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如何在GAE上为grails应用程序设置一对多单向映射？

[英]How to setup one-to-many unidirectional mapping for grails application on GAE?

 原文  2009-09-04 03:31:42  7   2    google-app-engine/ grails/ jpa/ gorm

问题描述

I try to perform testing on one-to-many unidirectional mapping for grails application on google app engine (GAE) using JPA. 我尝试使用JPA在Google App Engine（GAE）上的grails应用程序的一对多单向映射上执行测试。 The one-to-many unidirectional mapping I attempt to define is between User and Role class. 我尝试定义的一对多单向映射是在User和Role类之间。 Unfortunately, I am stuck. 不幸的是，我被困住了。 Just curious is there any developer out there able to make it work successfully. 奇怪的是，有没有开发人员能够使其成功工作。

Following is my development environment: 以下是我的开发环境：

  • Windows XP Professional Windows XP专业版
  • App Engine SDK 1.2.2 App Engine SDK 1.2.2
  • Grails 1.1.1 Grails 1.1.1
  • Plugins used: app-engine 0.8.3, gorm-jpa 0.5 使用的插件：app引擎0.8.3，gorm-jpa 0.5

The source code located at: 源代码位于：

The complete errors stack trace is here: 完整的错误堆栈跟踪在这里： 

 [java] Sep 4, 2009 2:08:42 AM com.google.apphosting.utils.jetty.JettyLogger warn
 [java] WARNING: Failed startup of context com.google.apphosting.utils.jetty.DevAppEngineWebAppContext@1ebd75b{/,C:\Documents and Settings\limcheekin\.grails\1.1.1\projects\one2many\stage}
 [java] org.springframework.beans.factory.access.BootstrapException: Error executing bootstraps; nested exception is org.codehaus.groovy.runtime.InvokerInvocationException: org.springframework.orm.jpa.JpaSystemException: Class "com.vobject.grailsfuse.User" has collection field "roles" and this has no mapping in the table for the element class "com.vobject.grailsfuse.Role"; nested exception is javax.persistence.PersistenceException: Class "com.vobject.grailsfuse.User" has collection field "roles" and this has no mapping in the table for the element class "com.vobject.grailsfuse.Role"
 [java]     at org.codehaus.groovy.grails.web.context.GrailsContextLoader.createWebApplicationContext(GrailsContextLoader.java:74)
 [java]     at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:199)
 [java]     at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:45)
 [java]     at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:530)
 [java]     at org.mortbay.jetty.servlet.Context.startContext(Context.java:135)
 [java]     at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1218)
 [java]     at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:500)
 [java]     at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448)
 [java]     at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)
 [java]     at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:117)
 [java]     at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)
 [java]     at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:117)
 [java]     at org.mortbay.jetty.Server.doStart(Server.java:217)
 [java]     at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:40)
 [java]     at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:152)
 [java]     at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:116)
 [java]     at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:218)
 [java]     at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:162)
 [java]     at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48)
 [java]     at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServerMain.java:113)
 [java]     at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:89)
 [java] Caused by: org.codehaus.groovy.runtime.InvokerInvocationException: org.springframework.orm.jpa.JpaSystemException: Class "com.vobject.grailsfuse.User" has collection field "roles" and this has no mapping in the table for the element class "com.vobject.grailsfuse.Role"; nested exception is javax.persistence. PersistenceException: Class "com.vobject.grailsfuse.User" has collection field "roles" and this has no mapping in the table for the element class "com.vobject.grailsfuse.Role"
 [java]     ... 7 more
 [java] Caused by: org.springframework.orm.jpa.JpaSystemException: Class "com.vobject.grailsfuse.User" has collection field "roles" and this has no mapping in the table for the element class "com.vobject.grailsfuse.Role"; nested exception is javax.persistence.PersistenceException: Class "com.vobject.grailsfuse.User" has collection field "roles" and this has no mapping in the table for the element class "com.vobject.grailsfuse.Role"
 [java]     at org.grails.jpa.JpaPluginSupport$__clinit__closure3_closure6_closure11_closure38.doCall(JpaPluginSupport.groovy:452)
 [java]     at BootStrap$_closure1.doCall(BootStrap.groovy:13)
 [java]     ... 7 more
 [java] Caused by: javax.persistence.PersistenceException: Class "com.vobject.grailsfuse.User" has collection field "roles" and this has no mapping in the table for the element class "com.vobject.grailsfuse.Role"
 [java]     at org.datanucleus.jpa.NucleusJPAHelper.getJPAExceptionForNucleusException(NucleusJPAHelper.java:264)
 [java]     at org.datanucleus.jpa.EntityTransactionImpl.commit(EntityTransactionImpl.java:122)
 [java]     ... 9 more
 [java] Caused by: org.datanucleus.exceptions.NucleusUserException: Class "com.vobject.grailsfuse.User" has collection field "roles" and this has no mapping in the table for the element class "com.vobject.grailsfuse.Role"
 [java]     at org.datanucleus.store.mapped.scostore.FKSetStore.<init>(FKSetStore.java:184)
 [java]     at org.datanucleus.store.appengine.DatastoreFKSetStore.<init>(DatastoreFKSetStore.java:38)
 [java]     at org.datanucleus.store.appengine.DatastoreManager.newFKSetStore(DatastoreManager.java:353)
 [java]     at org.datanucleus.store.mapped.MappedStoreManager.getBackingStoreForCollection(MappedStoreManager.java:734)
