FULL PRODUCT VERSION :


A DESCRIPTION OF THE PROBLEM :
If list contains itself then hashCode() loops forever (undetected recursion).
Items may be added/removed but operations requiring hashCode() (e.g. adding list to Map as key) results in stack overflow.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
List list=new ArrayList();
list.add(list);
list.hashCode();

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
some int value
ACTUAL -
exception

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "main" java.lang.StackOverflowError
at java.util.AbstractList$Itr.<init>(AbstractList.java:318)
        ...

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class TestListStackOverflow {

public static void main(String[] args) {

List list=new ArrayList();
list.add(list);
list.hashCode();

}

}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
change specification or introduce loopback detection in hasCode evaluation.