OpenJPA不从EJB实体生成/映射数据库表

我想从注释的EJB实体创建数据库。使用：Eclipse，Ant工具，Apache Tomee服务器，OpenJPA，JEE/EJB's，MySQL db。OpenJPA不从EJB实体生成/映射数据库表

我的应用程序在注入实体管理器（假设触发注释实体类后的db创建）期间失败。一些关键的应用程序部分：

异常我得到这个样子的：

prepare-database: 
    [echo] Inserting default user into database. 
    [java] Dec 09, 2013 9:45:29 AM org.apache.openejb.client.EventLogger log 
    [java] INFO: RemoteInitialContextCreated{providerUri=http://127.0.0.1:8080/tomee/ejb} 
    [java] Bean found 
    [java] Exception in thread "main" javax.ejb.EJBException: The bean encountered a non-application exception; nested exception is: 
    [java]  <openjpa-2.2.0-r422266:1244990 nonfatal general error> org.apache.openjpa.persistence.PersistenceException: There were errors initializing your configuration: <openjpa-2.2.0-r422266:1244990 fatal user error> org.apache.openjpa.util.UserException: A connection could not be obtained for driver class "null" and URL "null". You may have specified an invalid URL. 
    [java]  at org.apache.openjpa.jdbc.schema.DataSourceFactory.newConnectException(DataSourceFactory.java:255) 
    [java]  at org.apache.openjpa.jdbc.schema.DataSourceFactory.installDBDictionary(DataSourceFactory.java:241) 
    [java]  at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.getConnectionFactory(JDBCConfigurationImpl.java:733) 
    [java]  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    [java]  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) 
    [java]  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    [java]  at java.lang.reflect.Method.invoke(Method.java:606) 
    [java]  at org.apache.openjpa.lib.conf.ConfigurationImpl.instantiateAll(ConfigurationImpl.java:295) 
    [java]  at org.apache.openjpa.conf.OpenJPAConfigurationImpl.instantiateAll(OpenJPAConfigurationImpl.java:1671) 
    [java]  at org.apache.openjpa.kernel.AbstractBrokerFactory.makeReadOnly(AbstractBrokerFactory.java:646) 
    [java]  at org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:203) 
    [java]  at org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:156) 
    [java]  at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:227) 
    [java]  at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:60) 
    [java]  at org.apache.openejb.assembler.classic.ReloadableEntityManagerFactory.createEntityManager(ReloadableEntityManagerFactory.java:160) 
    [java]  at org.apache.openejb.persistence.JtaEntityManagerRegistry.getEntityManager(JtaEntityManagerRegistry.java:115) 
    [java]  at org.apache.openejb.persistence.JtaEntityManager.getEntityManager(JtaEntityManager.java:80) 
    [java]  at org.apache.openejb.persistence.JtaEntityManager.persist(JtaEntityManager.java:126) 
    [java]  at rs.ac.uns.ftn.informatika.mbs2.vezbe09.primer01.server.session.InitBean.init(InitBean.java:22) 
    [java]  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 

and so on ....

Ant任务触发数据库生成：

<target name="prepare-database"> 
     <echo message="Inserting default user into database."/> 
     <java classname="rs.ac.uns.ftn.informatika.mbs2.vezbe09.primer01.client.InitClient" fork="true"> 
      <classpath> 
       <pathelement path="${build}" /> 
       <fileset dir="${lib}"> 
        <include name="*.jar"/> 
       </fileset> 
      </classpath> 
     </java> 
</target>

“InitClient” 级（从这个蚂蚁任务开始）有在其主要方法中的下一个代码：

Context ctx = new InitialContext(); 
      Init init = (Init) ctx.lookup("InitBeanRemote"); 
      System.out.println("Bean found!"); 
      init.init();

“InitBean”类，其中实体管理r被注入：

@Stateless 
@Remote(Init.class) 
public class InitBean implements Init { 

    @PersistenceContext(unitName = "Vezbe09") 
    EntityManager em; 

    public void init() { 

     Korisnik korisnik = new Korisnik("Admin", "Admin", "admin", "admin"); 
     em.persist(korisnik); 
      //... 
     } 
}

persistent.xml - 持久性单元定义：在tomee.xml配置文件

<persistence-unit name="Vezbe09" transaction-type="JTA"> 
    <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider> 
    <jta-data-source>Vezbe09DS</jta-data-source> 
    <properties> 
     <property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema(ForeignKeys=true)" /> 
     <property name="openjpa.jdbc.DBDictionary" value="mysql" /> 
     <property name="openjpa.Log" value="DefaultLevel=WARN, Tool=INFO" /> 
    </properties> 
</persistence-unit>

数据源定义：

<Resource id="Vezbe09DS" type="DataSource"> 
    JdbcDriver   com.mysql.jdbc.Driver 
    JdbcUrl    jdbc:mysql://127.0.0.1:3306/Vezbe09 
    UserName   root 
    Password   123 
    JtaManaged   true 
    DefaultAutoCommit false 
</Resource>

（奇怪的是，我过去曾经运行过这个应用程序，而且运行良好。我正在获取数据库，并正在运行应用程序。）欣赏任何建议。

来源

2013-12-09 Vladimir

我的错！（仍在学习）。

上面的代码和设置都很好。我认为持久性提供者（openJPA）不仅创建数据库表，还创建数据库本身。我认为这是因为在数据源定义（包含db名称）中给出了“JdbcUrl属性”。显然，我需要创建数据库，并且持久性提供者正在为现有数据库创建表。所以，我已经（明确）使用mysql终端命令创建数据库“create database Vezbe09;” ，部署我的应用程序，在ant任务之上运行，触发openJPA，并且我的数据库中有表格。

来源

2013-12-09 12:26:06 Vladimir

你可以标记你的aswer接受然后！ – A4L

@ A4L - 嗯，我尝试了，但得到通知我只能在两天内接受我自己的答案。 – Vladimir

OpenJPA不从EJB实体生成/映射数据库表

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