I'm pretty new to Camel, and I'm a little confused about exception
handling. I'm working on a client/server application whose
communication happens over camel/jms. I'm taking advantage of Camel's
bean invocation support so that the client can invoke remote services
which are exported by the server (similar to rmi, spring remoting,
etc.). Implemented this way, it seems pretty trivial, but one thing
which is not working is propagation of service call exceptions from the
server to the client.
A brief description of the setup:
// the service interface common to both client and server
interface LoginService {
public String login(String username, String password) throws
LoginException;
}
on the server:
LoginService loginService = new LoginServiceImpl();
...
// server routes
from("activemq:queue:loginService")
.bean(loginService);
on the client:
// client routes
from("direct:loginService")
.to("activemq:queue:loginService")
...
// elsewhere, I construct the remote service proxy
Endpoint endpoint = context.getEndpoint("direct:loginService");
LoginService loginService = ProxyHelper.createProxy(endpoint,
LoginService.class);
This setup works as desired in the case where LoginService.login()
completes normally. However, in the case where LoginService.login()
throws an exception, an error is logged on the server (see below), and
the client gets no response (the client times out after receiving no
response for 20s). I haven't configured any exception handler, so it's
using the default exception handler, which is supposed to "propagate the
exception to the caller". Well, I don't really understand what
"propagate the exception to the caller" is supposed to mean in the
context of camel, but it sure isn't propagating the call back to the
remote invoker. Is there some specific error handler recipe that I need
to use here? I'm using Camel 2.3.0.
Thanks,
Jim
2010-08-03 15:59:21,147 [DefaultMessageListenerContainer-1] INFO route2
- Received login request:
2010-08-03 15:59:21,163 [DefaultMessageListenerContainer-1] ERROR
org.apache.camel.processor.DefaultErrorHandler - Failed delivery for
exchangeId: ID:rsi-eng-newsham-54650-1280887160851-0:0:2:1:1. Exhausted
after delivery attempt: 1 caught:
org.apache.camel.RuntimeCamelException:
javax.security.auth.login.LoginException: invalid username or password
org.apache.camel.RuntimeCamelException:
javax.security.auth.login.LoginException: invalid username or password
at
org.apache.camel.util.ObjectHelper.wrapRuntimeCamelException(ObjectHelper.java:1111)
at
org.apache.camel.component.bean.BeanInvocation.invoke(BeanInvocation.java:92)
at
org.apache.camel.component.bean.BeanProcessor.process(BeanProcessor.java:105)
at
org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:67)
at
org.apache.camel.processor.DelegateProcessor.processNext(DelegateProcessor.java:53)
at
org.apache.camel.processor.DelegateProcessor.proceed(DelegateProcessor.java:82)
at
org.apache.camel.processor.interceptor.TraceInterceptor.process(TraceInterceptor.java:97)
at
org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:67)
at
org.apache.camel.processor.RedeliveryErrorHandler.processExchange(RedeliveryErrorHandler.java:185)
at
org.apache.camel.processor.RedeliveryErrorHandler.processErrorHandler(RedeliveryErrorHandler.java:151)
at
org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:89)
at
org.apache.camel.processor.DefaultErrorHandler.process(DefaultErrorHandler.java:49)
at
org.apache.camel.processor.DefaultChannel.process(DefaultChannel.java:228)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:75)
at
org.apache.camel.processor.UnitOfWorkProcessor.processNext(UnitOfWorkProcessor.java:70)
at
org.apache.camel.processor.DelegateProcessor.process(DelegateProcessor.java:48)
at
org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:67)
at
org.apache.camel.component.jms.EndpointMessageListener.onMessage(EndpointMessageListener.java:84)
at
org.springframework.jms.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:543)
at
org.springframework.jms.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:482)
at
org.springframework.jms.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessageListenerContainer.java:451)
at
org.springframework.jms.listener.AbstractPollingMessageListenerContainer.doReceiveAndExecute(AbstractPollingMessageListenerContainer.java:323)
at
org.springframework.jms.listener.AbstractPollingMessageListenerContainer.receiveAndExecute(AbstractPollingMessageListenerContainer.java:261)
at
org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.invokeListener(DefaultMessageListenerContainer.java:982)
at
org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.executeOngoingLoop(DefaultMessageListenerContainer.java:974)
at
org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.run(DefaultMessageListenerContainer.java:876)
at java.lang.Thread.run(Thread.java:619)
Caused by: javax.security.auth.login.LoginException: invalid username or
password
at
com.referentia.sdf.csproto.node.components.ClientGatewayComponent$LoginServiceImpl.login(ClientGatewayComponent.java:205)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
com.referentia.commons.lang.reflect.RetargettableProxy$Handler.invoke(RetargettableProxy.java:236)
at $Proxy12.login(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.apache.camel.component.bean.BeanInvocation.invoke(BeanInvocation.java:86)
... 25 more
2010-08-03 15:59:21,164 [DefaultMessageListenerContainer-1] ERROR
org.apache.camel.component.jms.EndpointMessageListener - Caused by:
[org.apache.camel.RuntimeCamelException -
javax.security.auth.login.LoginException: invalid username or password]
org.apache.camel.RuntimeCamelException:
javax.security.auth.login.LoginException: invalid username or password
at
org.apache.camel.util.ObjectHelper.wrapRuntimeCamelException(ObjectHelper.java:1111)
at
org.apache.camel.component.bean.BeanInvocation.invoke(BeanInvocation.java:92)
at
org.apache.camel.component.bean.BeanProcessor.process(BeanProcessor.java:105)
