Apache骆驼错误处理如何与多播和事务一起工作

问题描述

我得到了带有骆驼（3.5.0）应用程序的弹簧靴（2.3.2.RELEASE）和其中的两条测试路径：

该想法是检查从多播调用的子路由中发生异常时发生的情况以及它如何与事务一起工作。

@Component
public class MyRoute1 extends RouteBuilder {

@Override
public void configure() {

    onException(Exception.class)
        .uSEOriginalBody()
        .log("Error handler parent. Body is: ${body}")
        .process(new Processor() {
            @Override
            public void process(Exchange exchange) throws Exception {
                Exception cause = exchange.getProperty(Exchange.EXCEPTION_CAUGHT,Exception.class);
                System.out.println(cause.getMessage());
                cause.printstacktrace(System.out);
            }
        })
        .handled(true);

    from("jms:queue:EventsQueue")
        .routeId("route1")
        .onCompletion().log("On complete parent").end()
        .transacted()
        .multicast(AggregationStrategies.uSEOriginal(),false)
            .to("direct:route2")
            .log("Second step")
        .end()
        .log("Third step");

}
}

和

@Component
public class MyRoute2 extends RouteBuilder {

@Override
public void configure() {

    onException(IOException.class)
        .log("Error handling child");

    from("direct:route2")
        .routeId("route2")
        .onCompletion().log("On complete child").end()
        .log("First step")
        .throwException(new IOException("Very bad exception"));

}

}

当我向jms:queue:EventsQueue发送消息时，我期望交换会失败，并抛出异常并遵循以下自定义日志消息的顺序：

First step
Error handling child
On complete child
On complete parent

不应触发其他日志消息。

但是我有以下行为：java.lang.NullPointerException被多播聚合策略抛出并陷入父onException块中。因此，自定义日志的顺序为：

First step
Error handling child
On complete child
Error handler parent
null
java.lang.NullPointerException
    at org.apache.camel.processor.aggregate.USEOriginalAggregationStrategy.aggregate(USEOriginalAggregationStrategy.java:62)
...
On complete parent

有趣的部分出现在这里：如果我删除了父路由行为更改中的.transacted()方法。聚合策略仍会抛出java.lang.NullPointerException异常，但是它没有被我的父母onException阻止。

带有.transacted()的骆驼原木：

2020-11-03 14:38:35.800  INFO 11744 --- [           main] a.test.errors.MySpringBootApplication    : Started MySpringBootApplication in 3.44 seconds (JVM running for 3.916)
2020-11-03 14:38:46.389  INFO 11744 --- [[EventsPsQueue]] route2                                   : First step
2020-11-03 14:38:46.394  INFO 11744 --- [[EventsPsQueue]] route2                                   : Error handling child
2020-11-03 14:38:46.398 ERROR 11744 --- [[EventsPsQueue]] o.a.c.p.e.DefaultErrorHandler            : Failed delivery for (MessageId: queue_EventsPsQueue_ID_wsc-111-71a-44245-1603872340334-4_9_1_1_3 on ExchangeId: ID-wsc-111-71a-1604403526383-0-2). Exhausted after delivery attempt: 1 caught: java.io.IOException: Very bad exception. Processed by failure processor: FatalFallbackerrorHandler[Channel[log5]]

Message History (complete message history is disabled)
---------------------------------------------------------------------------------------------------------------------------------------
RouteId              ProcessorId          Processor                                                                        Elapsed (ms)
[route1            ] [route1            ] [from[jms://queue:EventsPsQueue]                                               ] [        25]

Stacktrace
---------------------------------------------------------------------------------------------------------------------------------------


