1.if an exception occurs while unmarshalling the call header 2.if the protocol for the return value is invalid 3.if a java.io.IOException occurs unmarshalling parameters (on the server side) or the return value (on the client side). 4.if a java.lang.ClassNotFoundException occurs during unmarshalling parameters or return values 5.if no skeleton can be loaded on the server-side; note that skeletons are required in the 1.1 stub protocol, but not in the 1.2 stub protocol. 6.if the method hash is invalid (i.e., missing method). 7.if there is a failure to create a remote reference object for a remote object's stub when it is unmarshalled.
2.if the protocol for the return value is invalid
3.if a java.io.IOException occurs unmarshalling parameters (on the server side) or the return value (on the client side).
4.if a java.lang.ClassNotFoundException occurs during unmarshalling parameters or return values
5.if no skeleton can be loaded on the server-side; note that skeletons are required in the 1.1 stub protocol, but not in the 1.2 stub protocol.
6.if the method hash is invalid (i.e., missing method).
7.if there is a failure to create a remote reference object for a remote object's stub when it is unmarshalled.