Reports the cases where the argument of a method call on a java.util.Collection or java.util.Map is a collection or map itself. This includes adding a collection to itself, for example, calling hashCode() on the self-containing collection, which can lead to a java.lang.StackOverflowError. Such situations may occur in the code with raw types as a result of copy-paste.

Example:


  ArrayList list = new ArrayList<>();
  list.add(list);
  return list.hashCode(); // throws StackOverflowException