at
org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:67)
at
org.apache.camel.processor.DelegateProcessor.processNext(DelegateProcessor.java:53)
at
org.apache.camel.processor.DelegateProcessor.proceed(DelegateProcessor.java:82)
at
org.apache.camel.processor.interceptor.TraceInterceptor.process(TraceInterceptor.java:97)
at
org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:67)
at
org.apache.camel.processor.RedeliveryErrorHandler.processExchange(RedeliveryErrorHandler.java:185)
at
org.apache.camel.processor.RedeliveryErrorHandler.processErrorHandler(RedeliveryErrorHandler.java:151)
at
org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:89)
at
org.apache.camel.processor.DefaultErrorHandler.process(DefaultErrorHandler.java:49)
at
org.apache.camel.processor.DefaultChannel.process(DefaultChannel.java:228)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:75)
at
org.apache.camel.processor.UnitOfWorkProcessor.processNext(UnitOfWorkProcessor.java:70)
at
org.apache.camel.processor.DelegateProcessor.process(DelegateProcessor.java:48)
at
org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:67)
at
org.apache.camel.component.jms.EndpointMessageListener.onMessage(EndpointMessageListener.java:84)
at
org.springframework.jms.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:543)
at
org.springframework.jms.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:482)
at
org.springframework.jms.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessageListenerContainer.java:451)
at
org.springframework.jms.listener.AbstractPollingMessageListenerContainer.doReceiveAndExecute(AbstractPollingMessageListenerContainer.java:323)
at
org.springframework.jms.listener.AbstractPollingMessageListenerContainer.receiveAndExecute(AbstractPollingMessageListenerContainer.java:261)
at
org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.invokeListener(DefaultMessageListenerContainer.java:982)
at
org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.executeOngoingLoop(DefaultMessageListenerContainer.java:974)
at
org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.run(DefaultMessageListenerContainer.java:876)
at java.lang.Thread.run(Thread.java:619)
Caused by: javax.security.auth.login.LoginException: invalid username or
password
at
com.referentia.sdf.csproto.node.components.ClientGatewayComponent$LoginServiceImpl.login(ClientGatewayComponent.java:205)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
com.referentia.commons.lang.reflect.RetargettableProxy$Handler.invoke(RetargettableProxy.java:236)
at $Proxy12.login(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.apache.camel.component.bean.BeanInvocation.invoke(BeanInvocation.java:86)
... 25 more
2010-08-03 15:59:21,218 [DefaultMessageListenerContainer-1] WARN
org.springframework.jms.listener.DefaultMessageListenerContainer -
Execution of JMS message listener failed
org.apache.camel.RuntimeCamelException:
javax.security.auth.login.LoginException: invalid username or password
at
org.apache.camel.util.ObjectHelper.wrapRuntimeCamelException(ObjectHelper.java:1111)
at
org.apache.camel.component.bean.BeanInvocation.invoke(BeanInvocation.java:92)
at
org.apache.camel.component.bean.BeanProcessor.process(BeanProcessor.java:105)
at
org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:67)
at
org.apache.camel.processor.DelegateProcessor.processNext(DelegateProcessor.java:53)
at
org.apache.camel.processor.DelegateProcessor.proceed(DelegateProcessor.java:82)
at
org.apache.camel.processor.interceptor.TraceInterceptor.process(TraceInterceptor.java:97)
at
org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:67)
at
org.apache.camel.processor.RedeliveryErrorHandler.processExchange(RedeliveryErrorHandler.java:185)
at
org.apache.camel.processor.RedeliveryErrorHandler.processErrorHandler(RedeliveryErrorHandler.java:151)
at
org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:89)
at
org.apache.camel.processor.DefaultErrorHandler.process(DefaultErrorHandler.java:49)
at
org.apache.camel.processor.DefaultChannel.process(DefaultChannel.java:228)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:75)
at
org.apache.camel.processor.UnitOfWorkProcessor.processNext(UnitOfWorkProcessor.java:70)
at
org.apache.camel.processor.DelegateProcessor.process(DelegateProcessor.java:48)
at
org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:67)
at
org.apache.camel.component.jms.EndpointMessageListener.onMessage(EndpointMessageListener.java:84)
at
org.springframework.jms.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:543)
at
org.springframework.jms.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:482)
at
org.springframework.jms.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessageListenerContainer.java:451)
at
org.springframework.jms.listener.AbstractPollingMessageListenerContainer.doReceiveAndExecute(AbstractPollingMessageListenerContainer.java:323)
at
org.springframework.jms.listener.AbstractPollingMessageListenerContainer.receiveAndExecute(AbstractPollingMessageListenerContainer.java:261)
at
org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.invokeListener(DefaultMessageListenerContainer.java:982)
at
org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.executeOngoingLoop(DefaultMessageListenerContainer.java:974)
at
org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.run(DefaultMessageListenerContainer.java:876)
at java.lang.Thread.run(Thread.java:619)
Caused by: javax.security.auth.login.LoginException: invalid username or
password
at
com.referentia.sdf.csproto.node.components.ClientGatewayComponent$LoginServiceImpl.login(ClientGatewayComponent.java:205)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
com.referentia.commons.lang.reflect.RetargettableProxy$Handler.invoke(RetargettableProxy.java:236)
at $Proxy12.login(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
org.apache.camel.component.bean.BeanInvocation.invoke(BeanInvocation.java:86)
... 25 more