java.io.IOException: Very bad exception
    at activemq.test.errors.chapter1.MyRoute2.configure(MyRoute2.java:20) ~[classes/:na]
    at org.apache.camel.builder.RouteBuilder.checkInitialized(RouteBuilder.java:483) ~[camel-core-engine-3.5.0.jar:3.5.0]
    at org.apache.camel.builder.RouteBuilder.configureRoutes(RouteBuilder.java:430) ~[camel-core-engine-3.5.0.jar:3.5.0]
    at org.apache.camel.builder.RouteBuilder.addRoutesToCamelContext(RouteBuilder.java:405) ~[camel-core-engine-3.5.0.jar:3.5.0]
    at org.apache.camel.impl.engine.AbstractCamelContext.addRoutes(AbstractCamelContext.java:1185) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.main.RoutesConfigurer.configureRoutes(RoutesConfigurer.java:93) ~[camel-main-3.5.0.jar:3.5.0]
    at org.apache.camel.spring.boot.CamelSpringBootApplicationListener.onApplicationEvent(CamelSpringBootApplicationListener.java:101) ~[camel-spring-boot-3.5.0.jar:3.5.0]
    at org.apache.camel.spring.boot.CamelSpringBootApplicationListener.onApplicationEvent(CamelSpringBootApplicationListener.java:57) ~[camel-spring-boot-3.5.0.jar:3.5.0]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:404) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:361) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:898) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:554) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at activemq.test.errors.MySpringBootApplication.main(MySpringBootApplication.java:13) ~[classes/:na]

