Question

我正在使用Google App Engine（appengine-java-sdk-1.6.6）为使用JDO和maven（maven-gae-plugin）的应用程序进行项目结构和构建。构建成功，同时使用DataNucleus Enhancer增强我的域类。

运行应用程序时，我遇到了这个问题：找不到类org.datanucleus.api.jdo.PersistenceManagerFactoryClass。任何人都可以建议。感谢

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)

Answer 1

在我的情况下，我使用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>

找不到类org.datanucleus.api.jdo.PersistenceManagerFactoryClass

1 个答案: