apache-servicemix-4.3.0-fuse-00-00 中的 ClasspathXMLApplicationContext 问题

【问题标题】：ClasspathXMLApplicationContext problem in apache-servicemix-4.3.0-fuse-00-00apache-servicemix-4.3.0-fuse-00-00 中的 ClasspathXMLApplicationContext 问题
【发布时间】：2011-05-04 04:48:05
【问题描述】：


我遵循了《行动中的骆驼》这本书第 14 章中的示例。我希望通过业务逻辑隐藏中间件。使用“camel:run:”进行开发时，一切似乎都运行良好。配置文件如下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:camel="http://camel.apache.org/schema/spring"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
       http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd
">
      <!-- camel activemq component to connect to the broker -->
      <bean id="activemq" class="org.apache.activemq.camel.component.ActiveMQComponent">
            <property name="brokerURL" value="tcp://localhost:61616" />
      </bean>

      <!-- the camel client -->
      <camel:camelContext xmlns="http://camel.apache.org/schema/spring">
            <proxy id="StreamProxy" serviceInterface="ird.StockStream.StreamService"
                  serviceUrl="activemq:queue:queueStream" />
      </camel:camelContext>

</beans>

然后出现了将其部署到 servicemix 中的要求。我遵循了保险丝指南并了解了所需的步骤。我需要将 bean 架构更改为（我假设）

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:osgi="http://camel.apache.org/schema/osgi"
       xmlns:osgix="http://www.springframework.org/schema/osgi-compendium"
       xmlns:ctx="http://www.springframework.org/schema/context"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
       http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd
       http://camel.apache.org/schema/osgi http://camel.apache.org/schema/osgi/camel-osgi.xsd
       http://www.springframework.org/schema/osgi-compendium http://www.springframework.org/schema/osgi-compendium/spring-osgi-compendium.xsd
       http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
">
      <!-- camel activemq component to connect to the broker -->
      <bean id="activemq" class="org.apache.activemq.camel.component.ActiveMQComponent">
            <property name="brokerURL" value="tcp://localhost:61616" />
      </bean>

      <!-- the camel client -->
      <osgi:camelContext xmlns="http://camel.apache.org/schema/spring">
            <proxy id="StreamProxy" serviceInterface="ird.StockStream.StreamService"
                  serviceUrl="activemq:queue:queueStream" />
      </osgi:camelContext>

</beans>

最后，为了在客户端使用代理，我这样做了：

AbstractXmlApplicationContext ctx = new ClassPathXmlApplicationContext(
                              "classpath:META-INF/spring/camel-client.xml");
                  streamService=(StreamService) ctx.getBean("StreamProxy");

我收到以下错误，我似乎无法修复。我不认为我在这里做错了什么，请帮助。我已经用尽了我的搜索，似乎没有人能够回答这个问题。感谢这里的任何帮助。我的 karaf.framework=equinox 和正确的包已经安装。

