java - 启动时解析camelContext.xml文件时出现空指针

Question

这是一个间歇性问题，大约 4/5 开始命中空指针。 Camel-Context.xml 如下。

• 错误:

  2011-10-18 08:31:25,245 [main           ] INFO  MainSupport                    -   Apache Camel 2.8.0 stopping
  Exception in thread "main" org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from file [D:\Users\michaelb\workspace\camel-example-spring-eda\target\classes\META-INF\spring\camel-context-NERD.xml]; nested exception is java.lang.NullPointerException
  at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:412)
  at    org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:334)
      at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:302)
      at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:143)
      at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:178)
      at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:149)
      at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:212)
      at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:126)
      at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:92)
      at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:130)
      at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:467)
      at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:397)
      at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
      at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:93)
      at org.apache.camel.spring.Main.createDefaultApplicationContext(Main.java:185)
      at org.apache.camel.spring.Main.doStart(Main.java:139)
      at org.apache.camel.impl.ServiceSupport.start(ServiceSupport.java:67)
      at org.apache.camel.impl.ServiceSupport.start(ServiceSupport.java:54)
      at org.apache.camel.impl.MainSupport.run(MainSupport.java:136)
      at org.apache.camel.impl.MainSupport.run(MainSupport.java:322)
      at com.softwareag.eda.NERD.main(NERD.java:39)
  Caused by: java.lang.NullPointerException
      at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.checkOverrideProperties(ClassBeanInfoImpl.java:190)
      at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:171)
      at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:494)
  

• Camel 上下文.xml

  http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsd http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd"> org.apache.camel.example.spring.eda

            <!-- Announce route -->
            <route id="Announcer" startupOrder="3">
                <from uri="file:src/data?noop=true" />
                <choice>
                    <when>
                        <xpath>$eventtype = 'shipment'</xpath>
                        <to uri="jmsEDA:topic:orderMgmt" />
                    </when>
                    <otherwise>
                        <to uri="jmsEDA:topic:orderMgmt" />
                    </otherwise>
                </choice>
            </route>

            <!-- Listen route -->
            <route id="Listener" startupOrder="2">
                <from uri="jmsEDA:topic:orderMgmt" />
                <to uri="file://target/test?noop=true" />
                <to uri="outputToScreen" />
                <log message="done" />
            </route>

        </camelContext>

        <!-- EDA JMS endpoint URL -->
        <bean id="jmsEDA" class="org.apache.camel.component.jms.JmsComponent">
            <property name="connectionFactory">
                <bean class="org.apache.activemq.ActiveMQConnectionFactory">
                    <property name="brokerURL"
                        value="vm://localhost?broker.persistent=false&amp;broker.useJmx=false" />
                </bean>
            </property>
        </bean>

        <!-- Screen output endpoint -->
        <bean id="outputToScreen"
            class="com.softwareag.eda.NERD.outputToScreen">
        </bean>

    </beans>

Answer 1

由于遇到同样的问题，我遇到了你的问题。 2012 年 2 月 18 日发布了 JAXB 的 2.2.5 版本。升级到2.2.5后，问题好像解决了。到目前为止，在测试中没有再次发生。

参见 http://jaxb.java.net/了解详情。

作为引用，我的配置使用 Camel 2.8.4 和 Spring 3.0.5。