ObjStoreBrowser can return stale Uid if the machine is very fast or the machines clock has a low fidelity --------------------------------------------------------------------------------------------------------- Key: JBTM-2291 URL: https://issues.jboss.org/browse/JBTM-2291 Project: JBoss Transaction Manager Issue Type: Bug Components: Tooling Reporter: Tom Jenkinson Assignee: Tom Jenkinson Fix For: 5.0.4 ObjStoreBrowser::probe uses System.currentTimeMillis to determine whether its list of allUids contains stale date during updateMBeans call. Now if you imagine a clock which never moved on (low fidelity) then this would mean that a Uid was never eligible to be reaper from this list. Or imagine a machine that is very fast (my laptop for example) and it is possible that probe, remove entry, probe can all be called in the same millisecond.