JAXWS-RT：获取 com.sun.xml.ws.spi.db.DatabindingException 绑定一个简单的类

Question

我正在使用 JAXWS-RT 构建一个小型 SOAP Web 服务； 我有一个简单的类，如下所示：

public class Task {

    public String name;
    public String context;
    public String project;
    public PriorityType priority;

    public Task(String name, String context, String project, PriorityType priority) {
        this.name = name;
        this.context = context;
        this.project = project;
        this.priority = priority;
    }

    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }

    // ... etc (setters and getters)

}

这是我使用此任务类的 Web 服务中的方法：

    @WebMethod()
    public Task addTask(String taskName, String taskContext, String taskProject, PriorityType taskPriority) {    
        ToDoList taskList = new ToDoList(); // some ToDoList class
        taskList = // some method from which I get an existing To-Do List

        // ADDING a Task to my To-Do List
        Task task = new Task(taskName, taskContext, taskProject, taskPriority);
        taskList.addTask(task);

        // Returning the created task as a result of calling this method
        return task;
    }

在编译我的代码时，我得到了这个异常输出：

    Exception in thread "main" com.sun.xml.ws.spi.db.DatabindingException: com.sun.xml.bind.v2.runtime.IllegalAnnotationsException: 4 counts of IllegalAnnotationExceptions
    La clase tiene dos propiedades con el mismo nombre "context"
        this problem is related to the following location:
            at public java.lang.String bigws.todows.Task.getContext()
            at bigws.todows.Task
            at public bigws.todows.Task bigws.todows.jaxws.AddTaskResponse._return
            at bigws.todows.jaxws.AddTaskResponse
        this problem is related to the following location:
            at public java.lang.String bigws.todows.Task.context
            at bigws.todows.Task
            at public bigws.todows.Task bigws.todows.jaxws.AddTaskResponse._return
            at bigws.todows.jaxws.AddTaskResponse
    La clase tiene dos propiedades con el mismo nombre "name"
        this problem is related to the following location:
            at public java.lang.String bigws.todows.Task.getName()
            at bigws.todows.Task
            at public bigws.todows.Task bigws.todows.jaxws.AddTaskResponse._return
            at bigws.todows.jaxws.AddTaskResponse
        this problem is related to the following location:
            at public java.lang.String bigws.todows.Task.name
            at bigws.todows.Task
            at public bigws.todows.Task bigws.todows.jaxws.AddTaskResponse._return
            at bigws.todows.jaxws.AddTaskResponse
    La clase tiene dos propiedades con el mismo nombre "priority"
        this problem is related to the following location:
            at public bigws.todows.PriorityType bigws.todows.Task.getPriority()
            at bigws.todows.Task
            at public bigws.todows.Task bigws.todows.jaxws.AddTaskResponse._return
            at bigws.todows.jaxws.AddTaskResponse
        this problem is related to the following location:
            at public bigws.todows.PriorityType bigws.todows.Task.priority
            at bigws.todows.Task
            at public bigws.todows.Task bigws.todows.jaxws.AddTaskResponse._return
            at bigws.todows.jaxws.AddTaskResponse
    La clase tiene dos propiedades con el mismo nombre "project"
        this problem is related to the following location:
            at public java.lang.String bigws.todows.Task.getProject()
            at bigws.todows.Task
            at public bigws.todows.Task bigws.todows.jaxws.AddTaskResponse._return
            at bigws.todows.jaxws.AddTaskResponse
        this problem is related to the following location:
            at public java.lang.String bigws.todows.Task.project
            at bigws.todows.Task
            at public bigws.todows.Task bigws.todows.jaxws.AddTaskResponse._return
            at bigws.todows.jaxws.AddTaskResponse