2020-11-03 14:38:46.400  WARN 11744 --- [[EventsPsQueue]] o.a.c.s.spi.TransactionErrorHandler      : Transaction rollback (0x347b370c) redelivered(false) for (MessageId: queue_EventsPsQueue_ID_wsc-111-71a-44245-1603872340334-4_9_1_1_3 on ExchangeId: ID-wsc-111-71a-1604403526383-0-2) caught: java.io.IOException: Very bad exception
2020-11-03 14:38:46.401  INFO 11744 --- [[EventsPsQueue]] route2                                   : On completion child
2020-11-03 14:38:46.401  INFO 11744 --- [[EventsPsQueue]] route1                                   : Error handler parent. Body is: TEST MESSAGE
null
java.lang.NullPointerException
    at org.apache.camel.processor.aggregate.USEOriginalAggregationStrategy.aggregate(USEOriginalAggregationStrategy.java:62)
    at org.apache.camel.AggregationStrategy.aggregate(AggregationStrategy.java:86)
    at org.apache.camel.processor.MulticastProcessor.doAggregateInternal(MulticastProcessor.java:628)
    at org.apache.camel.processor.MulticastProcessor.doAggregateSync(MulticastProcessor.java:609)
    at org.apache.camel.processor.MulticastProcessor.doAggregate(MulticastProcessor.java:594)
    at org.apache.camel.processor.MulticastProcessor$MulticastTask.aggregate(MulticastProcessor.java:413)
    at org.apache.camel.processor.MulticastProcessor$MulticastTask.lambda$null$0(MulticastProcessor.java:393)
    at org.apache.camel.AsyncCallback.run(AsyncCallback.java:44)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:148)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor.schedule(DefaultReactiveExecutor.java:55)
    at org.apache.camel.processor.CamelInternalProcessor$AsyncAfterTask.done(CamelInternalProcessor.java:186)
    at org.apache.camel.spring.spi.TransactionErrorHandler.process(TransactionErrorHandler.java:129)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:287)
    at org.apache.camel.processor.MulticastProcessor$MulticastTask.lambda$run$1(MulticastProcessor.java:367)
    at org.apache.camel.util.concurrent.AsyncCompletionService$Task.run(AsyncCompletionService.java:150)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:148)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleSync(DefaultReactiveExecutor.java:65)
    at org.apache.camel.processor.MulticastProcessor.process(MulticastProcessor.java:273)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler$RedeliveryTask.doRun(RedeliveryErrorHandler.java:723)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler$RedeliveryTask.run(RedeliveryErrorHandler.java:632)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:148)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleSync(DefaultReactiveExecutor.java:65)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:181)
    at org.apache.camel.impl.engine.DefaultAsyncProcessorAwaitManager.process(DefaultAsyncProcessorAwaitManager.java:83)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:164)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:261)
    at org.apache.camel.processor.Pipeline$PipelineTask.run(Pipeline.java:90)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:148)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleSync(DefaultReactiveExecutor.java:65)
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:145)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler$RedeliveryTask.doRun(RedeliveryErrorHandler.java:723)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler$RedeliveryTask.run(RedeliveryErrorHandler.java:632)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:148)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleSync(DefaultReactiveExecutor.java:65)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:181)
    at org.apache.camel.spring.spi.TransactionErrorHandler.access$201(TransactionErrorHandler.java:45)
    at org.apache.camel.spring.spi.TransactionErrorHandler$2.process(TransactionErrorHandler.java:238)
    at org.apache.camel.impl.engine.DefaultAsyncProcessorAwaitManager.process(DefaultAsyncProcessorAwaitManager.java:83)
    at org.apache.camel.spring.spi.TransactionErrorHandler.processByErrorHandler(TransactionErrorHandler.java:235)
    at org.apache.camel.spring.spi.TransactionErrorHandler.process(TransactionErrorHandler.java:110)
    at org.apache.camel.spring.spi.TransactionErrorHandler.process(TransactionErrorHandler.java:123)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler$RedeliveryTask.doRun(RedeliveryErrorHandler.java:723)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler$RedeliveryTask.run(RedeliveryErrorHandler.java:632)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:148)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleSync(DefaultReactiveExecutor.java:65)
    at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:181)
    at org.apache.camel.spring.spi.TransactionErrorHandler.access$201(TransactionErrorHandler.java:45)
    at org.apache.camel.spring.spi.TransactionErrorHandler$2.process(TransactionErrorHandler.java:238)
    at org.apache.camel.impl.engine.DefaultAsyncProcessorAwaitManager.process(DefaultAsyncProcessorAwaitManager.java:83)
    at org.apache.camel.spring.spi.TransactionErrorHandler.processByErrorHandler(TransactionErrorHandler.java:235)
    at org.apache.camel.spring.spi.TransactionErrorHandler$1.doInTransactionWithoutResult(TransactionErrorHandler.java:198)
    at org.springframework.transaction.support.TransactionCallbackWithoutResult.doInTransaction(TransactionCallbackWithoutResult.java:36)
    at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140)
    at org.apache.camel.spring.spi.TransactionErrorHandler.doInTransactionTemplate(TransactionErrorHandler.java:191)
    at org.apache.camel.spring.spi.TransactionErrorHandler.processInTransaction(TransactionErrorHandler.java:146)
    at org.apache.camel.spring.spi.TransactionErrorHandler.process(TransactionErrorHandler.java:114)
    at org.apache.camel.spring.spi.TransactionErrorHandler.process(TransactionErrorHandler.java:123)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:287)
    at org.apache.camel.processor.Pipeline$PipelineTask.run(Pipeline.java:90)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:148)
    at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleMain(DefaultReactiveExecutor.java:60)
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:147)
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:287)
    at org.apache.camel.impl.engine.DefaultAsyncProcessorAwaitManager.process(DefaultAsyncProcessorAwaitManager.java:83)
    at org.apache.camel.support.AsyncProcessorSupport.process(AsyncProcessorSupport.java:41)
    at org.apache.camel.component.jms.EndpointMessageListener.onMessage(EndpointMessageListener.java:130)
    at org.springframework.jms.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:736)
    at org.springframework.jms.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:696)
    at org.springframework.jms.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessageListenerContainer.java:674)
    at org.springframework.jms.listener.AbstractPollingMessageListenerContainer.doReceiveAndExecute(AbstractPollingMessageListenerContainer.java:318)
    at org.springframework.jms.listener.AbstractPollingMessageListenerContainer.receiveAndExecute(AbstractPollingMessageListenerContainer.java:245)
    at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncmessageListenerInvoker.invokeListener(DefaultMessageListenerContainer.java:1189)
    at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncmessageListenerInvoker.executeOngoingLoop(DefaultMessageListenerContainer.java:1179)
    at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncmessageListenerInvoker.run(DefaultMessageListenerContainer.java:1076)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.lang.Thread.run(Thread.java:834)
2020-11-03 14:38:46.407  INFO 11744 --- [[EventsPsQueue]] route1                                   : On complete parent
2020-11-03 14:38:46.411  WARN 11744 --- [[EventsPsQueue]] c.c.j.DefaultJmsMessageListenerContainer : Setup of JMS message listener invoker Failed for destination 'EventsPsQueue' - trying to recover. Cause: Transaction rolled back because it has been marked as rollback-only

