Camel Direct 端点异常

Question

我有一个简单的问题。我无法从文件端点读取到直接端点。下面是代码片段：

public class SampleTwo {


public static void main(String[] args) throws Exception {
    final CamelContext camelContext = new DefaultCamelContext();
    camelContext.start();
    camelContext.addRoutes(new RouteBuilder() {

        @Override
        public void configure() throws Exception {          
            from("file://target/inbox?noop=true&fileName=test.csv").to("direct://start"); //Fails with "No consumers available on endpoint" exception
            //from("file://target/inbox?noop=true&fileName=test.csv").to("file://target/outbox"); //Works

        }
    });

    Thread.sleep(1000*6000);

    // stop the CamelContext
  //  camelContext.stop();
}}

我遇到异常 "No consumers available on endpoint"。这是一个简单的路由 & 我已经做了我能做的一切 - 现在花了 10 多个小时:(

请帮助...跟踪堆栈跟踪（启用跟踪）

[hread #0 - file://target/inbox] EventHelper
TRACE Notifier: org.apache.camel.impl.DefaultRuntimeEndpointRegistry@99e74a is not enabled for the event: ID-01HW466539-57567-1431438054047-0-41 exchange failure: Exchange[test.csv] 
cause 
org.apache.camel.component.direct.DirectConsumerNotAvailableException: No consumers available on endpoint: Endpoint[direct://start]. Exchange[test.csv]
[hread #0 - file://target/inbox] FileConsumer                   
TRACE Done processing file: GenericFile[test.csv] synchronously
[hread #0 - file://target/inbox] DefaultErrorHandler            
ERROR Failed delivery for (MessageId: ID-01HW466539-57567-1431438054047-0-42 on ExchangeId: ID-01HW466539-57567-1431438054047-0-41). Exhausted after delivery attempt: 
1 caught:
org.apache.camel.component.direct.DirectConsumerNotAvailableException: No consumers available on endpoint: Endpoint[direct://start]. Exchange[test.csv]

消息历史记录

--------------------------------------------------------------------------------------------------------------------------------------
RouteId              ProcessorId          Processor                                                              Elapsed (ms)
[route1            ] [route1            ] [file://target/inbox?fileName=test.csv&noop=true                               ] [         3]
[route1            ] [to1               ] [direct://start                                                                ] [         0]

交换

---------------------------------------------------------------------------------------------------------------------------------------
Exchange[
Id                  ID-01HW466539-57567-1431438054047-0-41
ExchangePattern     InOnly
Headers             {breadcrumbId=ID-01HW466539-57567-1431438054047-0-42, CamelFileAbsolute=false, CamelFileAbsolutePath=C:\folder\eclipse-ws-march\camelsampletwo\target\inbox\test.csv, CamelFileContentType=null, CamelFileLastModified=1431426831841, CamelFileLength=45, CamelFileName=test.csv, CamelFileNameConsumed=test.csv, CamelFileNameOnly=test.csv, CamelFileParent=target\inbox, CamelFilePath=target\inbox\test.csv, CamelFileRelativePath=test.csv, CamelRedelivered=false, CamelRedeliveryCounter=0}
BodyType            org.apache.camel.component.file.GenericFile
Body                [Body is file based: GenericFile[test.csv]]]

堆栈跟踪

---------------------------------------------------------------------------------------------------------------------------------------
org.apache.camel.component.direct.DirectConsumerNotAvailableException: No consumers available on endpoint: Endpoint[direct://start]. Exchange[test.csv]

Answer 1

默认情况下，direct 组件期望每个生产者都有一个匹配的消费者。请注意 Camel Documentation 中显示的新配置选项 failIfNoConsumers。没有消费者，交换就无处可去。您可以考虑像这样添加另一条路线：

public class SampleTwo {


public static void main(String[] args) throws Exception {
    final CamelContext camelContext = new DefaultCamelContext();
    camelContext.start();
    camelContext.addRoutes(new RouteBuilder() {

        @Override
        public void configure() throws Exception {          
            from("file://target/inbox?noop=true&fileName=test.csv").to("direct://start"); 
            from("direct://start").to("file://target/outbox");  //ADDED

        }
    });

    Thread.sleep(1000*6000);
}}

Answer 2

这个例外

org.apache.camel.component.direct.DirectConsumerNotAvailableException: No consumers available on endpoint: Endpoint[direct://XXXXX

当您忘记启动 Camel 上下文并创建 Producer/Consumer 模板时也会抛出，就像我一样....

我花了半天时间才弄明白:-(,所以别忘了

context.start()

Answer 3

为什么要直接传递给它？如果您没有直接的消费者？我可以知道用例吗？

您甚至可以在 from endpoint 之后添加一个日志端点并终止路由。

Answer 4

如果你有多个 camelContext 并且你没有提到正确的 camelContext id 那么你也会得到这个异常。

Camel Direct 端点异常

Camel Direct end-point exception

java

apache-camel