As you can see from the stacktrace, StandardSession implements a custom writeObject(), which considers only those session attributes that implement "java.io.Serializable" to be included in the session's serialized representation.
What is the type of the session attribute named "BuscarPeliculasTitulo", which is causing the NotSerializableException to be thrown? It looks like while the class itself implements "java.io.Serializable", an object on its graph may not.
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