An ``++Externalizable++`` class is one which handles its own ``++Serialization++`` and deserialization. During deserialization, the first step in the process is a default instantiation using the class' no-argument constructor. Therefore an ``++Externalizable++`` class without a no-arg constructor cannot be deserialized.

== Noncompliant Code Example

----
public class Tomato implements Externalizable {  // Noncompliant; no no-arg constructor

  public Tomato (String color, int weight) { ... }
}
----

== Compliant Solution

----
public class Tomato implements Externalizable {

  public Tomato() { ... }
  public Tomato (String color, int weight) { ... }
}
----
