Java EWS空指针异常getExchangeServicePort

有时，当我运行这段代码时，我会得到一个

NullPointerException

。它并不总是来。我尝试了两个版本，但有相同的例外

ExchangeService service = new ExchangeService();

第1版：

port = service.getExchangeServicePort();

第2版：

port = service.getPort(new QName("http://schemas.microsoft.com/exchange/services/2006/messages","ExchangeServicePort"),ExchangeServicePortType.class);

例外情况：

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)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:513)
    at com.sun.xml.internal.bind.v2.runtime.property.ArrayElementProperty.<init>(ArrayElementProperty.java:97)
    at com.sun.xml.internal.bind.v2.runtime.property.ArrayElementNodeProperty.<init>(ArrayElementNodeProperty.java:47)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    at com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create(PropertyFactory.java:113)
    at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:166)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:494)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:513)
    at com.sun.xml.internal.bind.v2.runtime.property.SingleElementNodeProperty.<init>(SingleElementNodeProperty.java:90)
    at sun.reflect.GeneratedConstructorAccessor21.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    at com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create(PropertyFactory.java:113)
    at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:166)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:494)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:513)
    at com.sun.xml.internal.bind.v2.runtime.property.SingleElementNodeProperty.<init>(SingleElementNodeProperty.java:90)
    at sun.reflect.GeneratedConstructorAccessor21.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    at com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create(PropertyFactory.java:113)
    at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:166)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:494)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:513)
    at com.sun.xml.internal.bind.v2.runtime.property.ArrayElementProperty.<init>(ArrayElementProperty.java:97)
    at com.sun.xml.internal.bind.v2.runtime.property.ArrayElementNodeProperty.<init>(ArrayElementNodeProperty.java:47)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    at com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create(PropertyFactory.java:113)
    at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:166)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:494)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:513)
    at com.sun.xml.internal.bind.v2.runtime.property.SingleElementNodeProperty.<init>(SingleElementNodeProperty.java:90)
    at sun.reflect.GeneratedConstructorAccessor21.newInstance(Unknown Source)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
    at com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create(PropertyFactory.java:113)
    at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:166)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:494)
    at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:153)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:494)
    at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:153)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:494)
    at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(ClassBeanInfoImpl.java:153)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(JAXBContextImpl.java:494)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:311)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:126)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1142)
    at com.sun.xml.internal.bind.v2.ContextFactory.createContext(ContextFactory.java:173)
    at com.sun.xml.internal.bind.api.JAXBRIContext.newInstance(JAXBRIContext.java:96)
    at com.sun.xml.internal.ws.developer.JAXBContextFactory$1.createJAXBContext(JAXBContextFactory.java:98)
    at com.sun.xml.internal.ws.model.AbstractSEIModelImpl$1.run(AbstractSEIModelImpl.java:151)
    at com.sun.xml.internal.ws.model.AbstractSEIModelImpl$1.run(AbstractSEIModelImpl.java:143)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.xml.internal.ws.model.AbstractSEIModelImpl.createJAXBContext(AbstractSEIModelImpl.java:143)
    at com.sun.xml.internal.ws.model.AbstractSEIModelImpl.postProcess(AbstractSEIModelImpl.java:84)
    at com.sun.xml.internal.ws.model.RuntimeModeler.buildRuntimeModel(RuntimeModeler.java:235)
    at com.sun.xml.internal.ws.client.WSServiceDelegate.createSEIPortInfo(WSServiceDelegate.java:652)
    at com.sun.xml.internal.ws.client.WSServiceDelegate.addSEI(WSServiceDelegate.java:640)
    at com.sun.xml.internal.ws.client.WSServiceDelegate.getPort(WSServiceDelegate.java:332)
    at com.sun.xml.internal.ws.client.WSServiceDelegate.getPort(WSServiceDelegate.java:315)
    at com.sun.xml.internal.ws.client.WSServiceDelegate.getPort(WSServiceDelegate.java:297)
    at javax.xml.ws.Service.getPort(Service.java:119)

