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

[source,java]
----
public class Tomato implements Externalizable {  // Noncompliant; no no-arg constructor

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


== Compliant Solution

[source,java]
----
public class Tomato implements Externalizable {

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

ifdef::env-github,rspecator-view[]

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== Implementation Specification
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include::message.adoc[]

endif::env-github,rspecator-view[]