没有交易支持的骆驼日志：

2020-11-03 14:40:27.748  INFO 11981 --- [           main] a.test.errors.MySpringBootApplication    : Started MySpringBootApplication in 3.234 seconds (JVM running for 3.643)
2020-11-03 14:40:36.828  INFO 11981 --- [[EventsPsQueue]] route2                                   : First step
2020-11-03 14:40:36.832  INFO 11981 --- [[EventsPsQueue]] route2                                   : Error handling child
2020-11-03 14:40:36.837 ERROR 11981 --- [[EventsPsQueue]] o.a.c.p.e.DefaultErrorHandler            : Failed delivery for (MessageId: queue_EventsPsQueue_ID_wsc-111-71a-44245-1603872340334-4_9_1_1_4 on ExchangeId: ID-wsc-111-71a-1604403636824-0-2). Exhausted after delivery attempt: 1 caught: java.io.IOException: Very bad exception. Processed by failure processor: FatalFallbackerrorHandler[Channel[log5]]

Message History (complete message history is disabled)
---------------------------------------------------------------------------------------------------------------------------------------
RouteId              ProcessorId          Processor                                                                        Elapsed (ms)
[route1            ] [route1            ] [from[jms://queue:EventsPsQueue]                                               ] [        24]

Stacktrace
---------------------------------------------------------------------------------------------------------------------------------------


java.io.IOException: Very bad exception
    at activemq.test.errors.chapter1.MyRoute2.configure(MyRoute2.java:20) ~[classes/:na]
    at org.apache.camel.builder.RouteBuilder.checkInitialized(RouteBuilder.java:483) ~[camel-core-engine-3.5.0.jar:3.5.0]
    at org.apache.camel.builder.RouteBuilder.configureRoutes(RouteBuilder.java:430) ~[camel-core-engine-3.5.0.jar:3.5.0]
    at org.apache.camel.builder.RouteBuilder.addRoutesToCamelContext(RouteBuilder.java:405) ~[camel-core-engine-3.5.0.jar:3.5.0]
    at org.apache.camel.impl.engine.AbstractCamelContext.addRoutes(AbstractCamelContext.java:1185) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.main.RoutesConfigurer.configureRoutes(RoutesConfigurer.java:93) ~[camel-main-3.5.0.jar:3.5.0]
    at org.apache.camel.spring.boot.CamelSpringBootApplicationListener.onApplicationEvent(CamelSpringBootApplicationListener.java:101) ~[camel-spring-boot-3.5.0.jar:3.5.0]
    at org.apache.camel.spring.boot.CamelSpringBootApplicationListener.onApplicationEvent(CamelSpringBootApplicationListener.java:57) ~[camel-spring-boot-3.5.0.jar:3.5.0]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:404) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:361) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:898) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:554) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.3.2.RELEASE.jar:2.3.2.RELEASE]
    at activemq.test.errors.MySpringBootApplication.main(MySpringBootApplication.java:13) ~[classes/:na]

2020-11-03 14:40:36.838  INFO 11981 --- [[EventsPsQueue]] route2                                   : On completion child
2020-11-03 14:40:36.839  INFO 11981 --- [[EventsPsQueue]] route1                                   : On complete parent
2020-11-03 14:40:36.848  WARN 11981 --- [[EventsPsQueue]] o.a.c.c.jms.EndpointMessageListener      : Execution of JMS message listener Failed. Caused by: [org.apache.camel.RuntimeCamelException - java.lang.NullPointerException]

