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Why should remote method arguments/return types always be Serializable

 
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Hi all,

I have just started off with EJB and i cant make sense that whay should my argument/return types of method must be of Serializable type, for a remote Object.

Again, if it is Serializable, then the Class 'es must be present in the remote client, if i want to deserialize my remote Object/ stub. In that case what is the point of having a RPC?? Please help me out as I am really confusing myself!!!
 
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Remote method should have arguments and return types serializable because you are going through a remote call, that is, passing data through the network.
 
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