带有postgres的Java netty tcp服务器。查询无限期挂起

我在Netty上用tcp服务器编写Spring引导应用程序。服务获取消息并检查postgres数据库中的行。问题在于，在检查数据库中的记录时，服务挂起并停止处理来自tcp通道的其他消息

配置：

 @Bean
public void start() throws InterruptedException {
    log.info("Starting server at: {} ", tcpPort);
    EventLoopGroup bossGroup = new NioEventLoopGroup();
    EventLoopGroup workerGroup = new NioEventLoopGroup();

        ServerBootstrap b = new ServerBootstrap();
        b.group(workerGroup, bossGroup)
                .channel(NioServerSocketChannel.class)
                .childHandler(simpleTCPChannelInitializer)
                .childOption(ChannelOption.SO_KEEPALIVE, true);

        // Bind and start to accept incoming connections.
        ChannelFuture f = b.bind(tcpPort).sync();
        if(f.isSuccess())
            log.info("Server started successfully");
        f.channel().closeFuture().sync();

}

通道初始化：

 private final EventExecutorGroup sqlExecutorGroup = new DefaultEventExecutorGroup(16);

protected void initChannel(SocketChannel socketChannel) {
    socketChannel.pipeline().addLast(new StringEncoder());
    socketChannel.pipeline().addLast(new StringDecoder());
    socketChannel.pipeline().addLast(sqlExecutorGroup, simpleTCPChannelHandler);
}

数据库的配置和方法：

    @Override
public void processMessage(String atmRequest) {
        log.info("Receive tcp atmRequest: {}", atmRequest);
        checkDeviceInDatabase(deviceUid);
        log.info("Receive power up command");
}

private void checkDeviceInDatabase(String deviceUid) {
    statusConnectRepository.findById(deviceUid).orElseThrow(()
            -> new DeviceNotFoundException("DeviceUid: " + deviceUid + " was not found in database"));
}

在checkDeviceInDatabase（deviceUid）方法中，查询将永远挂起。 有人遇到过这样的问题吗