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CodeSonar® 9.2p0 CONFIDENTIAL CodeSecure Inc
Java

JAVA.CLASS.CLONE.CNC : clone Non-cloneable (Java)

要旨

Method clone() is defined in a non-cloneable class.

The clone() method is used to generate a clone of an object, that is, a distinct instance with the same behavior as the original one. The default implementation in java.lang.Object checks that the object to clone either implements the java.lang.Cloneable interface or throws a java.lang.CloneNotSupportedException.

In order to clone an object it is generally sufficient to implement java.lang.Cloneable and use the default implementation of clone(). It is also possible to override that default implementation. Note that a class that inherits the default implementation allows its subclasses to implement java.lang.Cloneable and clone its instances.

プロパティ

クラス名 clone Non-cloneable (Java)
日本語クラス名 clone Non-cloneable (Java)
クラス分類 信頼性 (reliability)
ニーモニック JAVA.CLASS.CLONE.CNC
カテゴリー
CWE CWE:491 Public cloneable() Method Without Final ('Object Hijack')
CERT-Java CERT-Java:OBJ07-J Sensitive classes must not let themselves be copied
対応言語 Available for Java and Kotlin.
有効/無効設定 このワーニングクラスのチェックはデフォルトで有効になっています。チェックを無効にするにはプロジェクト設定ファイル （configuration file）に以下の WARNING_FILTER ルールを追加してください。 
WARNING_FILTER += discard class="clone Non-cloneable (Java)"

例 

// TestClone1.java
public class TestClone1 {

  @Override
  public Object clone() {
      return new TestClone1(); // clone Non-cloneable (Java) warning issued here
  }
}

解決法

Check that clone() is only redefined in classes that implement java.lang.Cloneable. Check that the default implementation of clone() is only used for classes that have explicitly declared to implement java.lang.Cloneable.

関連のある設定ファイルパラメータ

設定ファイルの以下のパラメータがこのワーニングクラスのチェックに影響します。

 

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