GAE / J数据存储Presistent Jdo删除问题

时间：2013-01-02 07:41:51

标签： java google-app-engine google-cloud-datastore jdo datanucleus

目前我的父类看起来像这样，

public class UserVotesJDO {

@PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    private Key key;

    @Persistent
    private String mediaId;

    @Persistent(dependent="true")
    private LikesJDO likes;

    @Persistent(dependent="true")
    private HatesJDO hates;

//使用getter和setter以及其他变量     }

和我的Child类hatesJDO看起来像

@PersistenceCapable(detachable = "true")
public class HatesJDO {

@PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    private Key key;

@Persistent
private int count;

private List<UserJDO> hatesUsersList;
}

其中UserJDO是另一个子类，如下所示，

@PersistenceCapable(detachable="true")
public class UserJDO {

@PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    private Key key;

@Persistent
private String userId;

@Persistent
private String userName;

@Persistent
private String fullName;

@Persistent
private String userEmail;
}

我的逻辑是，当我删除UserVote时，我不再需要那些依赖孩子的仇恨和喜欢，以及它的UserJDO 所以当我尝试删除UserVotesJDO对象时，我在控制台中收到如下警告 

Delete of com.shoewars.jdo.UserVotesJDO@8b4163 needs delete of related object at com.shoewars.jdo.ShoeWarsUserVotesJDO.hates but cannot delete it direct since FK is here

我得到这一点外键是当前引用或使用的.....

任何人都可以帮我解决这个问题！

由于这是我的第一篇文章，我不知道如何正确发布，无论如何，我会解释我正在尝试做什么

我有一个JDO，它存储了一个图像ID，以及那些喜欢这个图像的人的信息以及那些讨厌这个图像的人

为此目的，我创建了两个JDO likesJDO和HatesJDO，分别存储列表。

所以，当我在jdo中保存有关投票的信息时，会发生以下事情

  1. 获取用户信息并将其相应地存储在不喜欢或喜欢的用户列表中

  2. 将这些添加到UserVote JDO以及图像ID

  3. 最后坚持下去

    4. 现在，我的问题是，当我删除UserVote JDO时，我希望删除hatesJDO和likesJDO中的那些记录，以便我添加

    @Persistent(dependent="true")
private LikesJDO likes;

@Persistent(dependent="true")
private HatesJDO hates;

    这些行

    但是现在，这样做会出现异常

    堆栈跟踪就像：

    com.uservote.service.UserVotesOperations updateUserVoteForMedia: Cannot read fields from a deleted object
javax.jdo.JDOUserException: Cannot read fields from a deleted object
FailedObject:com.google.appengine.api.datastore.Key:UserVotesJDO(80003)/LikesJDO(1)/UserJDO(2001)
    at org.datanucleus.api.jdo.state.PersistentDeleted.transitionReadField(PersistentDeleted.java:116)
    at org.datanucleus.state.AbstractStateManager.transitionReadField(AbstractStateManager.java:838)
    at org.datanucleus.state.JDOStateManager.isLoaded(JDOStateManager.java:1699)
    at com.uservotes.jdo.UserJDO.jdoGetuserId(UserJDO.java)
    at com.uservotes.jdo.UserJDO.getUserDTO(UserJDO.java:157)
    at com.uservotes.service.InstagramApiService.convertToUserDtoList(InstagramApiService.java:555)
    at com.uservotes.jdo.LikesJDO.getLikesDTO(LikesJDO.java:95)
    at com.uservotes.jdo.uservotesUserVotesJDO.getuservotesUserVotesDTO(uservotesUserVotesJDO.java:109)
    at com.uservotes.service.UserVotesOperations.updateUserVoteForMedia(UserVotesOperations.java:242)
    at com.uservotes.service.UserVotesOperations.updateUserVoteForMediaList(UserVotesOperations.java:162)
    at com.uservotes.controller.UserVotesController.hanldeUpdateUserVotesRequest(UserVotesController.java:111)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_$1.run(Method_.java:165)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.privilegedInvoke(Method_.java:163)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke_(Method_.java:124)
    at com.google.apphosting.runtime.security.shared.intercept.java.lang.reflect.Method_.invoke(Method_.java:43)
    at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:213)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:126)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:96)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:617)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:578)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:80)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
    at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:102)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:266)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
    at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:146)
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:447)
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:454)
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:461)
    at com.google.tracing.TraceContext.runInContext(TraceContext.java:703)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:338)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:330)
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:458)
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251)
    at java.lang.Thread.run(Thread.java:679)

1 个答案:

答案 0 :(得分：0)

似乎与Lazy Load相关的东西。尝试访问like＆amp;在删除之前讨厌（通过getLikes（）＆amp; getHates（））。

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