dataService.delete(sessionId);
        } finally {
            server.stop();
        }
    }

    @Test
    public void test_execute_2instanceTx() throws Exception {
        final CrawlerWebServer server1 = new CrawlerWebServer(0);
        server1.start();
        final CrawlerWebServer server2 = new CrawlerWebServer(0);
        server2.start();