我正在寻找一种解决方案，以在使用 Apache Camel - JMS Remoting 时使消费者端抛出的异常返回到生产者端。
我发现 Apache Camel JMS 已经有一个类似的问题- Exceptions not returned to caller with request/reply。
所以，我按照那里的答案，我按照克劳斯的建议打开了 transferException 选项，但 Camel 仍然给我一个错误 - 另一个错误，InvalidPayloadException 这是由 org.apache.camel.NoTypeConversionAvailableException 引起的 - 没有可用于从类型转换的类型转换器: org.apache.camel.RuntimeCamelException 到所需类型：long with value org.apache.camel.RuntimeCamelException: com.xyzServiceException: test]。
因此，似乎我确实按照克劳斯的建议将异常转移到了生产者端（原始异常包含在 RuntimeCalmelException 中）。问题是骆驼试图将我的异常转换为长的返回类型。
有没有办法让异常一直冒泡而不被转换？
这是详细信息：
接口：PricingService.java
public long getPrice(String id);
消费者端：PricingServiceImpl.java
@Service("pricingService")
public class PricingServiceImpl {
public long getPrice(String id) {
//only throw an exception here for simplicity.
//Assuming ServiceException is serializable.
throw new ServiceException("test");
}
}
路线构建器：
public class MyRoutes extends RouteBuilder {
public void configure() throws Exception {
getContext().setTracing(true);
from("jms:queue:pricingService concurrentConsumers=25&transferException=true&transferExchange=true").to("pricingService");
}
}
生产方：
<camel:camelContext id="producer">
<camel:proxy id="pricingService"
serviceInterface="com.x.y.z.PricingService"
serviceUrl="jms:queue:pricingService?transferExchange=true"/>
</camel:camelContext>
所以，在生产者方面，当我打电话时pricingService.getPrice("abc")，我得到了一个例外，如下所示：
org.apache.camel.InvalidPayloadException: No body available of type: long but has value: org.apache.camel.RuntimeCamelException: com.x.y.z.ServiceException: ERR_NOT_FOUND of type: org.apache.camel.RuntimeCamelException on: JmsMessage[JmsMessageID: ID:localhost.localdomain-35812-1368034706262-11:1:1:1:1]. Caused by: No type converter available to convert from type: org.apache.camel.RuntimeCamelException to the required type: long with value org.apache.camel.RuntimeCamelException: com.x.y.z.ServiceException: ERR_NOT_FOUND. Exchange[JmsMessage[JmsMessageID: ID:localhost.localdomain-35812-1368034706262-11:1:1:1:1]]. Caused by: [org.apache.camel.NoTypeConversionAvailableException - No type converter available to convert from type: org.apache.camel.RuntimeCamelException to the required type: long with value org.apache.camel.RuntimeCamelException: com.x.y.z.ServiceException: ERR_NOT_FOUND]
at org.apache.camel.impl.MessageSupport.getMandatoryBody(MessageSupport.java:101)
at org.apache.camel.component.bean.AbstractCamelInvocationHandler.getBody(AbstractCamelInvocationHandler.java:66)
at org.apache.camel.component.bean.AbstractCamelInvocationHandler.afterInvoke(AbstractCamelInvocationHandler.java:175)
at org.apache.camel.component.bean.AbstractCamelInvocationHandler$1.call(AbstractCamelInvocationHandler.java:112)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at org.apache.camel.component.bean.AbstractCamelInvocationHandler.invokeWithBody(AbstractCamelInvocationHandler.java:128)
at org.apache.camel.component.bean.CamelInvocationHandler.doInvokeProxy(CamelInvocationHandler.java:45)
at org.apache.camel.component.bean.AbstractCamelInvocationHandler.invoke(AbstractCamelInvocationHandler.java:82)
... 103 more
Caused by: org.apache.camel.NoTypeConversionAvailableException: No type converter available to convert from type: org.apache.camel.RuntimeCamelException to the required type: long with value org.apache.camel.RuntimeCamelException: com.x.y.z.ServiceException: ERR_NOT_FOUND
at org.apache.camel.impl.converter.BaseTypeConverterRegistry.mandatoryConvertTo(BaseTypeConverterRegistry.java:169)
at org.apache.camel.impl.MessageSupport.getMandatoryBody(MessageSupport.java:99)
... 111 more
谢谢！
更新：
在生产者端添加 transferException 后，我得到的异常更改为以下内容。我真的无法理解这一点。它仍然试图进行转换...请帮助。谢谢。
Caused by: org.apache.camel.InvalidPayloadException: No body available of type: long but has value: BeanInvocation public abstract long com.x.y.z.PricingService.getPrice(java.lang.String) throws com.x.y.z.ServiceException with [test]] of type: org.apache.camel.component.bean.BeanInvocation on: Message: test. Caused by: Error during type conversion from type: org.apache.camel.component.bean.BeanInvocation to the required type: long with value BeanInvocation public abstract long com.x.y.z.service.billing.PricingService.getPrice(java.lang.String) throws com.x.y.z.ServiceException with [test]] due java.lang.NumberFormatException: For input string: "test". Exchange[Message: test]. Caused by: [org.apache.camel.TypeConversionException - Error during type conversion from type: org.apache.camel.component.bean.BeanInvocation to the required type: long with value BeanInvocation public abstract long com.x.y.z.PricingService.getPrice(java.lang.String) throws com.x.y.z.ServiceException with [test]] due java.lang.NumberFormatException: For input string: "test"]
at org.apache.camel.impl.MessageSupport.getMandatoryBody(MessageSupport.java:101)
at org.apache.camel.component.bean.AbstractCamelInvocationHandler.getBody(AbstractCamelInvocationHandler.java:72)
at org.apache.camel.component.bean.AbstractCamelInvocationHandler.afterInvoke(AbstractCamelInvocationHandler.java:175)
at org.apache.camel.component.bean.AbstractCamelInvocationHandler$1.call(AbstractCamelInvocationHandler.java:112)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at org.apache.camel.component.bean.AbstractCamelInvocationHandler.invokeWithBody(AbstractCamelInvocationHandler.java:128)
at org.apache.camel.component.bean.CamelInvocationHandler.doInvokeProxy(CamelInvocationHandler.java:45)
at org.apache.camel.component.bean.AbstractCamelInvocationHandler.invoke(AbstractCamelInvocationHandler.java:82)
... 104 more
Caused by: org.apache.camel.TypeConversionException: Error during type conversion from type: org.apache.camel.component.bean.BeanInvocation to the required type: long with value BeanInvocation public abstract long com.x.y.z.PricingService.getPrice(java.lang.String) throws com.x.y.z.ServiceException with [test]] due java.lang.NumberFormatException: For input string: "test"
at org.apache.camel.impl.converter.BaseTypeConverterRegistry.mandatoryConvertTo(BaseTypeConverterRegistry.java:162)
at org.apache.camel.impl.MessageSupport.getMandatoryBody(MessageSupport.java:99)
... 112 more
Caused by: org.apache.camel.RuntimeCamelException: java.lang.NumberFormatException: For input string: "test"
at org.apache.camel.util.ObjectHelper.wrapRuntimeCamelException(ObjectHelper.java:1316)
at org.apache.camel.util.ObjectHelper.invokeMethod(ObjectHelper.java:962)
at org.apache.camel.impl.converter.StaticMethodTypeConverter.convertTo(StaticMethodTypeConverter.java:47)
at org.apache.camel.component.bean.BeanConverter.convertTo(BeanConverter.java:57)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)