JIRA: https://jira.spring.io/browse/INT-4023 There is no guaranty that following `System.currentTimeMillis()` return the same value. That is how the `assertEquals()` test for `created` and `modified` value may fail sporadically. * Fix `MongoDbMessageStore` and `ConfigurableMongoDbMessageStore` do not use a new `System.currentTimeMillis()` in case of `group create` **Cherry-pick to 4.2.x**