GAE发布java工程遇到的JDO问题

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GAE发布java工程遇到的JDO问题5

本来想提问到java区的，但是这个是GAE的问题，而GAE又在python区下面，就这样先提问吧，管理员不要换了啊。谢谢。。

创建一个java的GAE工程的时候，出现了提示说
You have either specified for this PMF to
use a "persistence-unit" of "transactions-optional" (yet this doesnt
exist!) or you called JDOHelper.getPersistenceManagerFactory with
"transactions-optional" as the name of a properties file (and this
doesnt exist in the CLASSPATH)，到底要把哪个放到class下面呢？？查找了很久不得其解。。。。
下面的详细的代码中的片段，几乎和官网上面的demo介绍的一模一样。。。怎么回事？

_____________________________________________________________________________
<?xml version="1.0" encoding="utf-8"?>
<jdoconfig xmlns="http://java.sun.com/xml/ns/jdo/jdoconfig";
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
xsi:noNamespaceSchemaLocation="http://java.sun.com/xml/ns/jdo/
jdoconfig">

<persistence-manager-factory name="transactions-optional">
<property name="javax.jdo.PersistenceManagerFactoryClass"

value="org.datanucleus.store.appengine.jdo.DatastoreJDOPersistenceManagerFactory"/

<property name="javax.jdo.option.ConnectionURL"
value="appengine"/>
<property name="javax.jdo.option.NontransactionalRead"
value="true"/>
<property name="javax.jdo.option.NontransactionalWrite"
value="true"/>
<property name="javax.jdo.option.RetainValues" value="true"/>
<property name="datanucleus.appengine.autoCreateDatastoreTxns"
value="true"/>
</persistence-manager-factory>
</jdoconfig>

------------------------------------------------------------------------------------------------------------------------------------------

import javax.jdo.JDOHelper;
import javax.jdo.PersistenceManagerFactory;

public final class PMF {
private static final PersistenceManagerFactory pmfInstance =
JDOHelper.getPersistenceManagerFactory("transactions-
optional");

private PMF() {}

public static PersistenceManagerFactory get() {
return pmfInstance;
}
}

------------------------------------------------------------------------------------------------------------------------------------------

javax.jdo.JDOUserException: You have either specified for this PMF to
use a "persistence-unit" of "transactions-optional" (yet this doesnt
exist!) or you called JDOHelper.getPersistenceManagerFactory with
"transactions-optional" as the name of a properties file (and this
doesnt exist in the CLASSPATH)
at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:
856)
at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:
1092)
at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:
914)
at com.cards.services.PMF.<clinit>(PMF.java:8)
... 44 more
Caused by: javax.jdo.JDOUserException: You have either specified for
this PMF to use a "persistence-unit" of "transactions-optional" (yet
this doesnt exist!) or you called
JDOHelper.getPersistenceManagerFactory with "transactions-optional" as
the name of a properties file (and this doesnt exist in the CLASSPATH)
at
org.datanucleus.jdo.JDOPersistenceManagerFactory.initialiseProperties(JDOPersistenceManagerFactory.java:
377)
at
org.datanucleus.jdo.JDOPersistenceManagerFactory.<init>(JDOPersistenceManagerFactory.java:
260)
at
org.datanucleus.jdo.JDOPersistenceManagerFactory.getPersistenceManagerFactory(JDOPersistenceManagerFactory.java:
173)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:
39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
at java.lang.reflect.Method.invoke(Method.java:592)
at
com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:
100)
at javax.jdo.JDOHelper$16.run(JDOHelper.java:1956)
at java.security.AccessController.doPrivileged(Native Method)
at javax.jdo.JDOHelper.invoke(JDOHelper.java:1951)
at
javax.jdo.JDOHelper.invokeGetPersistenceManagerFactoryOnImplementation(JDOHelper.java:
1159)
at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:
839)
... 47 more
Feb 8, 2010 10:29:16 AM com.google.apphosting.utils.jetty.JettyLogger
warn
WARNING: Nested in java.lang.ExceptionInInitializerError:
javax.jdo.JDOFatalUserException: A property named
javax.jdo.PersistenceManagerFactoryClass must be specified, or a jar
file with a META-INF/services/javax.jdo.PersistenceManagerFactory
entry must be in the classpath, or a property named
javax.jdo.option.PersistenceUnitName must be specified.
at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:
856)
at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:
1092)
at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:
914)
at com.cards.services.PMF.<clinit>(PMF.java:8)
at com.cards.services.UserService$Impl.create(UserService.java:42)
at
com.cards.spring.controllers.UserController.getUser(UserController.java:
54)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:
39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
25)
at java.lang.reflect.Method.invoke(Method.java:592)