关于Hibernate配置文件的问题

使用hibernate.properties配置文件正常。
换用hibernate.cfg.xml文件后，在读取配置文件时出现下面的提示：
16:28:48,866  INFO Environment:462 - Hibernate 2.1.2
16:28:48,876  INFO Environment:491 - hibernate.properties not found
16:28:48,876  INFO Environment:519 - using CGLIB reflection optimizer
16:28:48,876  INFO Configuration:329 - Mapping resource: hello/Message.hbm.xml
16:28:49,457  INFO Binder:229 - Mapping class: hello.Message -> Messages
16:28:49,547  INFO Configuration:595 - processing one-to-many association mappings
16:28:49,547  INFO Configuration:604 - processing one-to-one association property references
16:28:49,547  INFO Configuration:629 - processing foreign key constraints
16:28:49,567  WARN SettingsFactory:50 - No dialect set - using GenericDialect: The dialect was not set. Set the property hibernate.dialect.
16:28:49,567  INFO Dialect:82 - Using dialect: net.sf.hibernate.dialect.GenericDialect
16:28:49,567  INFO SettingsFactory:62 - Use outer join fetching: false
16:28:49,577  WARN UserSuppliedConnectionProvider:25 - No connection properties specified - the user must supply JDBC connections
16:28:49,577  INFO TransactionManagerLookupFactory:33 - No TransactionManagerLookup configured (in JTA environment, use of process level read-write cache is not recommended)
16:28:49,577  INFO SettingsFactory:102 - Use scrollable result sets: false
net.sf.hibernate.MappingException: Dialect does not support identity key generation
at net.sf.hibernate.dialect.Dialect.getIdentitySelectString(Dialect.java:289)
at net.sf.hibernate.persister.AbstractEntityPersister.<init>(AbstractEntityPersister.java:633)
at net.sf.hibernate.persister.EntityPersister.<init>(EntityPersister.java:715)
at net.sf.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:41)
at net.sf.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:137)
at net.sf.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:750)
at hello.Hello.main(Hello.java:31)
16:28:49,577  INFO SettingsFactory:105 - Use JDBC3 getGeneratedKeys(): false
16:28:49,647  INFO SettingsFactory:108 - Optimize cache for minimal puts: false
16:28:49,647  INFO SettingsFactory:117 - Query language substitutions: {}
16:28:49,707  INFO SettingsFactory:128 - cache provider: net.sf.ehcache.hibernate.Provider
16:28:49,907  INFO Configuration:1080 - instantiating and configuring caches
16:28:50,188  INFO SessionFactoryImpl:119 - building session factory
Exception in thread "main"

/////my hibernate.cfg.xml file.////////

<?xml version='1.0' encoding='gb2312'?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd">
<hibernate-configuration>
  <session-factory>
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/content</property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.connection.password"></property>
    <property name="hibernate.connection.pool.size">20</property>
    <property name="hibernate.show_sql">true</property>
    <property name="jdbc.fetch_size">50</property>
    <property name="jdbc.batch_size">25</property>
    <property name="jdbc.use_scrollable_resultset">false</property>
    <property name="hibernate.dialect">net.sf.hibernate.dialect.MySQLDialect</property>
  </session-factory>
</hibernate-configuration>

在JB中，运行代码时，hibernate.cfg.xml自动放置在classes目录下（hibernate.properties文件也是在这个目录下），为什么不能正确获得正确的dialect，是哪里错了？请高手指教！！！

运行时找不到properties文件，应该再自动查找并读取hibernate.xfg.xml文件才对啊，难道是hibernate版本的问题？我使用的版本是2.1.2，哪位高手关注一下。

问题倒是解决了，但是否非得这样指定配置文件？
cfg = new Configuration().configure("/hibernate.cfg.xml");

我也遇到這樣的問題，是不是只有在web app中才能用hibernate.cfg.xml呢