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Operation parameters and returned values, as well as attribute values, must be serializable.
In addition, these classes must be available on the client side.
From the 1st exception you get it looks as if you're trying to return a WebAppLoader, or if
you're trying to return an object that has a reference to a WebAppLoader.
The second exception seems to be a different problem: namely it looks as if the
client and server have different version of the same class (they have different version
The fact that the class which you are trying to deserialize are a ContainerBase and
a WebAppLoader seems very suspicious - I don't know exactly what a WebAppLoader
or a ContainerBase are, but from the name it looks as if they most probably shouldn't be
used as a parameter/attribute within an MBean!
What is this MBean that you're trying to access: is that something you wrote?
JMX, SNMP, Java, etc...