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There is a newer version: 8.6.0.37351

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) { ... }
}