EJB3(中文版) 第八集 Standalone Persistence

在不启动Jboss或其它应用服务器的情况下运行EJB3程序.
Enterprise_JavaBeans_3一书中的ex05_2例子.

1.检查数据库的启动
2.注意事务类型
  transaction-type="RESOURCE_LOCAL"
3.用到jboss-EJB-3.0_Embeddable_ALPHA_9包中的Jar包
4.persistence.xml文件内容
<?xml version="1.0" encoding="UTF-8"?>
<persistence>
   <persistence-unit name="titan" transaction-type="RESOURCE_LOCAL">
       <properties>
            <property name="hibernate.connection.driver_class" value="org.gjt.mm.mysql.Driver"/>
            <property name="hibernate.connection.username" value="root"/>
            <property name="hibernate.connection.password" value="1234"/>
            <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/titan"/>
            <property name="hibernate.hbm2ddl.auto" value="create-drop"/>
            <property name="hibernate.cache.provider_class" value="org.hibernate.cache.HashtableCacheProvider"/>
       </properties>
   </persistence-unit>
</persistence>
5.强调一下Eclipse工作区的路径不能有空格.
6.这里面我们在前面已经介绍过了.
7.实际在数据库中并没有真正的创建表，也没有将数据存入表中。
易出现的异常:

Exception in thread "main" javax.persistence.PersistenceException: No Persistence provider for EntityManager named titan
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:55)
at com.lyh.ejb3.clients.StandaloneClient.main(StandaloneClient.java:28)
解决方法:加入jboss-EJB-3.0_Embeddable_ALPHA_9包中的
hibernate-all.jar,jboss-ejb3-all.jar,thirdparty-all.jar三个Jar文件即可.

og4j:WARN No appenders could be found for logger (org.hibernate.ejb.Version).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" javax.persistence.PersistenceException: org.hibernate.HibernateException: JDBC Driver class not found: com.mysql.jdbc.Driver
at org.hibernate.ejb.Ejb3Configuration.createEntityManagerFactory(Ejb3Configuration.java:217)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:114)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:51)
at com.lyh.ejb3.clients.StandaloneClient.main(StandaloneClient.java:28)
Caused by: org.hibernate.HibernateException: JDBC Driver class not found: com.mysql.jdbc.Driver
at org.hibernate.connection.DriverManagerConnectionProvider.configure(DriverManagerConnectionProvider.java:66)
at org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:124)
at org.hibernate.ejb.InjectionSettingsFactory.createConnectionProvider(InjectionSettingsFactory.java:29)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:62)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:1933)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1216)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:631)
at org.hibernate.ejb.Ejb3Configuration.createEntityManagerFactory(Ejb3Configuration.java:760)
at org.hibernate.ejb.Ejb3Configuration.createFactory(Ejb3Configuration.java:151)
at org.hibernate.ejb.Ejb3Configuration.createEntityManagerFactory(Ejb3Configuration.java:205)
... 3 more
Caused by: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:100)
at org.hibernate.connection.DriverManagerConnectionProvider.configure(DriverManagerConnectionProvider.java:61)
... 12 more
解决方法:将Mysql数据库的驱动加入到工作区中.

log4j:WARN No appenders could be found for logger (org.hibernate.ejb.Version).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" javax.persistence.PersistenceException: org.hibernate.HibernateException: Hibernate Dialect must be explicitly set
at org.hibernate.ejb.Ejb3Configuration.createEntityManagerFactory(Ejb3Configuration.java:217)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:114)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:51)
at com.lyh.ejb3.clients.StandaloneClient.main(StandaloneClient.java:28)
Caused by: org.hibernate.HibernateException: Hibernate Dialect must be explicitly set
at org.hibernate.dialect.DialectFactory.determineDialect(DialectFactory.java:57)
at org.hibernate.dialect.DialectFactory.buildDialect(DialectFactory.java:39)
at org.hibernate.cfg.SettingsFactory.determineDialect(SettingsFactory.java:409)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:119)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:1933)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1216)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:631)
at org.hibernate.ejb.Ejb3Configuration.createEntityManagerFactory(Ejb3Configuration.java:760)
at org.hibernate.ejb.Ejb3Configuration.createFactory(Ejb3Configuration.java:151)
at org.hibernate.ejb.Ejb3Configuration.createEntityManagerFactory(Ejb3Configuration.java:205)
... 3 more
上面是没有启动数据库的情况下出现的异常.

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