The RMI/IIOP serialization machinery throws an exception
when marshaling a Serializable object containing a non-Serializable field,
as well as marshaling arrays whose component type is not Serializable.

E.g. while marshaling the following class:
public class Foo implements java.io.Serializable {
    java.lang.reflect.Method nonSerializableField;
}

the following exception is thrown:
java.lang.ClassCastException: java.lang.reflect.Method
        at com.sun.rmi.io.IIOPOutputStream.outputClassFields(IIOPOutputStream.java:570)
        at com.sun.rmi.io.IIOPOutputStream.defaultWriteObjectDelegate(IIOPOutputStream.java:158)
        at com.sun.rmi.io.IIOPOutputStream.outputObject(IIOPOutputStream.java:473)
        at com.sun.rmi.io.IIOPOutputStream.simpleWriteObject(IIOPOutputStream.java:120)
        at com.sun.rmi.io.ValueHandlerImpl.write_Value(ValueHandlerImpl.java:122)
        at com.sun.rmi.iiop.CDROutputStream.write_Value(CDROutputStream.java:704)