骡子DataMapper IOException

Question

我有一个类层次结构，它有一个名为EntityModel的基类，还有两个类InvestorModel和AgentModel，每个类都直接继承并添加了一些属性。然后，我将创建Mule数据地图，以便将JSON映射到每个子类。

InvestorModel映射工作正常，但是AgentModel映射失败(在IDE预览中)，IOException声明它不能实例化EntityModel。这看起来很奇怪，因为它可以在InvestorModel映射中实例化它。我正在发布错误，但我没有任何源可供发布，因为这些只是映射文件。我只是不知道该从哪里开始找。

Mule Studio是最新的版本3.5.0

java.io.IOException: org.jetel.exception.JetelException: za.co.sci.core.shared.EntityModel can not be instantiated.
    at org.jetel.component.tree.writer.TreeFormatter.write(TreeFormatter.java:72)
    at org.jetel.util.MultiFileWriter.writeRecord2CurrentTarget(MultiFileWriter.java:420)
    at org.jetel.util.MultiFileWriter.write(MultiFileWriter.java:297)
    at org.jetel.component.TreeWriter.execute(TreeWriter.java:464)
    at org.jetel.graph.Node.run(Node.java:465)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
Caused by: org.jetel.exception.JetelException: za.co.sci.core.shared.EntityModel can not be instantiated.
    at com.opensys.cloveretl.component.tree.writer.bean.BeanWriter.a(Unknown Source)
    at com.opensys.cloveretl.component.tree.writer.bean.BeanWriter.a(Unknown Source)
    at com.opensys.cloveretl.component.tree.writer.bean.BeanWriter.a(Unknown Source)
    at com.opensys.cloveretl.component.tree.writer.bean.BeanWriter.writeStartNode(Unknown Source)
    at org.jetel.component.tree.writer.model.runtime.WritableObject.writeContent(WritableObject.java:67)
    at org.jetel.component.tree.writer.model.runtime.WritableContainer.write(WritableContainer.java:67)
    at org.jetel.component.tree.writer.model.runtime.WritableObject.writeContent(WritableObject.java:77)
    at org.jetel.component.tree.writer.model.runtime.WritableContainer.write(WritableContainer.java:67)
    at org.jetel.component.tree.writer.model.runtime.WritableObject.writeContent(WritableObject.java:77)
    at org.jetel.component.tree.writer.model.runtime.WritableContainer.write(WritableContainer.java:67)
    at org.jetel.component.tree.writer.model.runtime.WritableObject.writeContent(WritableObject.java:77)
    at org.jetel.component.tree.writer.model.runtime.WritableContainer.write(WritableContainer.java:67)
    at org.jetel.component.tree.writer.model.runtime.WritableObject.writeContent(WritableObject.java:77)
    at org.jetel.component.tree.writer.TreeFormatter.write(TreeFormatter.java:69)
    ... 7 more

类片段：

public abstract class EntityModel implements Serializable {
    protected Long id;
    private long entityNumber;
    private EntityStatus status;
    private String entityName;
...

public class AgentModel extends EntityModel implements Serializable{
    private int agentCode;
    private AgentType agentType;
    private AgentClass agentClass;
...

public class InvestorModel extends EntityModel implements Serializable {
    private boolean blockedRand;
    private String utAUTType;
...

Answer 1

结果表明，错误是由于基类是抽象的。很明显真的。

一张地图起作用的原因，而另一幅地图不起作用的原因是田地的顺序。映射到InvestorModel上的第一个字段是在InvestorModel中定义的字段，因此映射程序知道要实例化哪个类。在AgentModel映射中，第一个字段是在抽象类EntityModel上定义的，因此映射程序试图实例化该类，但失败了，我选择了AgentModel作为目标并不重要。