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* `SftpSessionFactoryTests.concurrentGetSessionDoesntCauseFailure()` may not report properly into an `ArrayList` from another thread. Use `asyncTaskExecutor.submitCompletable()` instead and deal with their result afterward. * Use `CompletableFuture` for the `TcpListener` logic in the `FailoverClientConnectionFactoryTests.failoverAllDeadAfterSuccess()`