我在 github 搜索到一个有点年头了 但是可能有关的 issue ， 这个 issue 已经关闭了，本来还想留言来着
https://github.com/eclipse/paho.mqtt.java/issues/323
我使用 Spring-Integration-mqtt 模块发送和接收 MQTT 消息，发生以下异常：
```html
2024-10-22 10:56:45.161 [][] ERROR o.s.i.handler.LoggingHandler:250 - org.springframework.messaging.MessageHandlingException: Failed to publish to MQTT in the [bean 'mqttOutboundHandler' for component 'mqttOutboundFlow.org.springframework.integration.config.ConsumerEndpointFactoryBean#1'; defined in: 'class path resource [com/rms/config/mqtt/MqttConfig.class]'; from source: 'com.rms.config.mqtt.MqttConfig.mqttOutboundHandler(org.eclipse.paho.mqttv5.client.MqttConnectionOptions)'], failedMessage=GenericMessage [payload={"value":[],"unitId":741,"fieldName":"landingCall-down-front-1-32","isRunningData":false,"isError":false}, headers={replyChannel=nullChannel, errorChannel=, mqtt_qos=0, id=1237ba75-e408-10ff-e322-5f692dd8970e, mqtt_topic=status/741/landingCall-down-front-1-32, timestamp=1729565799271}]
at org.springframework.integration.mqtt.outbound.Mqttv5PahoMessageHandler.publish(Mqttv5PahoMessageHandler.java:283)
at org.springframework.integration.mqtt.outbound.Mqttv5PahoMessageHandler.handleMessageInternal(Mqttv5PahoMessageHandler.java:222)
at org.springframework.integration.handler.AbstractMessageHandler.doHandleMessage(AbstractMessageHandler.java:105)
at org.springframework.integration.handler.AbstractMessageHandler.handleWithMetrics(AbstractMessageHandler.java:90)
at org.springframework.integration.handler.AbstractMessageHandler.handleMessage(AbstractMessageHandler.java:70)
at org.springframework.integration.dispatcher.AbstractDispatcher.tryOptimizedDispatch(AbstractDispatcher.java:132)
at org.springframework.integration.dispatcher.UnicastingDispatcher.doDispatch(UnicastingDispatcher.java:148)
at org.springframework.integration.dispatcher.UnicastingDispatcher$1.run(UnicastingDispatcher.java:129)
at org.springframework.integration.util.ErrorHandlingTaskExecutor.lambda$execute$0(ErrorHandlingTaskExecutor.java:56)
at java.base/java.util.concurrent.ThreadPerTaskExecutor$TaskRunner.run(ThreadPerTaskExecutor.java:314)
at java.base/java.lang.VirtualThread.run(VirtualThread.java:311)
Caused by: Internal error, caused by no new message IDs being available (32001)
at org.eclipse.paho.mqttv5.client.internal.ExceptionHelper.createMqttException(ExceptionHelper.java:32)
at org.eclipse.paho.mqttv5.client.internal.ClientState.getNextMessageId(ClientState.java:1454)
at org.eclipse.paho.mqttv5.client.internal.ClientState.send(ClientState.java:511)
at org.eclipse.paho.mqttv5.client.internal.ClientComms.internalSend(ClientComms.java:155)
at org.eclipse.paho.mqttv5.client.internal.ClientComms.sendNoWait(ClientComms.java:218)
at org.eclipse.paho.mqttv5.client.MqttAsyncClient.publish(MqttAsyncClient.java:1530)
at org.eclipse.paho.mqttv5.client.MqttAsyncClient.publish(MqttAsyncClient.java:1499)
at org.springframework.integration.mqtt.outbound.Mqttv5PahoMessageHandler.publish(Mqttv5PahoMessageHandler.java:271)
... 10 more
```
环境:
- SpringBoot 3.2.5
- java21
- PahoMQTT1.2.5
下面是我的核心逻辑。我使用 Spring-Integration 集成流程配置了两个 Mqtt 客户端。一个用于接收信息，另一个用于发送消息。发送消息的频率约为每秒 5000 条消息。
```yaml
mqtt:
client-id-inbound: rms-inbound
client-id-outbound: rms-outbound
url: tcp://127.0.0.1:1883
username: rms
password: 123456
```
```
import java.util.concurrent.Executors;
@Configuration
@IntegrationComponentScan("com.rms.config")
@Slf4j
@ConfigurationProperties(prefix = "mqtt")
@Data
public class MqttConfig {
private String clientIdInbound;
private String clientIdOutbound;
private String url;
private String password;
private String username;
@Bean
public MqttConnectionOptions mqttConnectOptions(){
MqttConnectionOptions options = new MqttConnectionOptions();
options.setServerURIs(new String[] { url});
options.setUserName(username);
options.setPassword(password.getBytes());
options.setAutomaticReconnect(true);
