that the <code><a href="../../../reference/java/io/ObjectInputStream.html#readObject()">readObject()</a></code> method has detected
 an exception marker in the input stream. This marker indicates that exception
 occurred when the object was serialized, and this marker was inserted instead
 of the original object. It is a way to "propagate" an exception from the code
 that attempted to write the object to the code that is attempting to read the
 object.</p>



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