 [java]     at org.datanucleus.store.mapped.MappedStoreManager.getBackingStoreForField(MappedStoreManager.java:646)
 [java]     at org.datanucleus.sco.backed.HashSet.<init>(HashSet.java:102)
 [java]     at org.datanucleus.util.ClassUtils.newInstance(ClassUtils.java:94)
 [java]     at org.datanucleus.sco.SCOUtils.newSCOInstance(SCOUtils.java:164)
 [java]     at org.datanucleus.state.JDOStateManagerImpl.wrapSCOField(JDOStateManagerImpl.java:3040)
 [java]     at org.datanucleus.store.fieldmanager.LoadFieldManager.internalFetchObjectField(LoadFieldManager.java:92)
 [java]     at org.datanucleus.store.fieldmanager.AbstractFetchFieldManager.fetchObjectField(AbstractFetchFieldManager.java:104)
 [java]     at org.datanucleus.state.AbstractStateManager.replacingObjectField(AbstractStateManager.java:1197)
 [java]     at com.vobject.grailsfuse.User.jdoReplaceField(User.groovy)
 [java]     at com.vobject.grailsfuse.User.jdoReplaceFields(User.groovy)
 [java]     at org.datanucleus.state.JDOStateManagerImpl.replaceFields(JDOStateManagerImpl.java:2772)
 [java]     at org.datanucleus.state.JDOStateManagerImpl.replaceFields(JDOStateManagerImpl.java:2791)
 [java]     at org.datanucleus.state.JDOStateManagerImpl.loadFieldsInFetchPlan(JDOStateManagerImpl.java:1610)
 [java]     at org.datanucleus.ObjectManagerImpl.performDetachAllOnCommitPreparation(ObjectManagerImpl.java:3192)
 [java]     at org.datanucleus.ObjectManagerImpl.preCommit(ObjectManagerImpl.java:2931)
 [java]     at org.datanucleus.TransactionImpl.internalPreCommit(TransactionImpl.java:369)
 [java]     at org.datanucleus.TransactionImpl.commit(TransactionImpl.java:256)
 [java]     at org.datanucleus.jpa.EntityTransactionImpl.commit(EntityTransactionImpl.java:104)
 [java]     ... 9 more
 [java] Sep 4, 2009 2:08:42 AM com.google.apphosting.utils.jetty.JettyLogger warn
 [java] WARNING: Nested in org.springframework.beans.factory.access.BootstrapException: Error executing bootstraps; nested exception is org.codehaus.groovy.runtime.InvokerInvocationException: org.springframework.orm.jpa.JpaSystemException: Class "com.vobject.grailsfuse.User" has collection field "roles" and this has no mapping in the table for the element class "com.vobject.grailsfuse.Role"; nested exception is javax.persistence.PersistenceException: Class "com.vobject.grailsfuse.User" has collection field "roles" and this has no mapping in the table for the element class "com.vobject.grailsfuse.Role":
 [java] Class "com.vobject.grailsfuse.User" has collection field "roles" and this has no mapping in the table for the element class "com.vobject.grailsfuse.Role"
 [java] org.datanucleus.exceptions.NucleusUserException: Class "com.vobject.grailsfuse.User" has collection field "roles" and this has no mapping in the table for the element class "com.vobject.grailsfuse.Role"
 [java]     at org.datanucleus.store.mapped.scostore.FKSetStore.<init>(FKSetStore.java:184)
 [java]     at org.datanucleus.store.appengine.DatastoreFKSetStore.<init>(DatastoreFKSetStore.java:38)
 [java]     at org.datanucleus.store.appengine.DatastoreManager.newFKSetStore(DatastoreManager.java:353)
 [java]     at org.datanucleus.store.mapped.MappedStoreManager.getBackingStoreForCollection(MappedStoreManager.java:734)
 [java]     at org.datanucleus.store.mapped.MappedStoreManager.getBackingStoreForField(MappedStoreManager.java:646)
 [java]     at org.datanucleus.sco.backed.HashSet.<init>(HashSet.java:102)
 [java]     at org.datanucleus.util.ClassUtils.newInstance(ClassUtils.java:94)
 [java]     at org.datanucleus.sco.SCOUtils.newSCOInstance(SCOUtils.java:164)
 [java]     at org.datanucleus.state.JDOStateManagerImpl.wrapSCOField(JDOStateManagerImpl.java:3040)
 [java]     at org.datanucleus.store.fieldmanager.LoadFieldManager.internalFetchObjectField(LoadFieldManager.java:92)
 [java]     at org.datanucleus.store.fieldmanager.AbstractFetchFieldManager.fetchObjectField(AbstractFetchFieldManager.java:104)
 [java]     at org.datanucleus.state.AbstractStateManager.replacingObjectField(AbstractStateManager.java:1197)
 [java]     at com.vobject.grailsfuse.User.jdoReplaceField(User.groovy)
 [java]     at com.vobject.grailsfuse.User.jdoReplaceFields(User.groovy)
 [java]     at org.datanucleus.state.JDOStateManagerImpl.replaceFields(JDOStateManagerImpl.java:2772)
 [java]     at org.datanucleus.state.JDOStateManagerImpl.replaceFields(JDOStateManagerImpl.java:2791)
 [java]     at org.datanucleus.state.JDOStateManagerImpl.loadFieldsInFetchPlan(JDOStateManagerImpl.java:1610)
 [java]     at org.datanucleus.ObjectManagerImpl.performDetachAllOnCommitPreparation(ObjectManagerImpl.java:3192)
 [java]     at org.datanucleus.ObjectManagerImpl.preCommit(ObjectManagerImpl.java:2931)
 [java]     at org.datanucleus.TransactionImpl.internalPreCommit(TransactionImpl.java:369)
 [java]     at org.datanucleus.TransactionImpl.commit(TransactionImpl.java:256)
 [java]     at org.datanucleus.jpa.EntityTransactionImpl.commit(EntityTransactionImpl.java:104)
 [java]     at org.grails.jpa.JpaPluginSupport$__clinit__closure3_closure6_closure11_closure38.doCall(JpaPluginSupport.groovy:452)
 [java]     at BootStrap$_closure1.doCall(BootStrap.groovy:13)
 [java]     at com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:152)
 [java]     at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:116)
 [java]     at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:218)
 [java]     at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:162)
 [java]     at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48)
 [java]     at com.google.appengine.tools.development.DevAppServerMain.<init>(DevAppServerMain.java:113)
 [java]     at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:89)

