使用JPA 2.0在GAE数据存储中执行一对一关系时出现StackOverflowerError

Question

我有两张桌子文件夹

文件夹JAVA

@Entity
public class Folder implements IsSerializable{

    @Id
    @Column(name = "fvseID")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Extension(vendorName = "datanucleus", key = "gae.encoded-pk", value = "true")
    private String fvseID;

    @OneToOne
    @JoinColumn(name="vseID")
    private VirtualSystemEntry vse=new VirtualSystemEntry();
}

虚拟系统。JAVA

@Entity
public class VirtualSystemEntry implements IsSerializable {

    @Id
    @Column(name = "vseID")
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Extension(vendorName = "datanucleus", key = "gae.encoded-pk", value = "true")
    private String id;
    String label, image, tooltip;


    private int x, y, tray;

    @OneToOne(mappedBy="vse")
    Folder parent = new Folder();
    }

异常跟踪的片段

INTERNAL_SERVER_ERROR</pre></p><h3>Caused by:</h3><pre>java.lang.StackOverflowError
    at java.util.Hashtable.get(Hashtable.java:334)
    at java.util.Properties.getProperty(Properties.java:932)
    at java.lang.System.getProperty(System.java:653)
    at com.google.appengine.tools.development.agent.runtime.Runtime.checkRestricted(Runtime.java:63)
    at com.cbd.shared.entities.VirtualSystemEntry.&lt;init&gt;(VirtualSystemEntry.java:28)
    at com.cbd.shared.entities.Folder.&lt;init&gt;(Folder.java:27)
    at com.cbd.shared.entities.VirtualSystemEntry.&lt;init&gt;(VirtualSystemEntry.java:28)
    at com.cbd.shared.entities.Folder.&lt;init&gt;(Folder.java:27)
    at com.cbd.shared.entities.VirtualSystemEntry.&lt;init&gt;(VirtualSystemEntry.java:28)
    at com.cbd.shared.entities.Folder.&lt;init&gt;(Folder.java:27)
    at com.cbd.shared.entities.VirtualSystemEntry.&lt;init&gt;(VirtualSystemEntry.java:28)
    at com.cbd.shared.entities.Folder..... and so on

那么我到底做错了什么？？顺便说一下，我使用的是GWT

Answer 1

因此，您的代码virtualsystemmentry（构造函数）正在调用您的代码文件夹（构造函数），它会递归（您不提供这些方法的代码），很可能是这些类变量“parent”和“vse”的初始化。。。修正初始化；-）