org.apache.camel.RuntimeCamelException: java.lang.NullPointerException
    at org.apache.camel.RuntimeCamelException.wrapRuntimeCamelException(RuntimeCamelException.java:51) ~[camel-api-3.5.0.jar:3.5.0]
    at org.apache.camel.component.jms.EndpointMessageListener$EndpointMessageListenerAsyncCallback.done(EndpointMessageListener.java:213) ~[camel-jms-3.5.0.jar:3.5.0]
    at org.apache.camel.component.jms.EndpointMessageListener.onMessage(EndpointMessageListener.java:134) ~[camel-jms-3.5.0.jar:3.5.0]
    at org.springframework.jms.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:736) ~[spring-jms-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.jms.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:696) ~[spring-jms-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.jms.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessageListenerContainer.java:674) ~[spring-jms-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.jms.listener.AbstractPollingMessageListenerContainer.doReceiveAndExecute(AbstractPollingMessageListenerContainer.java:318) ~[spring-jms-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.jms.listener.AbstractPollingMessageListenerContainer.receiveAndExecute(AbstractPollingMessageListenerContainer.java:245) ~[spring-jms-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncmessageListenerInvoker.invokeListener(DefaultMessageListenerContainer.java:1189) ~[spring-jms-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncmessageListenerInvoker.executeOngoingLoop(DefaultMessageListenerContainer.java:1179) ~[spring-jms-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncmessageListenerInvoker.run(DefaultMessageListenerContainer.java:1076) ~[spring-jms-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]
    at java.base/java.lang.Thread.run(Thread.java:834) ~[na:na]
Caused by: java.lang.NullPointerException: null
    at org.apache.camel.processor.aggregate.USEOriginalAggregationStrategy.aggregate(USEOriginalAggregationStrategy.java:62) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.AggregationStrategy.aggregate(AggregationStrategy.java:86) ~[camel-api-3.5.0.jar:3.5.0]
    at org.apache.camel.processor.MulticastProcessor.doAggregateInternal(MulticastProcessor.java:628) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.processor.MulticastProcessor.doAggregateSync(MulticastProcessor.java:609) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.processor.MulticastProcessor.doAggregate(MulticastProcessor.java:594) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.processor.MulticastProcessor$MulticastTask.aggregate(MulticastProcessor.java:413) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.processor.MulticastProcessor$MulticastTask.lambda$null$0(MulticastProcessor.java:393) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.AsyncCallback.run(AsyncCallback.java:44) ~[camel-api-3.5.0.jar:3.5.0]
    at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:148) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleMain(DefaultReactiveExecutor.java:60) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.processor.Pipeline.process(Pipeline.java:147) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:287) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.impl.engine.DefaultAsyncProcessorAwaitManager.process(DefaultAsyncProcessorAwaitManager.java:83) ~[camel-base-3.5.0.jar:3.5.0]
    at org.apache.camel.support.AsyncProcessorSupport.process(AsyncProcessorSupport.java:41) ~[camel-support-3.5.0.jar:3.5.0]
    at org.apache.camel.component.jms.EndpointMessageListener.onMessage(EndpointMessageListener.java:130) ~[camel-jms-3.5.0.jar:3.5.0]
    ... 11 common frames omitted

问题是：

如果子路由中发生其他异常，为什么在多播期间有java.lang.NullPointerException。
为什么在没有事务支持的情况下我会有不同的错误处理行为。

如果有任何帮助或建议，我将很高兴！

解决方法

对于onException，您还可以将其他两项设置为 true 或 false > handled 和 continued 。我认为这些可以向您解释异常如何传播到父路由。

如果handlered为true，则将处理抛出的异常，并且Camel将不会继续沿原始路由进行路由，而是会中断

https://camel.apache.org/manual/latest/exception-clause.html#ExceptionClause-WhatistheDifferenceBetweenHandledandContinued

在Camel 2.3中，我们引入了一个新的选项continue，它使您既可以处理也可以在原始路由中继续路由，就好像没有发生异常一样。

https://camel.apache.org/manual/latest/exception-clause.html#ExceptionClause-HandleandContinueExceptions

关于那个transacted()，我不知道。我正在阅读有关它的信息，如果我找到答案，将会把您链接到该页面。

这是预期的行为。

让我先引用 Camel 的官方文档。

非事务性和事务性错误处理之间的区别。

Camel 中的错误处理大致可以分为两种不同的类型：

非交易
事务性

非事务性是最常见的类型，它是开箱即用的，由 Camel 本身处理。事务类型由后备系统（例如 J2EE 应用服务器）处理。

然后，这就是 Camel 默认处理错误的方式。

在 Camel 2.0 之后，全局 DefaultErrorHandler 默认设置为 Error Handler。它被配置为：

没有重新交付
没有死信队列

如果交换失败，则抛出异常并将其传播回包含在 RuntimeCamelException 中的原始调用方。

最后，这就是多播 EIP 改变这种行为的方式。

默认情况下，多播 EIP 将继续处理整个交换，即使其中一个多播消息在路由期间抛出异常。

当在您的非事务性路由中抛出异常时，只有 DefaultErrorHandler 会记录错误，但路由继续执行，因为我们在多播 EIP 中。路由完成并且没有异常被传播回来。

当在您的事务路由中抛出异常时，TransactionErrorHandler 也会启动并停止路由执行以触发后备系统中的回滚。此时，异常被 Camel 包装并传播回，在那里调用您的 onException 逻辑。

apache-camel error-handling multicast transactions

Apache骆驼错误处理如何与多播和事务一起工作

问题描述

解决方法

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