Non-final 'clone()' in secure context

Reports clone() methods without the final modifier.

Since clone() can be used to instantiate objects without using a constructor, allowing the clone() method to be overridden may result in corrupted objects, and even in security exploits. This may be prevented by making the clone() method or the enclosing class itself final.

Example:

  class Main implements Cloneable {
    @Override
    protected Object clone() throws CloneNotSupportedException {
      return super.clone();
    }
  }

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

NonFinalClone

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Java | Security

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection NonFinalClone

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

IntelliJ IDEA 2025.2

Inspection Details
By default bundled with:	IntelliJ IDEA 2025.2, Qodana for JVM 2025.2,

Last modified: 18 September 2025