Task2Analysis.java

/*
Task 2 - ConcurrentModificationException Analysis

1. Exact cause:
   ConcurrentModificationException occurs when a collection is structurally modified while it is being iterated
   by an Iterator/enhanced-for loop, and the modification is not performed through that same Iterator. ArrayList's
   iterator is fail-fast and detects that its expected modification count no longer matches the list's actual
   modification count.

2. Most likely code pattern at StatementProcessorService.java:142:

   for (Transaction transaction : transactions) {
       if (shouldRemove(transaction)) {
           transactions.remove(transaction);
       }
   }

   The enhanced-for loop internally uses an Iterator, but transactions.remove(transaction) modifies the ArrayList
   directly while the Iterator is still active.

3. Minimal safe code change:

   Iterator<Transaction> iterator = transactions.iterator();
   while (iterator.hasNext()) {
       Transaction transaction = iterator.next();
       if (shouldRemove(transaction)) {
           iterator.remove();
       }
   }

   The key minimal fix is to use iterator.remove() instead of list.remove(...) while iterating.
*/
class Task2Analysis {
}