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

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Java

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

Summary

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.

Properties

Class Name

clone Non-cloneable (Java)

Significance

reliability

Mnemonic

JAVA.CLASS.CLONE.CNC

Example

// TestClone1.java
public class TestClone1 {

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

Resolution

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.

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.

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