示例路线：
onException(Exception.class)
.process(new Processor() {
@Override
public void process(Exchange exchange) throws Exception {
System.out.println("it works");
}
})
.handled(true);
from("jetty://http://0.0.0.0:8888/test")
.idempotentConsumer(header("myid"), MemoryIdempotentRepository.memoryIdempotentRepository(1000000))
.skipDuplicate(false)
.filter(property(Exchange.DUPLICATE_MESSAGE).isEqualTo(true))
.throwException(new DuplicateRequestException())
.end();
在没有 myid 参数的情况下向侦听器 URL 发送请求会引发 org.apache.camel.processor.idempotent.NoMessageIdException: No message ID could be found using expression: header(myid) on message exchange: Exchange[Message: [Body is instance of org .apache.camel.StreamCache]]
没有从 onException 传递。