Dear list, I am getting weird non-deterministic behaviour when constructing a simple Camel context. The real thing is in a complex enterprise application, but I managed to strip it down to a really simple and self-contained test case (self-contained maven project at https://github.com/alexkrauss/camel-spring-issue).
In essence, I have a RouteBuilder instance defining two trivial routes, and a processor, which consumes messages from one route and feeds it into the other (via ProducerTemplate). What I observe is that sometimes (roughly 5-20% of the cases, without changing anything), the camel context initialization fails with the exception pasted below. When comparing the DEBUG logs, it seems that there is a subtle dependency on the bean creation order, which seems to be nondeterministic. Can anybody give helpful insight on why this is happening and how to avoid it? Thanks Alex java.lang.IllegalStateException: Failed to load ApplicationContext at org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContext(CacheAwareContextLoaderDelegate.java:99) at org.springframework.test.context.TestContext.getApplicationContext(TestContext.java:122) at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:109) at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:75) at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:321) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:211) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:288) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:284) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:231) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:88) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71) at org.junit.runners.ParentRunner.run(ParentRunner.java:309) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:174) at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252) at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141) at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189) at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165) at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85) at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115) at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75) Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'route': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.myexample.camelissue.MyProcessor org.myexample.camelissue.MyRoute.myProcessor; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processor' defined in class org.myexample.camelissue.ContextStartupTest$Context: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'camelContext' defined in class org.myexample.camelissue.ContextStartupTest$Context: Invocation of init method failed; nested exception is org.apache.camel.FailedToCreateRouteException: Failed to create route route1 at: >>> process[null] <<< in route: Route(route1)[[From[direct:foo]] -> [process[null]]] because of ref must be specified on: process[null] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1147) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:293) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:290) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:191) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:633) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479) at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:120) at org.springframework.test.context.support.AbstractGenericContextLoader.loadContext(AbstractGenericContextLoader.java:60) at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.delegateLoading(AbstractDelegatingSmartContextLoader.java:100) at org.springframework.test.context.support.AbstractDelegatingSmartContextLoader.loadContext(AbstractDelegatingSmartContextLoader.java:248) at org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContextInternal(CacheAwareContextLoaderDelegate.java:64) at org.springframework.test.context.CacheAwareContextLoaderDelegate.loadContext(CacheAwareContextLoaderDelegate.java:91) ... 31 more Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: private org.myexample.camelissue.MyProcessor org.myexample.camelissue.MyRoute.myProcessor; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processor' defined in class org.myexample.camelissue.ContextStartupTest$Context: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'camelContext' defined in class org.myexample.camelissue.ContextStartupTest$Context: Invocation of init method failed; nested exception is org.apache.camel.FailedToCreateRouteException: Failed to create route route1 at: >>> process[null] <<< in route: Route(route1)[[From[direct:foo]] -> [process[null]]] because of ref must be specified on: process[null] at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:517) at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:286) ... 47 more Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'processor' defined in class org.myexample.camelissue.ContextStartupTest$Context: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'camelContext' defined in class org.myexample.camelissue.ContextStartupTest$Context: Invocation of init method failed; nested exception is org.apache.camel.FailedToCreateRouteException: Failed to create route route1 at: >>> process[null] <<< in route: Route(route1)[[From[direct:foo]] -> [process[null]]] because of ref must be specified on: process[null] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:529) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:293) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:290) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:191) at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:917) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:860) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:775) at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:489) ... 49 more Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'camelContext' defined in class org.myexample.camelissue.ContextStartupTest$Context: Invocation of init method failed; nested exception is org.apache.camel.FailedToCreateRouteException: Failed to create route route1 at: >>> process[null] <<< in route: Route(route1)[[From[direct:foo]] -> [process[null]]] because of ref must be specified on: process[null] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1513) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:521) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458) at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:293) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:290) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195) at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:441) at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:431) at org.springframework.context.support.AbstractApplicationContext.getBeansOfType(AbstractApplicationContext.java:1182) at org.apache.camel.spring.CamelBeanPostProcessor$1.getOrLookupCamelContext(CamelBeanPostProcessor.java:73) at org.apache.camel.spring.CamelBeanPostProcessor$1$1.getCamelContext(CamelBeanPostProcessor.java:106) at org.apache.camel.impl.CamelPostProcessorHelper.createInjectionProducerTemplate(CamelPostProcessorHelper.java:280) at org.apache.camel.impl.CamelPostProcessorHelper.getInjectionValue(CamelPostProcessorHelper.java:198) at org.apache.camel.impl.DefaultCamelBeanPostProcessor.injectField(DefaultCamelBeanPostProcessor.java:195) at org.apache.camel.impl.DefaultCamelBeanPostProcessor$1.doWith(DefaultCamelBeanPostProcessor.java:187) at org.apache.camel.util.ReflectionHelper.doWithFields(ReflectionHelper.java:73) at org.apache.camel.impl.DefaultCamelBeanPostProcessor.injectFields(DefaultCamelBeanPostProcessor.java:168) at org.apache.camel.impl.DefaultCamelBeanPostProcessor.postProcessBeforeInitialization(DefaultCamelBeanPostProcessor.java:82) at org.apache.camel.spring.CamelBeanPostProcessor.postProcessBeforeInitialization(CamelBeanPostProcessor.java:148) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:396) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1506) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:521) ... 58 more Caused by: org.apache.camel.FailedToCreateRouteException: Failed to create route route1 at: >>> process[null] <<< in route: Route(route1)[[From[direct:foo]] -> [process[null]]] because of ref must be specified on: process[null] at org.apache.camel.model.RouteDefinition.addRoutes(RouteDefinition.java:910) at org.apache.camel.model.RouteDefinition.addRoutes(RouteDefinition.java:175) at org.apache.camel.impl.DefaultCamelContext.startRoute(DefaultCamelContext.java:780) at org.apache.camel.impl.DefaultCamelContext.startRouteDefinitions(DefaultCamelContext.java:2068) at org.apache.camel.impl.DefaultCamelContext.doStartCamel(DefaultCamelContext.java:1816) at org.apache.camel.impl.DefaultCamelContext.doStart(DefaultCamelContext.java:1683) at org.apache.camel.support.ServiceSupport.start(ServiceSupport.java:61) at org.apache.camel.impl.DefaultCamelContext.start(DefaultCamelContext.java:1651) at org.apache.camel.spring.SpringCamelContext.maybeStart(SpringCamelContext.java:254) at org.apache.camel.spring.SpringCamelContext.afterPropertiesSet(SpringCamelContext.java:106) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1572) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1510) ... 80 more Caused by: java.lang.IllegalArgumentException: ref must be specified on: process[null] at org.apache.camel.util.ObjectHelper.notNull(ObjectHelper.java:316) at org.apache.camel.model.ProcessDefinition.createProcessor(ProcessDefinition.java:90) at org.apache.camel.model.ProcessorDefinition.makeProcessor(ProcessorDefinition.java:499) at org.apache.camel.model.ProcessorDefinition.addRoutes(ProcessorDefinition.java:212) at org.apache.camel.model.RouteDefinition.addRoutes(RouteDefinition.java:907) ... 91 more
