[JAVA] Json Array generated model overrides equals

Description

When generates a model for an Array of JSON, a class that extends ArrayList is created overriding equals and hashcode instead of using the ones from ArrayList, also the equals is wrong and returns true when other is not Null and is from same class, regardless from the items on the list

Swagger-codegen version

2.3.0-SNAPSHOT

Swagger declaration

{
  "definitions": {
    "Things": {
      "type": "array",
      "items": {
        "$ref": "#/definitions/Thing"
      }
    }
  }
[...]
}

generates:

public class Things extends ArrayList<Thing>  {
  @Override
  public boolean equals(java.lang.Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    return true;
  }

  @Override
  public int hashCode() {
    return Objects.hash(super.hashCode());
  }
}

Suggest a fix/enhancement

This generated code is wrong, because it is overriding both equals method and hashcode method in such a way that be from the same class is condition enough for equals to return True, and also hashcode is violating Object.hashcode contract

These models should rely on both equals and hashcode implementations from ArrayList

Use the supplied Swagger declaration to reproduce the generated Things model, then locate the Java model template that emits equals and hashCode. Check how the generated ArrayList subclass handles these methods; done means the model relies on ArrayList behavior and no longer treats same-class instances as equal regardless of items.