我正试图封送一个有 DataHandler jaxb（2.1.12）的字段。对于流媒体支持 DataHandler 注解为@ XmlAttachmentRef . web服务上的序列化和流式处理（jboss上的metro）可以很好地工作，但是使用jaxb的普通编组却不行。
下面是一个简单的例子：
public class DataHandlerAttachmentSerialization {
@XmlRootElement
static class RootObject {
@XmlElement
@XmlAttachmentRef // Works without this, but required for streaming
DataHandler dataHandler = new DataHandler(
new com.sun.xml.ws.util.ByteArrayDataSource(
" ".getBytes(), "application/octet-stream"));
}
@Test
public void test() throws JAXBException {
JAXBContext context = JAXBContext.newInstance(RootObject.class);
Marshaller marshaller = context.createMarshaller();
StringWriter writer = new StringWriter();
marshaller.marshal(new RootObject(), writer);
Assert.assertNotNull(writer.toString());
}
}运行此测试将产生以下堆栈跟踪：
javax.xml.bind.MarshalException
- with linked exception:
[com.sun.xml.bind.api.AccessorException: java.lang.NullPointerException]
at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:318)
at com.sun.xml.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:244)
at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:96)
...
Caused by: com.sun.xml.bind.api.AccessorException: java.lang.NullPointerException
at com.sun.xml.bind.v2.runtime.XMLSerializer.reportError(XMLSerializer.java:246)
at com.sun.xml.bind.v2.runtime.XMLSerializer.reportError(XMLSerializer.java:261)
at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:335)
at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsSoleContent(XMLSerializer.java:593)
at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeRoot(ClassBeanInfoImpl.java:320)
at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsRoot(XMLSerializer.java:494)
at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:315)
... 25 more
Caused by: com.sun.xml.bind.api.AccessorException: java.lang.NullPointerException
at com.sun.xml.bind.v2.runtime.reflect.AdaptedAccessor.get(AdaptedAccessor.java:74)
at com.sun.xml.bind.v2.runtime.reflect.TransducedAccessor$CompositeTransducedAccessorImpl.writeLeafElement(TransducedAccessor.java:250)
at com.sun.xml.bind.v2.runtime.property.SingleElementLeafProperty.serializeBody(SingleElementLeafProperty.java:98)
at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:332)
... 29 more
Caused by: java.lang.NullPointerException
at com.sun.xml.bind.v2.runtime.SwaRefAdapter.marshal(SwaRefAdapter.java:80)
at com.sun.xml.bind.v2.runtime.SwaRefAdapter.marshal(SwaRefAdapter.java:65)
at com.sun.xml.bind.v2.runtime.reflect.AdaptedAccessor.get(AdaptedAccessor.java:72)
... 32 more第80行输入 SwaRefAdapter 是 return am.addSwaRefAttachment(data); 以及 am 被分配了 AttachmentMarshaller am = XMLSerializer.getInstance().attachmentMarshaller; 看来是这样 attachmentMarshaller 如果 @XmlAttachmentRef 存在。
我是否需要进行不同的设置，或者以不同的方式使用jaxbapi来处理附件？
1条答案
按热度按时间n3ipq98p1#
当在jax-ws环境之外使用jaxb时，jaxb实现应该是默认的内联，将xml文档中的二进制内容作为base64binary。
这似乎是jaxb的metro实现中的一个bug（jdk/jre中包含的ri）。如果您使用另一个jaxb实现，如eclipselinkjaxb（moxy），这将正常工作。要使用eclipselink moxy，请将eclipselink.jar（此处提供）添加到类路径中，并在模型类中添加jaxb.properties文件，其中包含以下内容：
jax-ws注册attachmentmarshaller和attachmentunmarshaller来处理jaxb模型中的二进制内容。如果需要，可以在使用jaxb standalone时指定自己的。
http://download.oracle.com/docs/cd/e17409_01/javase/6/docs/api/javax/xml/bind/attachment/attachmentmarshaller.html