我在[https://github.com/firekat/play-kundera]（https://github.com/firekat/play-kundera）上尝试了kundera cassandra而不是java play framework 2.0.4示例。
我得到例外..异常堆栈跟踪
2013-02-03 22:56:35,201 - [ERROR] - from com.impetus.kundera.persistence.PersistenceValidator in play-akka.actor.actions-dispatcher-9
class models.User is not a JPA managed object as we couldn't find metadata for it. This object can't be persisted
2013-02-03 22:56:35,230 - [ERROR] - from application in play-akka.actor.actions-dispatcher-9
! @6d86e1m37 - Internal server error, for request [GET /user/create/:Emin] ->
play.core.ActionInvoker$$anonfun$receive$1$$anon$1: Execution exception [[KunderaException: java.lang.IllegalArgumentException: Entity object is invalid, operation failed. Please check previous log message for details]]
at play.core.ActionInvoker$$anonfun$receive$1.apply(Invoker.scala:134) [play_2.9.1.jar:2.0.4]
at play.core.ActionInvoker$$anonfun$receive$1.apply(Invoker.scala:115) [play_2.9.1.jar:2.0.4]
at akka.actor.Actor$class.apply(Actor.scala:318) [akka-actor.jar:2.0.2]
at play.core.ActionInvoker.apply(Invoker.scala:113) [play_2.9.1.jar:2.0.4]
at akka.actor.ActorCell.invoke(ActorCell.scala:626) [akka-actor.jar:2.0.2]
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:197) [akka-actor.jar:2.0.2]
at akka.dispatch.Mailbox.run(Mailbox.scala:179) [akka-actor.jar:2.0.2]
at akka.dispatch.ForkJoinExecutorConfigurator$MailboxExecutionTask.exec(AbstractDispatcher.scala:516) [akka-actor.jar:2.0.2]
at akka.jsr166y.ForkJoinTask.doExec(ForkJoinTask.java:259) [akka-actor.jar:2.0.2]
at akka.jsr166y.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:975) [akka-actor.jar:2.0.2]
at akka.jsr166y.ForkJoinPool.runWorker(ForkJoinPool.java:1479) [akka-actor.jar:2.0.2]
at akka.jsr166y.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:104) [akka-actor.jar:2.0.2]
Caused by: com.impetus.kundera.KunderaException: java.lang.IllegalArgumentException: Entity object is invalid, operation failed. Please check previous log message for details
at com.impetus.kundera.persistence.EntityManagerImpl.persist(EntityManagerImpl.java:220) ~[kundera-core-2.3.jar:na]
at controllers.KunderaApp.createUser(KunderaApp.java:26) ~[classes/:na]
at Routes$$anonfun$routes$1$$anonfun$apply$5$$anonfun$apply$6.apply(routes_routing.scala:56) ~[classes/:na]
at Routes$$anonfun$routes$1$$anonfun$apply$5$$anonfun$apply$6.apply(routes_routing.scala:56) ~[classes/:na]
at play.core.Router$HandlerInvoker$$anon$5$$anon$1.invocation(Router.scala:1090) ~[play_2.9.1.jar:2.0.4]
at play.core.j.JavaAction$$anon$1.call(JavaAction.scala:33) ~[play_2.9.1.jar:2.0.4]
at play.db.jpa.TransactionalAction$1.apply(TransactionalAction.java:19) ~[play_2.9.1.jar:2.0.4]
at play.db.jpa.TransactionalAction$1.apply(TransactionalAction.java:17) ~[play_2.9.1.jar:2.0.4]
at play.db.jpa.JPA.withTransaction(JPA.java:104) ~[play_2.9.1.jar:2.0.4]
at play.db.jpa.TransactionalAction.call(TransactionalAction.java:14) ~[play_2.9.1.jar:2.0.4]
at play.core.j.JavaAction$class.apply(JavaAction.scala:74) ~[play_2.9.1.jar:2.0.4]
at play.core.Router$HandlerInvoker$$anon$5$$anon$1.apply(Router.scala:1089) ~[play_2.9.1.jar:2.0.4]
