用于google的Datanucleus，缺少org.datanucleus.store.rdbms.RDBMSStoreManager

Question

我正在尝试让datanucleus在google java应用程序中管理我的Google表。

遗憾的是，我收到以下错误消息：

org.datanucleus.exceptions.ClassNotResolvedException: Class
"org.datanucleus.store.rdbms.RDBMSStoreManager" was not found 
in the CLASSPATH. Please check your specification and your CLASSPATH.

但我们还是按规矩去吧。这是我的jdoconfig.xml

<?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_3_0.xsd">

<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="false" />
    <prop key="javax.jdo.option.Multithreaded">true</prop>
    <property name="datanucleus.cache.level2" value="true" />
    <property name="datanucleus.cache.level2.type" value="none"/>

    <property name="datanucleus.cache.level1.type" value="soft"/>
    <property name="datanucleus.appengine.storageVersion"
                 value="READ_OWNED_CHILD_KEYS_FROM_PARENTS"/>
</persistence-manager-factory>

<persistence-manager-factory name="cloud-sql">
    <property name="javax.jdo.PersistenceManagerFactoryClass"
        value="org.datanucleus.api.jdo.JDOPersistenceManagerFactory" />
    <property name="javax.jdo.option.ConnectionDriverName"
         value="com.mysql.jdbc.GoogleDriver"/>
    <property name="javax.jdo.option.ConnectionUserName" value="root"/>
    <property name="datanucleus.autoCreateSchema" value="true"/>
</persistence-manager-factory>
</jdoconfig>

两个持久化管理器工厂声明是一个用于应用引擎非关系数据存储，一个用于google。

在构建我的SQLManager时抛出异常。构造函数状态

@Inject
public SQLManager(final NamedQueryProvider queryProvider) {
    super(queryProvider);
    final Map<String, String> properties = new HashMap();
    properties.put("javax.jdo.option.ConnectionURL", getConnectionUrl());
    pmFactory = JDOHelper.getPersistenceManagerFactory(properties,
            "cloud-sql");
}

您可以说:您必须从类路径中遗漏一个所需的罐子。然而，在我的pom.xml中

<dependency>
    <groupId>org.datanucleus</groupId>
    <artifactId>datanucleus-accessplatform-jdo-rdbms</artifactId>
    <version>3.3.4</version>
    <type>pom</type>
</dependency>
<dependency>
    <groupId>org.datanucleus</groupId>
    <artifactId>datanucleus-rdbms</artifactId>
    <version>3.2.8</version>
</dependency>

第二个工件实际上是不需要的，因为第一个工件是由第一个工件扔进来的。我把它作为最初的解决办法，但它不起作用。

有人有类似的想法吗？似乎没有关于datanucleus+jdo+cloud sql的文档，但是由于我使用它访问GAE数据存储，所以我希望对云sql重用同样的文档。

编辑

这是堆栈跟踪的相关部分。不幸的是，我无法在日志中看到jars应用程序引擎正在寻找的内容。

Class "org.datanucleus.store.rdbms.RDBMSStoreManager" was not found in the CLASSPATH.
Please check your specification and your CLASSPATH.
org.datanucleus.exceptions.ClassNotResolvedException: Class
"org.datanucleus.store.rdbms.RDBMSStoreManager" was not found in the CLASSPATH. Please
check your specification and your CLASSPATH.
at org.datanucleus.JDOClassLoaderResolver.classForName(JDOClassLoaderResolver.java:245)
at org.datanucleus.plugin.NonManagedPluginRegistry.createExecutableExtension(NonManagedPluginRegistry.java:679)
at org.datanucleus.plugin.PluginManager.createExecutableExtension(PluginManager.java:290)
at org.datanucleus.NucleusContext.createStoreManagerForProperties(NucleusContext.java:410)
at org.datanucleus.NucleusContext.initialise(NucleusContext.java:280)
at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.freezeConfiguration(JDOPersistenceManagerFactory.java:591)
at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.createPersistenceManagerFactory(JDOPersistenceManagerFactory.java:326)
at org.datanucleus.api.jdo.JDOPersistenceManagerFactory.getPersistenceManagerFactory(JDOPersistenceManagerFactory.java:256)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.google.appengine.tools.development.agent.runtime.Runtime.invoke(Runtime.java:115)
at javax.jdo.JDOHelper$16.run(JDOHelper.java:1965)
at java.security.AccessController.doPrivileged(Native Method)
at javax.jdo.JDOHelper.invoke(JDOHelper.java:1960)
at javax.jdo.JDOHelper.invokeGetPersistenceManagerFactoryOnImplementation(JDOHelper.java:1128)
at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:808)
at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:1093)
at javax.jdo.JDOHelper.getPersistenceManagerFactory(JDOHelper.java:960)
at com.mycompany.myproduct.mypackage.SQLManager.<init>(SQLManager.java:24)

Answer 1

问题是数据核jar版本不匹配。

我在3.0.*版本中使用了datanucleus core、datanucleus api-jdo等，而datanucleus rdbms 3.2。自从我意识到我不需要它带来的所有jars之后，我已经消除了datanucleus accessplatform-jdo-rdbms的依赖，并将datanucleus rdbms降级为3.0.10版本。(看起来数据核-应用程序插件还不支持3.2系列，这就是为什么我更喜欢降级而不是升级)。

现在我可以连接到云sql了。