Hi Noor, In order to support polymorphism, GWT-RPC generates a serializer and deserializer for the entire type hierarchy (all sub-classes) of any types used as arguments or return types in a service method. The use of Object is explicitly disallowed in RPC in order to prevent the explosion of type serializers that would result.
Didier's workaround is a good one, as it will create serializer / deserializer pairs only for your entities vs. for every Java class in your app as it would if GWT were to allow Object. /dmc On Thu, Dec 16, 2010 at 11:45 PM, Didier Durand <[email protected]> wrote: > > Hi, > > Does the object you want to send implement Serializable ? It's > required > > Then in your case when not just define > > class MyObject extends Object implements Serializable { > ... > } > > Then, you will be able to carry MyObject and its child classes over > RPC. > > regards > > didier > > On Dec 17, 5:22 am, Noor <[email protected]> wrote: >> Using GWT RPC, we cannot send a variable of the type OBJECT. >> >> I am trying to do this >> >> Service Interface: >> >> Boolean SaveObjectIntoDatabase(Object Entity); >> >> ServiceAsync: >> >> void SaveObjectIntoDatabase(Object Entity,AsyncCallback <Boolean> >> Callback); >> >> This is because if we are using hibernate on the back end , we can >> just do >> >> e.g. public Boolean SaveObjectIntoDatabase(Object Entity) >> { >> Transaction tx = null; >> >> //here we can choose about the object nature >> if (Entity.getClass().equals(A)) >> { >> Entity=(A)Entity; >> } >> >> if (Entity.getClass().equals(B)) >> { >> Entity=(B)Entity; >> } >> //like this we can continue on saving an object >> //this would be a generic fuction just for saving >> hibernate object >> //making life much easier than creating an function for >> every type of Class >> >> try >> { >> tx=session.beginTransaction(); >> tx.begin(); >> session.update(Entity); >> tx.commit(); >> return true; >> } >> catch (Exception e) >> { >> tx.rollback(); >> e.printStackTrace(); >> return false; >> } >> } > > -- > You received this message because you are subscribed to the Google Groups > "Google Web Toolkit" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/google-web-toolkit?hl=en. > > -- David Chandler Developer Programs Engineer, Google Web Toolkit http://googlewebtoolkit.blogspot.com/ -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