at play.core.ActionInvoker$$anonfun$receive$1$$anonfun$6.apply(Invoker.scala:126) ~[play_2.9.1.jar:2.0.4]
at play.core.ActionInvoker$$anonfun$receive$1$$anonfun$6.apply(Invoker.scala:126) ~[play_2.9.1.jar:2.0.4]
at play.utils.Threads$.withContextClassLoader(Threads.scala:17) ~[play_2.9.1.jar:2.0.4]
at play.core.ActionInvoker$$anonfun$receive$1.apply(Invoker.scala:125) [play_2.9.1.jar:2.0.4]
... 11 common frames omitted
Caused by: java.lang.IllegalArgumentException: Entity object is invalid, operation failed. Please check previous log message for details
at com.impetus.kundera.persistence.PersistenceDelegator.persist(PersistenceDelegator.java:146) ~[kundera-core-2.3.jar:na]
at com.impetus.kundera.persistence.EntityManagerImpl.persist(EntityManagerImpl.java:214) ~[kundera-core-2.3.jar:na]
... 26 common frames omitted您可能认为我创建了我的键空间和列族。这就是我在cassandra -cli中所做的，我检查它是否有效，我可以通过-cli确认数据<{3}}
答案 0 :(得分：1)
根据错误：
play.core.ActionInvoker $$ anonfun $ receive $ 1 $$ anon $ 1：执行异常[[PersistenceLoaderException：com.impetus.kundera.utils.InvalidConfigurationException：名称的重复持久性单位：cassandra_pu。验证你的persistence.xml文件]] at play.core.ActionInvoker $$ anonfun $ receive $ 1.apply（Invoker.scala：82）[play_2.9.1.jar：2.0] 在play.core.ActionInvoker $$ anonfun $ receive $ 1.apply（Invoker.scala：63）[play_2.9.1.jar：2.0] at akka.actor.Actor $ class.apply（Actor.scala：290）[akka-actor.jar：2.0] at play.core.ActionInvoker.apply（Invoker.scala：61）[play_2.9.1.jar：2.0] at akka.actor.ActorCell.invoke（ActorCell.scala：617）[akka-actor.jar：2.0] at akka.dispatch.Mailbox.processMailbox（Mailbox.scala：179）[akka-actor.jar：2.0] at akka.dispatch.Mailbox.run（Mailbox.scala：161）[akka-actor.jar：2.0] at akka.dispatch.ForkJoinExecutorConfigurator $ MailboxExecutionTask.exec（AbstractDispatcher.scala：505）[akka-actor.jar：2.0] at akka.jsr166y.ForkJoinTask.doExec（ForkJoinTask.java:259）[akka-actor.jar：2.0] at akka.jsr166y.ForkJoinPool $ WorkQueue.runTask（ForkJoinPool.java:997）[akka-actor.jar：2.0] at akka.jsr166y.ForkJoinPool.runWorker（ForkJoinPool.java:1495）[akka-actor.jar：2.0] at akka.jsr166y.ForkJoinWorkerThread.run（ForkJoinWorkerThread.java:104）[akka-actor.jar：2.0] 引起：com.impetus.kundera.loader.PersistenceLoaderException：com.impetus.kundera.utils.InvalidConfigurationException：名称的重复持久性单位：cassandra_pu。验证您的persistence.xml文件 在com.impetus.kundera.configure.PersistenceUnitConfiguration.configure（PersistenceUnitConfiguration.java:103）〜[kundera-cassandra-2.2.1-jar-with-dependencies.jar：na] 在com.impetus.kundera.configure.Configurator.configure（Configurator.java:64）〜[kundera-cassandra-2.2.1-jar-with-dependencies.jar：na] 在com.impetus.kundera.KunderaPersistence.initializeKundera（KunderaPersistence.java:103）〜[kundera-cassandra-2.2.1-jar-with-dependencies.jar：na] 在com.impetus.kundera.KunderaPersistence.createEntityManagerFactory（KunderaPersistence.java:81）〜[kundera-cassandra-2.2.1-jar-with-dependencies.jar：na] 在javax.persistence.Persistence.createEntityManagerFactory（未知来源）〜[kundera-cassandra-2.2.1-jar-with-dependencies.jar：na] 在javax.persistence.Persistence.createEntityManagerFactory（未知来源）〜[kundera-cassandra-2.2.1-jar-with-dependencies.jar：na]
=================================== 我建议你在（META-INF / persistence.xml）下更改持久性单元名称并尝试运行它。
-Vivek