jaxb抛出javax.xml.bind.UnMarshalException：只有在osgi捆绑包中运行时，才需要元素（无

Question

我想在liberty osgi web应用程序中使用jaxb解组xml。

InputStream is = new FileInputStream(serviceXmlPath);
JAXBContext jaxbContext = JAXBContext.newInstance(Service.class);
Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
return jaxbUnmarshaller.unmarshal(is);

[err] javax.xml.bind.UnmarshalException: unexpected element (uri:"", local:"Service"). Expected elements are (none)
[err]   at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.handleEvent(UnmarshallingContext.java:660)

ClassLoader classloader = MyClass.class.getClassLoader();
jaxbContext = JAXBContext.newInstance(MyClass.class.getName(), classloader);

[err] javax.xml.bind.JAXBException: Unable to create context
 - with linked exception:
[java.lang.reflect.InvocationTargetException]

JAXBContext jaxbContext = JAXBContext.newInstance(Service.class);
JAXBContext jaxbContext2 = JAXBContext.newInstance();
Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();   

System.out.println("classloader of Service.class:" + Service.class.getClassLoader().toString());
System.out.println("classloader of JAXBContext:" + JAXBContext.class.getClassLoader());
System.out.println("classloader of jaxbContext:" + jaxbContext.getClass().getClassLoader());
System.out.println("classloader of jaxbContext2:" + jaxbContext2.getClass().getClassLoader());
System.out.println("classloader of jaxbUnmarshaller:" + Unmarshaller.class.getClassLoader());

当我运行它时，我得到了：

classloader of Service.class:org.eclipse.osgi.internal.loader.EquinoxClassLoader@b0adb798[DataService:1.0.0.qualifier(id=379)]
classloader of JAXBContext:org.eclipse.osgi.internal.loader.EquinoxClassLoader@271677de[com.ibm.ws.javaee.jaxb.2.2:1.0.11.cl50820151201-1942(id=343)]
classloader of jaxbContext:org.eclipse.osgi.internal.loader.EquinoxClassLoader@b997af78[com.ibm.ws.xlxp.1.5.3:1.0.11.cl50820151201-1942(id=341)]
classloader of jaxbContext2:org.eclipse.osgi.internal.loader.EquinoxClassLoader@b997af78[com.ibm.ws.xlxp.1.5.3:1.0.11.cl50820151201-1942(id=341)]
classloader of jaxbUnmarshaller:org.eclipse.osgi.internal.loader.EquinoxClassLoader@271677de[com.ibm.ws.javaee.jaxb.2.2:1.0.11.cl50820151201-1942(id=343)

请注意，是否传入类并不重要，它正在使用自己的类加载器（顺便说一句，这是在Liberty中启用了JAXB2.2。如果我禁用它，除了第一个类加载器之外，其他类加载器都显示为空，但行为相同）

Answer 1

我终于让它起作用了。在我的bundle清单中，我导入了javax.xml.bind包，我认为它是我所需要的全部，因为它是我在调用解组的代码中导入的。结果表明，我还需要添加javax.xml.bind.Annotation，因为模型类导入了javax.xml.bind.Annotation。

不管怎样，谢谢斯科特的评论