Question

我正在关注与JAXB编组/解组相关的线程一段时间了。

当我试图将Java对象转换为XML时，我遇到了问题，而XML中有一些接口。后来我发现这可以使用EclipseLink的MOxy来解决。 @ Bdoughan的文章http://blog.bdoughan.com/2012/07/jaxb-no-annotations-required.html，答案非常有帮助。但是现在，当我试图将生成的相同XML文件解组回Java对象时，我遇到了问题。

这是界面。

public interface TimePeriod extends Serializable{

/**
 * Return the end Time of the Time Period
 */
public Date getEndDate();

/**
 * Return the startTime of the Time Period
 */
public Date getStartDate();

/**
 * Sets the startTime of the Time period
 */
public void setStartDate(Date newStartDate);

/**
 * Sets the endTime of the Time period
 */
public void setEndDate(Date newEndDate);

}

其中一项实施

TaskStepTimePeriod

public class TaskStepTimePeriod implements TimePeriod {

private Date taskStartDate;
private Date taskEndDate;

@Override
public Date getEndDate() {
    return taskEndDate;
}

@Override
public Date getStartDate() {
    return taskStartDate;
}


public void setTaskStartDate(Date newVal) {
    this.taskStartDate = newVal;
}


public void setTaskEndDate(Date newVal) {
    this.taskEndDate = newVal;
}

@Override
public void setStartDate(Date newStartDate) {
    this.taskStartDate = newStartDate;
}

@Override
public void setEndDate(Date newEndDate) {
    this.taskEndDate = newEndDate;
}

}

Marshalled XML

<?xml version="1.0" encoding="UTF-8"?>
<plannedProgram>
  <taskStep>
     <endDate>2014-07-31T12:00:00.262+05:30</endDate>
     <startDate>2014-06-01T12:00:00.262+05:30</startDate>
  </taskStep>
</plannedProgram>

因此，当我尝试Unmarshall时，我收到此错误堆栈跟踪..

 Exception in thread "main" Local Exception Stack: 
  Exception [EclipseLink-63] (Eclipse Persistence Services -      2.6.1.v20150916-55dc7c3):       org.eclipse.persistence.exceptions.DescriptorException
  Exception Description: The instance creation method      [com.cts.axb.model.TimePeriod.<Default Constructor>], with no parameters,    does not exist, or is not accessible.
  Internal Exception: java.lang.NoSuchMethodException:    com.cts.axb.model.TimePeriod.<init>()
  Descriptor: XMLDescriptor(com.cts.axb.model.TimePeriod --> [])

它没有默认构造函数，但是在接口中？我真的很欣赏我做错了什么吗？

我是否错过了注释班级中的任何元素？

我的解组码。！

 try {
         context = JAXBContext.newInstance(PlannedProgram.class);    
         Unmarshaller jaxbUnmarshaller = context.createUnmarshaller();
         newMaintProg = (PlannedProgram) jaxbUnmarshaller.unmarshal(file);
         System.err.println("XML file succesffuly read");
     } catch (JAXBException e) {
         System.err.println("Error Reading /  Unmarshalling the XML file "+ e);          
     }

java.lang.NoSuchMethodException：JAXB Unmarshalling Interfaces

0 个答案: