[ https://issues.jboss.org/browse/JGRP-1795?page=com.atlassian.jira.plugin.... ] Richard Achmatowicz commented on JGRP-1795: ------------------------------------------- The problem with the error message (which is only thrown if the assert is triggered) can be corrected this way: {noformat} private static void check(final int num_expected_msgs, Collection<Integer>... lists) { for(Collection<Integer> list: lists) { System.out.println("list: " + list); } for(Collection<Integer> list: lists) { Collection<Integer> missing=new TreeSet<Integer>(); if(list.size() != num_expected_msgs) { for(int i=1; i <= num_expected_msgs; i++) // this line changed missing.add(i); missing.removeAll(list); assert list.size() == num_expected_msgs : "expected " + num_expected_msgs + " elements, but got " + list.size() + " (list=" + list + "), missing=" + missing; } } } {noformat} You are receiving integers [1,..,20] and creating the missing list from [0,..,19]. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators For more information on JIRA, see: http://www.atlassian.com/software/jira