        at com.sun.xml.ws.db.glassfish.JAXBRIContextFactory.newContext(JAXBRIContextFactory.java:104)
        at com.sun.xml.ws.spi.db.BindingContextFactory.create(BindingContextFactory.java:182)
        at com.sun.xml.ws.model.AbstractSEIModelImpl$1.run(AbstractSEIModelImpl.java:218)
        at com.sun.xml.ws.model.AbstractSEIModelImpl$1.run(AbstractSEIModelImpl.java:191)
        at java.security.AccessController.doPrivileged(Native Method)
        at com.sun.xml.ws.model.AbstractSEIModelImpl.createJAXBContext(AbstractSEIModelImpl.java:191)
        at com.sun.xml.ws.model.AbstractSEIModelImpl.postProcess(AbstractSEIModelImpl.java:110)
        at com.sun.xml.ws.model.RuntimeModeler.buildRuntimeModel(RuntimeModeler.java:339)
        at com.sun.xml.ws.db.DatabindingImpl.<init>(DatabindingImpl.java:100)
        at com.sun.xml.ws.db.DatabindingProviderImpl.create(DatabindingProviderImpl.java:74)
        at com.sun.xml.ws.db.DatabindingProviderImpl.create(DatabindingProviderImpl.java:58)
        at com.sun.xml.ws.db.DatabindingFactoryImpl.createRuntime(DatabindingFactoryImpl.java:127)
        at com.sun.xml.ws.server.EndpointFactory.createSEIModel(EndpointFactory.java:487)
        at com.sun.xml.ws.server.EndpointFactory.create(EndpointFactory.java:283)
        at com.sun.xml.ws.server.EndpointFactory.createEndpoint(EndpointFactory.java:158)
        at com.sun.xml.ws.api.server.WSEndpoint.create(WSEndpoint.java:577)
        at com.sun.xml.ws.api.server.WSEndpoint.create(WSEndpoint.java:560)
        at com.sun.xml.ws.transport.http.server.EndpointImpl.createEndpoint(EndpointImpl.java:323)
        at com.sun.xm

l.ws.transport.http.server.EndpointImpl.publish(EndpointImpl.java:246)
    at com.sun.xml.ws.spi.ProviderImpl.createAndPublishEndpoint(ProviderImpl.java:134)
    at javax.xml.ws.Endpoint.publish(Unknown Source)
    at bigws.todows.Server.main(Server.java:8)
Caused by: com.sun.xml.bind.v2.runtime.IllegalAnnotationsException: 4 counts of IllegalAnnotationExceptions
La clase tiene dos propiedades con el mismo nombre "context"
    this problem is related to the following location:
        at public java.lang.String bigws.todows.Task.getContext()
        at bigws.todows.Task
        at public bigws.todows.Task bigws.todows.jaxws.AddTaskResponse._return
        at bigws.todows.jaxws.AddTaskResponse
    this problem is related to the following location:
        at public java.lang.String bigws.todows.Task.context
        at bigws.todows.Task
        at public bigws.todows.Task bigws.todows.jaxws.AddTaskResponse._return
        at bigws.todows.jaxws.AddTaskResponse
La clase tiene dos propiedades con el mismo nombre "name"
    this problem is related to the following location:
        at public java.lang.String bigws.todows.Task.getName()
        at bigws.todows.Task
        at public bigws.todows.Task bigws.todows.jaxws.AddTaskResponse._return
        at bigws.todows.jaxws.AddTaskResponse
    this problem is related to the following location:
        at public java.lang.String bigws.todows.Task.name
        at bigws.todows.Task
        at public bigws.todows.Task bigws.todows.jaxws.AddTaskResponse._return
        at bigws.todows.jaxws.AddTaskResponse
La clase tiene dos propiedades con el mismo nombre "priority"
    this problem is related to the following location:
        at public bigws.todows.PriorityType bigws.todows.Task.getPriority()
        at bigws.todows.Task
        at public bigws.todows.Task bigws.todows.jaxws.AddTaskResponse._return
        at bigws.todows.jaxws.AddTaskResponse
    this problem is related to the following location:
        at public bigws.todows.PriorityType bigws.todows.Task.priority
        at bigws.todows.Task
        at public bigws.todows.Task bigws.todows.jaxws.AddTaskResponse._return
        at bigws.todows.jaxws.AddTaskResponse
La clase tiene dos propiedades con el mismo nombre "project"
    this problem is related to the following location:
        at public java.lang.String bigws.todows.Task.getProject()
        at bigws.todows.Task
        at public bigws.todows.Task bigws.todows.jaxws.AddTaskResponse._return
        at bigws.todows.jaxws.AddTaskResponse
    this problem is related to the following location:
        at public java.lang.String bigws.todows.Task.project
        at bigws.todows.Task
        at public bigws.todows.Task bigws.todows.jaxws.AddTaskResponse._return
        at bigws.todows.jaxws.AddTaskResponse
at com.sun.xml.bind.v2.runtime.IllegalAnnotationsException$Builder.check(IllegalAnnotationsException.java:106)
at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(JAXBContextImpl.java:471)
at com.sun.xml.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:303)
at com.sun.xml.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:142)
at com.sun.xml.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1174)
at com.sun.xml.bind.v2.ContextFactory.createContext(ContextFactory.java:162)
at com.sun.xml.bind.api.JAXBRIContext.newInstance(JAXBRIContext.java:168)
at com.sun.xml.bind.api.JAXBRIContext.newInstance(JAXBRIContext.java:112)
at com.sun.xml.ws.developer.JAXBContextFactory$1.createJAXBContext(JAXBContextFactory.java:113)
at com.sun.xml.ws.db.glassfish.JAXBRIContextFactory.newContext(JAXBRIContextFactory.java:92)
... 21 more

