Null pointer when parsing camelContext.xml file during startup

Question

This is an intermittent problem, roughly 4/5 starts hit null pointer. Camel-Context.xml is below.

• Error:

  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-Context.xml

  http://www.springframework.org/schema/beans http://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

I came across your question due to experiencing the same problem. On Feb 18, 2012 the 2.2.5 version of JAXB was released. After upgrading to 2.2.5, the problem seems to have been resolved. So far, it hasn't occurred again in testing.

See http://jaxb.java.net/ for details.

For reference, my configuration uses Camel 2.8.4 and Spring 3.0.5.