Web Service client rarely got NullPointerException inside Apache CXF code included in EAP 6.x and 7.x

Issue

Web Service client rarely failed with the following NullPointerException in Apache CXF included in EAP 6.x and 7.x:

java.lang.NullPointerException
    at org.apache.cxf.common.jaxb.JAXBUtils.createJAXBContextProxy(JAXBUtils.java:1425)
    at org.apache.cxf.jaxb.JAXBDataBinding.checkForJAXBAnnotations(JAXBDataBinding.java:433)
    at org.apache.cxf.jaxb.JAXBDataBinding.justCheckForJAXBAnnotations(JAXBDataBinding.java:427)
    at org.apache.cxf.jaxb.JAXBDataBinding.initialize(JAXBDataBinding.java:363)
    at org.apache.cxf.service.factory.AbstractServiceFactoryBean.initializeDataBindings(AbstractServiceFactoryBean.java:86)
    at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.buildServiceFromWSDL(ReflectionServiceFactoryBean.java:446)
    at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.initializeServiceModel(ReflectionServiceFactoryBean.java:548)
    at org.apache.cxf.service.factory.ReflectionServiceFactoryBean.create(ReflectionServiceFactoryBean.java:265)
    at org.apache.cxf.jaxws.support.JaxWsServiceFactoryBean.create(JaxWsServiceFactoryBean.java:215)
    at org.apache.cxf.frontend.AbstractWSDLBasedEndpointFactory.createEndpoint(AbstractWSDLBasedEndpointFactory.java:102)
    at org.apache.cxf.frontend.ClientFactoryBean.create(ClientFactoryBean.java:91)
    at org.apache.cxf.frontend.ClientProxyFactoryBean.create(ClientProxyFactoryBean.java:157)
    at org.apache.cxf.jaxws.JaxWsProxyFactoryBean.create(JaxWsProxyFactoryBean.java:142)
    at org.apache.cxf.jaxws.ServiceImpl.createPort(ServiceImpl.java:478)
    at org.jboss.wsf.stack.cxf.client.ProviderImpl$JBossWSServiceImpl.createPort(ProviderImpl.java:558)
    at org.apache.cxf.jaxws.ServiceImpl.getPort(ServiceImpl.java:329)
    at org.apache.cxf.jaxws.ServiceImpl.getPort(ServiceImpl.java:324)
    at javax.xml.ws.Service.getPort(Service.java:168) [jboss-jaxws-api_2.2_spec-2.0.2.Final-redhat-1.jar:2.0.2.Final-redhat-1]
        ...(snip)...