return options;
}
@Bean
public ClientManager<IMqttAsyncClient, MqttConnectionOptions> clientManager(MqttConnectionOptions options) {
Mqttv5ClientManager clientManager = new Mqttv5ClientManager(options, clientIdInbound);
clientManager.setPersistence(new MqttDefaultFilePersistence());
return clientManager;
}
@Bean
public SimpleMessageConverter simpleMessageConverter(){
return new SimpleMessageConverter();
}
@Bean
public MessageHandler mqttOutboundHandler(MqttConnectionOptions connectionOptions) {
Mqttv5PahoMessageHandler messageHandler = new Mqttv5PahoMessageHandler(connectionOptions,clientIdOutbound);
messageHandler.setAsync(true);
messageHandler.setDefaultTopic("defaultTopic");
messageHandler.setDefaultQos(MqttQoS.AT_MOST_ONCE.value());
messageHandler.setConverter(simpleMessageConverter());
return messageHandler;
}
@Bean
public IntegrationFlow mqttOutboundFlow(MessageHandler mqttOutboundHandler){
return IntegrationFlow.from("mqttOutboundChannel")
.channel(MessageChannels.executor(Executors.newVirtualThreadPerTaskExecutor()))
.handle(mqttOutboundHandler)
.get();
}
@Bean
public IntegrationFlow statusInboundFlow(ClientManager<IMqttAsyncClient, MqttConnectionOptions> clientManage){
Mqttv5PahoMessageDrivenChannelAdapter messageProducer =
new Mqttv5PahoMessageDrivenChannelAdapter(clientManage, "status/+/#");
return IntegrationFlow.from(messageProducer)
.channel(MessageChannels.executor(Executors.newVirtualThreadPerTaskExecutor()))
.transform(Transformers.objectToString())
.transform(Transformers.fromJson(Prop.class))
.route(Prop.class,prop->{
if (Boolean.TRUE.equals(prop.getIsError())){
return "errorDataChannel";
}
else if (Boolean.TRUE.equals(prop.getIsRunningData())){
return "runningDataChannel";
}
else {
return "discardChannel";
}
})
.get();
}
@Bean
public CanProtocolLoader canProtocolLoader(){
return new CanProtocolLoader();
}
@Bean
public UnitErrorHandler errorLogHandler(LogService logService ){
return new UnitErrorHandler(logService);
}
@Bean
public UnitRunningDataHandler unitRunningDataHandler(LogService logService){
return new UnitRunningDataHandler(logService);
}
@Bean
public IntegrationFlow errorLogChannelFlow(UnitErrorHandler unitErrorHandler){
return IntegrationFlow.from("errorDataChannel")
.channel(MessageChannels.executor(Executors.newVirtualThreadPerTaskExecutor()))
.handle(unitErrorHandler)
.get();
}
@Bean
public IntegrationFlow runningDataChannelFlow(UnitRunningDataHandler runningDataHandler){
return IntegrationFlow.from("runningDataChannel")
.channel(MessageChannels.executor(Executors.newVirtualThreadPerTaskExecutor()))
.handle(runningDataHandler)
.get();
}
@Bean
public IntegrationFlow discardChannelFlow(){
return IntegrationFlow.from("discardChannel")
.channel(MessageChannels.executor(Executors.newVirtualThreadPerTaskExecutor()))
.handle(message -> {
})
.get();
}
}
```
```java
@Slf4j
@RequiredArgsConstructor
public class UnitErrorHandler implements MessageHandler {
private final LogService logService;
@Override
public void handleMessage(Message<?> message) throws MessagingException {
Prop<?> prop = (Prop<?>) message.getPayload();
logService.saveErrorLog(prop);
}
}
```
我使用 MessagingGateway 注释将消息定向到我的 mqttOutboundChannel ，以便我可以使用 MqttGateway 发送 mqtt 消息
```java
@MessagingGateway(defaultRequestChannel = "mqttOutboundChannel")
public interface MqttGateway {
void sendToMqtt(String data);
void sendToTopic(String payload, @Header(MqttHeaders.TOPIC)String topic);
void sendToTopic(String payload, @Header(MqttHeaders.TOPIC)String topic,@Header(MqttHeaders.QOS ) int qos);
void sendWithResp(String payload, @Header(MqttHeaders.TOPIC)String topic,@Header(MqttHeaders.RESPONSE_TOPIC) String responseTopic,@Header(MqttHeaders.QOS ) int qos);
}
```
当消息投递率很低，一般每秒不到 200 条消息时，我一开始提到的错误就不会出现，但是当我将消息投递率提高到 5000 条时，按照上面的配置就开始出现报错，另外如果我去掉了 mqtt 消息的入站部分，也就是上面的代码中引入 的 statusInboundFlow 集成 Flow 后 发送消息又不报错了 |
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