The method clone() should only be implemented if the class implements the Cloneable interface with the exception of a final method that only throws CloneNotSupportedException. This version uses PMD's type resolution facilities, and can detect if the class implements or extends a Cloneable class. Example:
public class MyClass {
  public Object clone() throws CloneNotSupportedException {
    return foo;
  }
}

This rule is deprecated, use {rule:squid:S1182} instead.