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Why am I having an InvalidClassException thrown during the serialization of my object which implements the Externalizable interface?

April 26, 2017externalizable implements interface invalidclassexception object serialization thrown

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Why am I having an InvalidClassException thrown during the serialization of my object which implements the Externalizable interface?

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Location: http://www.jguru.com/faq/view.jsp?EID=2598 Created: Dec 14, 1999 Modified: 1999-12-22 23:59:24.821 Author: Govind Seshadri (http://www.jguru.com/guru/viewbio.jsp?EID=14) Unlike objects which implement the Serializable interface, it is mandatory for objects implementing the Externalizable interface to also implement a public no-arg constructor. This constructor is the very first thing that is invoked by readExternal() when reconstructing the object from the bytestream. If a public no-arg constructor is absent, then an InvalidClassException is immediately thrown.