我也试过给我的任务类私有类变量一个不同的名字，例如：

public class Task {

    public String taskName;
    public String taskContext;
    public String taskProject;
    public PriorityType taskPriority;

    // etc. 
}

这样我的代码可以完美编译并且我的 Web 服务工作正常，但是我得到了带有重复变量的SOAP XML 响应。 使用SoapUI工具，这是通过调用addTask()方法重命名我的类变量后得到的响应：

<S:Envelope xmlns:S="http://schemas.xmlsoap.org/soap/envelope/">
   <S:Body>
      <ns2:addTaskResponse xmlns:ns2="http://todows.bigws/">
         <return>
            <taskName>Task Name</taskName>
            <taskContext>Task Context</taskContext>
            <taskProject>Task Project</taskProject>
            <taskPriority>LOW</taskPriority>
            <context>Task Context</context>
            <name>Task Name</name>
            <priority>LOW</priority>
            <project>Task Project</project>
         </return>
      </ns2:addTaskResponse>
   </S:Body>
</S:Envelope>

我所有的 Web 服务代码都可以在这里找到：Github Repo 。

为什么会发生这种情况？ 谢谢！

Answer 1

JAXB通过查找遵循JavaBeans约定和公共字段的属性来发现对象中的属性。 以下示例显示了几个可以读取 ( get ) 和写入 ( set ) 的属性。 请注意，JavaBeans 属性不要求基础字段具有相同的名称。 其他组合也是可能的。 例如，只读属性有一个 getter 方法但没有 setter。 只写属性只有一个 setter 方法。 布尔属性的一个特殊情况允许使用is而不是get定义访问器方法。 如果JAXB发现冲突（例如名为name的公共字段和名为getName的 getter），它将失败。

public class Example {
   public String  first;         // visible -> maps to <first>
   private String second;        
   private String third;         
   private boolean fourth;       
   public String getSecond() {   // visible -> maps to <second>
      return second;
   }
   public void setSecond(String s) 
      second = s;
   }
   public String getSecondBis() {   // visible -> maps to <secondBis>
      return third;
   }
   public void setSecondBis(String s) 
      third = s;
   }
   public boolean isFourth() {   // visible -> maps to <fourth>
      return fourth;
   }
   public vois setFourth(boolean b) 
      fourth = b;
   }
   public String getFirst() {   // invalid!!! getFirst clashes with public first
      return first;
   }
   public void setFirst(String s) 
      first = s;
   }
}

Answer 2

我认为您的 Task 对象的所有属性都应该是私有的。 异常表示您有重复的属性。 在服务中，您以两种方法返回 List，因此 Task 对象必须与 JAXB 兼容，或者换句话说，至少是一个 Java Bean。