ExecutorService executorService = Executors.newFixedThreadPool(10); CompletableFuture.supplyAsync(() -> doSomething()) .thenApplyAsync(result -> processResult(result)); HikariConfig config = new HikariConfig(); config.setJdbcUrl("jdbc:mysql://localhost:3306/mydb"); config.setUsername("username"); config.setPassword("password"); HikariDataSource dataSource = new HikariDataSource(config); Connection connection = dataSource.getConnection();