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我将 Google App Engine (appengine-java-sdk-1.6.6) 用于使用 JDO 和 maven (maven-gae-plugin) 用于项目结构和构建的应用程序。构建成功并使用 DataNucleus Enhancer 增强了我的域类。

运行应用程序时，我遇到了这个问题：Class org.datanucleus.api.jdo.PersistenceManagerFactoryClass was not found。任何人都可以请建议。谢谢

PS：我已经做了一个grep（在linux上）在APP Engine SDK文件夹中找到PersistenceManagerFactoryClass，我找不到它。

Could not instantiate bean class [com.peerbuccoss.apps.mtp.dao.impl.CommonDaoImpl]:  Constructor threw exception; nested exception is javax.jdo.JDOFatalUserException: Class     org.datanucleus.api.jdo.PersistenceManagerFactoryClass was not found.
NestedThrowables:
java.lang.ClassNotFoundException:     org.datanucleus.api.jdo.PersistenceManagerFactoryClass:
java.lang.ClassNotFoundException: org.datanucleus.api.jdo.PersistenceManagerFactoryClass
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:176)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at javax.jdo.JDOHelper$18.run(JDOHelper.java:2018)
at javax.jdo.JDOHelper$18.run(JDOHelper.java:2017)
at java.security.AccessController.doPrivileged(Native Method)
at javax.jdo.JDOHelper.forName(JDOHelper.java:2015)
at javax.jdo.JDOHelper.invokeGetPersistenceManagerFactoryOnImplementation(JDOHelper.java:1162)
at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:808)
at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:1093)
at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:919)
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1 回答 1

3

就我而言，我使用的是 datanucleus-appengine- 2.1.2而不是 datanucleus-appengine- 1.0.10。对于 2.1.2 版，您必须使用以下PersistenceManagerFactoryClass更新您的 jdconfig.xml ：

<property name="javax.jdo.PersistenceManagerFactoryClass"
       value="org.datanucleus.api.jdo.JDOPersistenceManagerFactory"/>

我的 jdconfig.xml 是：

<?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.api.jdo.JDOPersistenceManagerFactory"/>
       <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"/>
       <property name="datanucleus.appengine.singletonPMFForName" value="true"/>
   </persistence-manager-factory>
</jdoconfig>
于 2014-10-05T09:25:49.503 回答