Vert.x-闲置一段时间后卡住

Question

下面是我在Vertx上的代码。使用SQLclient PreparedQuery从数据库中获取数据，但是在30分钟的空闲时间之后，它被卡住了。

  

Vert.x版本-3.8.0

//initialized one on application startup
var mysqlOpts = new MySQLConnectOptions()
        .setHost(jdbcHost)
        .setPort(3306)
        .setDatabase(jdbcSchema)
        .setUser(jdbcUser)
        .setPassword(jdbcPass)
        .setCachePreparedStatements(true);

var mysqlClient = MySQLPool.pool(vertx, mysqlOpts, new PoolOptions().setMaxSize(20 * Runtime.getRuntime().availableProcessors()));

// called every time on GET request works fine.
// After some idle time say 1hr.The execution at below gets stuck. (The GET request gets stuck).If I kill the process and try again it starts working.
mysqlClient.preparedQuery(SIMPLE_SELECT_QUERY ,tuple , ar -> {
    // some code here
 }); 

请告知即使闲置一段时间后仍需要做什么。我们不会一直收到请求。