Please advice. 请指教。 See whether you have any idea on what went wrong… 看看您对出什么问题有任何想法...

Thanks. 谢谢。

2 个解决方案

解决方案1
 1  2009-11-30 03:26:21

For the update, I released appengine-gorm plugin to grails plugin repository, the motivation I wrote this plugin to support batch insert operation. 对于更新，我将appengine-gorm插件发布到grails插件存储库，这是我编写该插件以支持批量插入操作的动机。 As I am unable to make the one-to-many relationship by using annotation (@OneToMany) working in Google App Engine after so many attempts, I decided to manage the relationship manually instead of using the mapping. 经过多次尝试后，由于无法使用在Google App Engine中运行的注释（@OneToMany）建立一对多关系，因此我决定手动管理该关系，而不使用映射。 However, while I attempt to save the objects in the many side of the one-to-many relationship, I am facing request timeout of google app engine. 但是，当我尝试在一对多关系的许多方面保存对象时，我面临着Google App Engine请求超时的问题。 Then, I find out that the low level API of datastore support persist many objects in one API call, so there is the born of this plugin. 然后，我发现数据存储支持的低级API在一个API调用中保留了许多对象，因此该插件诞生了。 Hopefully, it is benefit you and others. 希望对您和其他人有益。

Lastly, I managed make the one-to-many relationship working manually and without the mapping. 最后，我设法使一对多关系手动工作并且没有映射。 Please look at live demo app called GrailsFuse at http://grailsfuse.vobject.com/ . 请在http://grailsfuse.vobject.com/上观看名为GrailsFuse的实时演示应用程序。

I welcome your feedback and comments. 我欢迎您的反馈和意见。 Please feel free to drop me an email at limcheekin at vobject dot com. 请随时通过limcheekin vobject dot com给我发送电子邮件。

Thanks. 谢谢。

解决方案2
 0  

Looks like the problem is that you don't have a User on the Role since you'll need to specify the mappedBy on the collection I think. 看起来问题在于您在角色上没有用户，因为您需要在我认为的集合上指定maptedBy。 

@OneToMany(mappedBy="user",fetch=FetchType.EAGER)
Set<Role> roles

Also you don't really need the join table stuff since you aren't really working with tables in app-engine. 另外，由于您并不是真正在应用程序引擎中使用表，因此您实际上并不需要连接表的内容。 In essence the role will exist under the user entity. 本质上，该角色将存在于用户实体下。

Hope that helps :) 希望有帮助:)

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