java.lang.NullPointerException
位于com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.checkOverrideProperties（ClassBeanInfoImpl.java:190）
位于com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl。（ClassBeanInfoImpl.java:171）
位于com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate（JAXBContextImpl.java:494）
位于com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate（JAXBContextImpl.java:513）
位于com.sun.xml.internal.bind.v2.runtime.property.ArrayElementProperty.（ArrayElementProperty.java:97）
位于com.sun.xml.internal.bind.v2.runtime.property.ArrayElementNodeProperty。（ArrayElementNodeProperty.java:47）
位于sun.reflect.NativeConstructorAccessorImpl.newInstance0（本机方法）
位于sun.reflect.NativeConstructorAccessorImpl.newInstance（NativeConstructorAccessorImpl.java:57）
在sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:45）
位于java.lang.reflect.Constructor.newInstance（Constructor.java:525）
位于com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create（PropertyFactory.java:113）
位于com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.（ClassBeanInfoImpl.java:166）
位于com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate（JAXBContextImpl.java:494）
位于com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate（JAXBContextImpl.java:513）
位于com.sun.xml.internal.bind.v2.runtime.property.SingleElementNodeProperty。（SingleElementNodeProperty.java:90）
位于sun.reflect.GeneratedConstructorAccessor21.newInstance（未知源）
在sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:45）
位于java.lang.reflect.Constructor.newInstance（Constructor.java:525）
位于com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create（PropertyFactory.java:113）
位于com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.（ClassBeanInfoImpl.java:166）
位于com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate（JAXBContextImpl.java:494）
位于com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate（JAXBContextImpl.java:513）
位于com.sun.xml.internal.bind.v2.runtime.property.SingleElementNodeProperty。（SingleElementNodeProperty.java:90）
位于sun.reflect.GeneratedConstructorAccessor21.newInstance（未知源）
在sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:45）
位于java.lang.reflect.Constructor.newInstance（Constructor.java:525）
位于com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create（PropertyFactory.java:113）
位于com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.（ClassBeanInfoImpl.java:166）
位于com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate（JAXBContextImpl.java:494）
位于com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate（JAXBContextImpl.java:513）
位于com.sun.xml.internal.bind.v2.runtime.property.ArrayElementProperty.（ArrayElementProperty.java:97）
位于com.sun.xml.internal.bind.v2.runtime.property.ArrayElementNodeProperty。（ArrayElementNodeProperty.java:47）
位于sun.reflect.NativeConstructorAccessorImpl.newInstance0（本机方法）
位于sun.reflect.NativeConstructorAccessorImpl.newInstance（NativeConstructorAccessorImpl.java:57）
在sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:45）
位于java.lang.reflect.Constructor.newInstance（Constructor.java:525）
位于com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create（PropertyFactory.java:113）
位于com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.（ClassBeanInfoImpl.java:166）
位于com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate（JAXBContextImpl.java:494）
位于com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate（JAXBContextImpl.java:513）
位于com.sun.xml.internal.bind.v2.runtime.property.SingleElementNodeProperty。（SingleElementNodeProperty.java:90）
位于sun.reflect.GeneratedConstructorAccessor21.newInstance（未知源）
在sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:45）
位于java.lang.reflect.Constructor.newInstance（Constructor.java:525）
位于com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create（PropertyFactory.java:113）
位于com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.（ClassBeanInfoImpl.java:166）
位于com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate（JAXBContextImpl.java:494）
位于com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl。（ClassBeanInfoImpl.java:153）
位于com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate（JAXBContextImpl.java:494）
位于com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl。（ClassBeanInfoImpl.java:153）
位于com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate（JAXBContextImpl.java:494）
位于com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl。（ClassBeanInfoImpl.java:153）
位于com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate（JAXBContextImpl.java:494）
位于com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.（JAXBContextImpl.java:311）
位于com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.（JAXBContextImpl.java:126）
位于com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build（JAXBContextImpl.java:1142）
位于com.sun.xml.internal.bind.v2.ContextFactory.createContext（ContextFactory.java:173）
位于com.sun.xml.internal.bind.api.JAXBRIContext.newInstance（JAXBRIContext.java:96）
位于com.sun.xml.internal.ws.developer.JAXBContextFactory$1.createJAXBContext（JAXBContextFactory.java:98）
位于com.sun.xml.internal.ws.model.AbstractSE
    JaxWsProxyFactoryBean factory = new JaxWsProxyFactoryBean();
    factory.setServiceClass(ExchangeServicePortType.class);
    factory.setAddress(url);

    port = (ExchangeServicePortType) factory.create();

    Client client = ClientProxy.getClient(port);
    HTTPConduit http = (HTTPConduit) client.getConduit();

    HTTPClientPolicy httpClientPolicy = new HTTPClientPolicy();

    httpClientPolicy.setAllowChunking(false);

    http.setClient(httpClientPolicy);