JIRA: https://jira.springsource.org/browse/INT-3283 INT-3236: Remove deprecated `AbstractConnectionFactory.close` JIRA: https://jira.springsource.org/browse/INT-3236 INT-3283: Remove `selectorLock` As far as the issue in JVM's `AbstractSelectableChannel` was fixed in Java 7 and 8, just catch entire `Exception` on `stop()`.