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我正在尝试编写一个小型应用程序以在本地H2数据库上使用DataNucleus的JDO实现。我首先删除任何现有的H2数据库，并用简单的连接重新创建它。JDOFatalUserException：持久性管理器已关闭
但是，我得到一个JDOFatalUserException: Persistence Manager has been closed错误，我不知道为什么。这发生在我进行第一次调用PM（在FeedDatabaseFR.java:59）：
Transaction tx=DataNucleus.PM.currentTransaction();
这里是输出我得到：
C:/Temp/FWDB/
jdbc:h2:file:C:/Temp/FWDB/FWDB;MODE=MySQL
Connection retrieved
Connection closed
Creating PersistenceManagerFactory
01-mars-2012 17:30:42 org.datanucleus.store.rdbms.table.AbstractTable create
INFO: Creating table DELETEME1330619442915
01-mars-2012 17:30:42 org.datanucleus.store.rdbms.table.AbstractTable drop
INFO: Dropping table DELETEME1330619442915
01-mars-2012 17:30:42 org.datanucleus.store.rdbms.RDBMSStoreManager initialiseSchema
INFO: Initialising Catalog "fwdb", Schema "public" using "None" auto-start option
01-mars-2012 17:30:42 org.datanucleus.store.rdbms.RDBMSStoreManager initialiseSchema
INFO: Catalog "fwdb", Schema "public" initialised - managing 0 classes
01-mars-2012 17:30:42 org.datanucleus.NucleusContext logConfiguration
INFO: ================= Persistence Configuration ===============
01-mars-2012 17:30:42 org.datanucleus.NucleusContext logConfiguration
INFO: DataNucleus Persistence Factory - Vendor: "DataNucleus" Version: "3.0.0.release"
01-mars-2012 17:30:42 org.datanucleus.NucleusContext logConfiguration
INFO: DataNucleus Persistence Factory initialised for datastore URL="jdbc:h2:file:C:/Temp/FWDB/FWDB;MODE=MySQL" driver="org.h2.Driver" userName="sa"
01-mars-2012 17:30:42 org.datanucleus.NucleusContext logConfiguration
INFO: ===========================================================
PersistenceManagerFactory is not null
Creating PersistenceManager
01-mars-2012 17:30:42 org.datanucleus.api.jdo.metadata.JDOMetaDataManager <init>
INFO: Registering listener for metadata initialisation
PersistenceManager is not null
01-mars-2012 17:30:43 org.datanucleus.api.jdo.metadata.JDOMetaDataManager$MetaDataRegisterClassListener registerClass
INFO: Listener found initialisation for persistable class net.dwst.findword.DataNucleus.RawBeginItem
01-mars-2012 17:30:43 org.datanucleus.api.jdo.metadata.JDOAnnotationReader processClassAnnotations
INFO: Class "net.dwst.findword.DataNucleus.RawBeginItem" has been specified with JDO annotations so using those.
01-mars-2012 17:30:43 org.datanucleus.store.StoreDataManager registerStoreData
INFO: Managing Persistence of Class : net.dwst.findword.DataNucleus.RawBeginItem [Table : RAWBEGINITEM, InheritanceStrategy : new-table]
01-mars-2012 17:30:43 org.datanucleus.store.rdbms.table.AbstractTable create
INFO: Creating table RAWBEGINITEM
01-mars-2012 17:30:43 org.datanucleus.api.jdo.metadata.JDOMetaDataManager$MetaDataRegisterClassListener registerClass
INFO: Listener found initialisation for persistable class net.dwst.findword.DataNucleus.RawEndItem
01-mars-2012 17:30:43 org.datanucleus.api.jdo.metadata.JDOAnnotationReader processClassAnnotations
INFO: Class "net.dwst.findword.DataNucleus.RawEndItem" has been specified with JDO annotations so using those.
01-mars-2012 17:30:43 org.datanucleus.store.StoreDataManager registerStoreData
INFO: Managing Persistence of Class : net.dwst.findword.DataNucleus.RawEndItem [Table : RAWENDITEM, InheritanceStrategy : new-table]
01-mars-2012 17:30:43 org.datanucleus.store.rdbms.table.AbstractTable create
INFO: Creating table RAWENDITEM
01-mars-2012 17:30:43 org.datanucleus.api.jdo.metadata.JDOMetaDataManager$MetaDataRegisterClassListener registerClass
INFO: Listener found initialisation for persistable class net.dwst.findword.DataNucleus.RawContainItem
01-mars-2012 17:30:43 org.datanucleus.api.jdo.metadata.JDOAnnotationReader processClassAnnotations
INFO: Class "net.dwst.findword.DataNucleus.RawContainItem" has been specified with JDO annotations so using those.
01-mars-2012 17:30:43 org.datanucleus.store.StoreDataManager registerStoreData
INFO: Managing Persistence of Class : net.dwst.findword.DataNucleus.RawContainItem [Table : RAWCONTAINITEM, InheritanceStrategy : new-table]
01-mars-2012 17:30:43 org.datanucleus.store.rdbms.table.AbstractTable create
INFO: Creating table RAWCONTAINITEM
01-mars-2012 17:30:43 org.datanucleus.api.jdo.metadata.JDOMetaDataManager$MetaDataRegisterClassListener registerClass
INFO: Listener found initialisation for persistable class net.dwst.findword.DataNucleus.RawMadeOfItem
01-mars-2012 17:30:43 org.datanucleus.api.jdo.metadata.JDOAnnotationReader processClassAnnotations
INFO: Class "net.dwst.findword.DataNucleus.RawMadeOfItem" has been specified with JDO annotations so using those.
01-mars-2012 17:30:43 org.datanucleus.store.StoreDataManager registerStoreData
INFO: Managing Persistence of Class : net.dwst.findword.DataNucleus.RawMadeOfItem [Table : RAWMADEOFITEM, InheritanceStrategy : new-table]
01-mars-2012 17:30:43 org.datanucleus.store.rdbms.table.AbstractTable create
INFO: Creating table RAWMADEOFITEM
Exception in thread "main" javax.jdo.JDOFatalUserException: Persistence Manager has been closed
at org.datanucleus.api.jdo.JDOPersistenceManager.assertIsOpen(JDOPersistenceManager.java:2193)
at org.datanucleus.api.jdo.JDOPersistenceManager.currentTransaction(JDOPersistenceManager.java:383)
at net.dwst.findword.FR.FeedDatabaseFR.main(FeedDatabaseFR.java:59)
我绝对不知道为什么出现这种情况！任何人都有线索？任何人有想法建议？欢迎任何帮助！谢谢。