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我们创建了一个简单的测试包，但只要我们尝试在我们的骆驼路由中使用MongoDB，路由就不会再启动。MongoDB不能在Karaf 4.0.8上使用Camel 2.18.1
蓝图很简单：
<?xml version="1.0" encoding="UTF-8"?>
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:cm="http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.1.0"
xsi:schemaLocation="
http://www.osgi.org/xmlns/blueprint/v1.0.0 https://www.osgi.org/xmlns/blueprint/v1.0.0/blueprint.xsd
http://camel.apache.org/schema/blueprint http://camel.apache.org/schema/blueprint/camel-blueprint.xsd
http://aries.apache.org/blueprint/xmlns/blueprint-cm/v1.1.0 http://aries.apache.org/schemas/blueprint-cm/blueprint-cm-1.1.0.xsd">
<bean id="mongo" class="com.mongodb.Mongo">
<argument value="localhost"/>
</bean>
<camelContext id="blueprint-bean-context"
xmlns="http://camel.apache.org/schema/blueprint">
<route id="testTimer">
<from uri="timer:testTimer?period=5000" />
<setBody>
<spel>{"type": "product"}</spel>
</setBody>
<to uri="mongodb:mongo?database=testdb&collection=mycollection&operation=findAll" />
<log message="Result was queried" />
</route>
</camelContext>
</blueprint>
MongoDB是添加为POM的依赖。 DEBUG模式下的日志摘录给出了这些行：
2017-01-24 13:41:27,672 | DEBUG | raf-4.0.8/deploy | ReferenceRecipe | 12 - org.apache.aries.blueprint.core - 1.7.1 | Binding reference .camelBlueprint.languageResolver.spel to [org.apache.camel.spi.LanguageResolver]
2017-01-24 13:41:27,672 | DEBUG | raf-4.0.8/deploy | BlueprintLanguageResolver | 55 - org.apache.camel.camel-blueprint - 2.18.1 | Found language resolver: spel in registry: [email protected]375f
2017-01-24 13:41:27,673 | DEBUG | raf-4.0.8/deploy | DefaultChannel | 58 - org.apache.camel.camel-core - 2.18.1 | Initialize channel for target: 'SetBody[spel{SpelExpression[{"type": "product"}]}]'
2017-01-24 13:41:27,673 | DEBUG | raf-4.0.8/deploy | BlueprintContainerImpl | 12 - org.apache.aries.blueprint.core - 1.7.1 | Instantiating component blueprintBundle
2017-01-24 13:41:27,676 | DEBUG | raf-4.0.8/deploy | DefaultManagementAgent | 58 - org.apache.camel.camel-core - 2.18.1 | Registered MBean with ObjectName: org.apache.camel:context=de.test.bundle-x1-blueprint-bean-context,type=tracer,name=BacklogTracer
2017-01-24 13:41:27,676 | DEBUG | raf-4.0.8/deploy | BlueprintContainerImpl | 12 - org.apache.aries.blueprint.core - 1.7.1 | Instantiating component blueprintBundle
2017-01-24 13:41:27,680 | DEBUG | raf-4.0.8/deploy | DefaultManagementAgent | 58 - org.apache.camel.camel-core - 2.18.1 | Registered MBean with ObjectName: org.apache.camel:context=de.test.bundle-x1-blueprint-bean-context,type=tracer,name=BacklogDebugger
2017-01-24 13:41:27,683 | DEBUG | raf-4.0.8/deploy | DefaultManagementAgent | 58 - org.apache.camel.camel-core - 2.18.1 | Registered MBean with ObjectName: org.apache.camel:context=de.test.bundle-x1-blueprint-bean-context,type=errorhandlers,name="DefaultErrorHandlerBuilder(ref:CamelDefaultErrorHandlerBuilder)"
2017-01-24 13:41:27,686 | DEBUG | raf-4.0.8/deploy | DefaultComponent | 58 - org.apache.camel.camel-core - 2.18.1 | Creating endpoint uri=[mongodb://mongo?collection=processing_requests&database=genex&operation=findAll], path=[mongo]
2017-01-24 13:41:27,686 | DEBUG | raf-4.0.8/deploy | BlueprintContainerImpl | 12 - org.apache.aries.blueprint.core - 1.7.1 | Instantiating component mongo
2017-01-24 13:41:27,687 | INFO | raf-4.0.8/deploy | BlueprintCamelContext | 58 - org.apache.camel.camel-core - 2.18.1 | Apache Camel 2.18.1 (CamelContext: blueprint-bean-context) is shutting down
2017-01-24 13:41:27,687 | DEBUG | raf-4.0.8/deploy | efaultAsyncProcessorAwaitManager | 58 - org.apache.camel.camel-core - 2.18.1 | Shutting down with no inflight threads.
2017-01-24 13:41:27,688 | DEBUG | raf-4.0.8/deploy | TimerListenerManager | 58 - org.apache.camel.camel-core - 2.18.1 | Removed TimerListener: [email protected]
2017-01-24 13:41:27,688 | DEBUG | raf-4.0.8/deploy | DefaultManagementAgent | 58 - org.apache.camel.camel-core - 2.18.1 | Unregistered MBean with ObjectName: org.apache.camel:context=de.test.bundle-x1-blueprint-bean-context,type=context,name="blueprint-bean-context"
2017-01-24 13:41:27,688 | DEBUG | raf-4.0.8/deploy | DefaultInflightRepository | 58 - org.apache.camel.camel-core - 2.18.1 | Shutting down with no inflight exchanges.
为什么Camel上下文立即启动和关闭？定时器未执行且日志消息从不打印。一旦我们删除调用MongoDB的to，它就会起作用。