
