org.apache.camel.CamelExchangeException的AggregationStrategy：无效的关联密钥

如何解决org.apache.camel.CamelExchangeException的AggregationStrategy：无效的关联密钥

我想汇总3个主题，但仅针对汇总策略的PoC，我尝试汇总2个主题。

因此，我已经配置了以下骆驼路线：

@Override
public void configure() throws Exception {
CamelContext contexto = new DefaultCamelContext();
try{
    onException(SQLException.class,Exception.class)
            .handled(true)
            .maximumRedeliveries(1)
            .process(new CustomExceptionProcess());

    errorHandler(deadLetterChannel("file:data/error") // There is no file created 
            .maximumRedeliveries(3)
            .redeliveryDelay(5000));

    from("kafka:topic1") 
            .process(new ProcessTopic1()) // inside this process 
            .to("direct:agregador");

    from("kafka:topic2") 
            .process(new ProcessTopic2())
            .to("direct:agregador");

    from("direct:agregador")
            .aggregate(header("idAgregador"),new EstrategiaAgregador()) // implements AggregationStrategy
            .completionPredicate(predicadoTamanhoMinimo()) // This just to check if is there at least 2 objects before realease the aggregation.
            .eagerCheckCompletion()
            .to("direct:insereBanco")
            ;

    from("direct:insereBanco")
            .process(new ProcessoInsere());

}catch (Exception e){
    LOG.error("Error in the route: ",e);
}

topic1和topic2的过程就是这样：

// It's the same process for ProcessTopic1 and ProcessTopic2
@Override
public void process(Exchange exchange) throws Exception {

    if(!(exchange.getIn().getBody() instanceof Object1)){

        String someData = (String) exchange.getIn().getBody();

        JSONParser parser = new JSONParser();
        Object objeto = parser.parse(someData);
        JSONObject json = (JSONObject) objeto;

        ObjectMapper mapeadorObj = new ObjectMapper();
        Object1 someEntity = mapeadorObj.readValue(json.toString(),Object1.class);

        ProducerTemplate producerTemplate = exchange.getContext().createProducerTemplate();
        producerTemplate.sendBodyAndHeader("direct:agregador",someEntity,"idAgregador",someEntity.getId());
    }
}

但是，当我收到第一条消息进行汇总时，消息离开（因为必须等待第二条消息），但是很快此消息退出，我遇到了以下异常：

org.apache.camel.CamelExchangeException: Invalid correlation key. Exchange[ID-XXXX-1597437627634-0-1]
    at org.apache.camel.processor.aggregate.AggregateProcessor.doProcess(AggregateProcessor.java:302)
    at org.apache.camel.processor.aggregate.AggregateProcessor.process(AggregateProcessor.java:271)
    at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:76)
    at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:548)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:201)
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:138)
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:101)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:201)
    at org.apache.camel.component.direct.DirectProducer.process(DirectProducer.java:76)
>>  at org.apache.camel.processor.SendProcessor.process(SendProcessor.java:148)
    at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:76)
    at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:548)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:201)
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:138)
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:101)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:201)
    at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:97)
>>  at org.apache.camel.component.kafka.KafkaConsumer$KafkaFetchRecords.doRun(KafkaConsumer.java:326)
    at org.apache.camel.component.kafka.KafkaConsumer$KafkaFetchRecords.run(KafkaConsumer.java:215)

一件事是我也在使用Kafka主题发送消息，并且由于它出现在堆栈跟踪中，因此我不确定是否也需要为Kafka设置一些东西。

解决方法

在您的路线中，您已经在执行.to("direct:agregador")。为什么要使用生产者模板将其发送到处理器中？

似乎正在发生的事情是，处理器正在交换中成功向聚合器发送someEntity，但是当控制权返回到路由时，因为您尚未将交换主体设置为{{1 }}，交换仍然保留没有someEntity头的原始消息。

您可以在处理器中执行的操作是删除生产者模板代码并添加：

idAgregador