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'activemq' defined in class path resource [META-INF/spring/camel-client.xml]: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'camelContext': FactoryBean threw exception on object creation; nested ex
lPointerException
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:527)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
        at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:574)
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)
        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:425)
        at org.apache.xbean.spring.context.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:161)
        at org.apache.xbean.spring.context.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:51)
        at ird.StockStream.StreamClient.initProperties(StreamClient.java:83)
        at ird.StockStream.StreamClient.<init>(StreamClient.java:67)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at org.springframework.beans.BeanUtils.instantiateClass(BeanUtils.java:126)
        at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:71)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateBean(AbstractAutowireCapableBeanFactory.java:948)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:901)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:485)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
        at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:574)
        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:895)
        at org.springframework.osgi.context.support.AbstractDelegatedExecutionApplicationContext.access$1600(AbstractDelegatedExecutionApplicationContext.java:69)
        at org.springframework.osgi.context.support.AbstractDelegatedExecutionApplicationContext$4.run(AbstractDelegatedExecutionApplicationContext.java:355)
        at org.springframework.osgi.util.internal.PrivilegedUtils.executeWithCustomTCCL(PrivilegedUtils.java:85)
        at org.springframework.osgi.context.support.AbstractDelegatedExecutionApplicationContext.completeRefresh(AbstractDelegatedExecutionApplicationContext.java:320)
        at org.springframework.osgi.extender.internal.dependencies.startup.DependencyWaiterApplicationContextExecutor$CompleteRefreshTask.run(DependencyWaiterApplicationContextExecutor.java:136)
        at java.lang.Thread.run(Thread.java:619)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'camelContext': FactoryBean threw exception on object creation; nested exception is java.lang.NullPointerException
        at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:149)
        at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:109)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1414)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:245)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
        at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1075)
        at org.apache.camel.spring.CamelBeanPostProcessor.postProcessBeforeInitialization(CamelBeanPostProcessor.java:95)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:394)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1405)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
        at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:291)
        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:288)
        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:190)
        at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1075)
        at org.apache.camel.spring.CamelBeanPostProcessor.postProcessBeforeInitialization(CamelBeanPostProcessor.java:95)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:394)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1405)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
        ... 34 more
Caused by: java.lang.NullPointerException
        at org.apache.camel.core.osgi.OsgiPackageScanClassResolver.<init>(OsgiPackageScanClassResolver.java:39)
        at org.apache.camel.core.osgi.OsgiCamelContextHelper.osgiUpdate(OsgiCamelContextHelper.java:45)
        at org.apache.camel.osgi.OsgiSpringCamelContext.<init>(OsgiSpringCamelContext.java:34)
        at org.apache.camel.osgi.CamelContextFactoryBean.newCamelContext(CamelContextFactoryBean.java:50)
        at org.apache.camel.spring.CamelContextFactoryBean.createContext(CamelContextFactoryBean.java:279)
        at org.apache.camel.spring.CamelContextFactoryBean.getContext(CamelContextFactoryBean.java:290)
        at org.apache.camel.spring.CamelContextFactoryBean.getContext(CamelContextFactoryBean.java:79)
        at org.apache.camel.core.xml.AbstractCamelContextFactoryBean.getContext(AbstractCamelContextFactoryBean.java:594)
        at org.apache.camel.core.xml.AbstractCamelContextFactoryBean.getObject(AbstractCamelContextFactoryBean.java:108)
        at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:142)
        ... 53 more

【问题讨论】：

  • 是日志中仅存在此信息还是还有更多信息，例如堆栈跟踪？您可以在打印中启用调试日志并将日志放在此处吗？
  • 用stacktrace更新了帖子，也许现在更好了？
  • 令人惊讶的是，通过camel-maven-plugin使用正确的依赖项可以执行相同的配置。目标 camel:run 能够毫不费力地执行此操作。我猜这与我对上下文的声明有关：
  • AbstractXmlApplicationContext ctx = new ClassPathXmlApplicationContext("classpath:META-INF/spring/camel-client.xml"); streamService=(StreamService) ctx.getBean("StreamProxy");

标签： spring apache-camel osgi apache-servicemix fuseesb


【解决方案1】：

您应该不更改命名空间。命名空间http://camel.apache.org/schema/osgi 被@deprecated

并且您应该不再次使用 Spring 加载 XML 文件。

AbstractXmlApplicationContext ctx = new ClassPathXmlApplicationContext( "classpath:META-INF/spring/camel-client.xml");

你说的客户是什么意思？客户端是在 ESB 内部运行还是独立运行。客户端在哪里运行？

【讨论】：

  • 为错误的术语道歉，这里的客户端是流数据源。它托管在 ESB 中。客户端连接到外部托管的应用程序，获取数据并将其泵入 ESB。
  • 我想我需要澄清一下，现阶段有两个spring文件。 Camel-context.xml 包含路由定义。 Camel-client.xml 包含代理定义。我将两者分开，以免再次重新启动路线。
  • 我的应用程序使用 camel:run 运行得非常好。我想我正在寻找正确的步骤，以便我可以在 servicemix 中托管它。我一直无法找到相同的简明指南。请指出正确的方向。
  • 在 FuseSource 上查看 FUSE ESB 的文档。
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