请建议我更改所需的配置或欢迎任何建议
当我用hibernate 4.3.8和tomcat 6.0测试相同的代码时：
我正在使用一个bean和一个表进行测试，得到了无法查找JNDI名称异常，如下所示
发现以下异常：当我使用hibernate 4.3.8源代码调试时， 查找JNDI名称[java：comp / env / jdbc / db2]
Throwable occurred: javax.servlet.ServletException: Unable to lookup JNDI name [java:comp/env/jdbc/db2]
at com.application.Servlet.init(Servlet.java:109)
at javax.servlet.GenericServlet.init(GenericServlet.java:212)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1173)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:993)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4420)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4733)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Apr 2, 2015 9:38:47 AM org.apache.coyote.http11.Http11Protocol start
我用谷歌搜索它，发现它与tomcat 6.0有关，并在6.0.36版本中修复。但发现以下异常：
当我用6.0.36测试hibernate 4.3.8时得到以下异常：
我正在使用一个bean和一个表进行测试，得到异常nullpointer，如下所示 根本原因是方言获得空值（我使用hibernate 4.3.8源代码调试）。
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
java.lang.NullPointerException
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:244)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:111)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:234)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:206)
at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1887)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1845)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1930)
at com.application.HibernateSessionFactory.<init>(HibernateSessionFactory.java:53)
at com.application.HibernateSessionFactory.newInstance(HibernateSessionFactory.java:82)
at com.application.Servlet.init(Servlet.java:77)
at javax.servlet.GenericServlet.init(GenericServlet.java:212)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1206)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1026)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4421)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4734)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
我的休眠配置：
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- Freightliner DB2 version uses different identity SQL than built-in Hibernate DB2 dialects -->
<property name="hibernate.connection.datasource">java:comp/env/jdbc/xxx</property>
<property name="hibernate.connection.driver_class">COM.ibm.db2.jdbc.app.DB2Driver</property>
<property name="hibernate.dialect">org.hibernate.dialect.DB2390Dialect</property>
<property name="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</property>
<property name="hibernate.cglib.use_reflection_optimizer">true</property>
<property name="hibernate.show_sql">true</property>
我的会话工厂创建代码：
sessionFactory =new Configuration()
.configure("/hibernate.cfg.xml")
.setProperty("hibernate.show_sql", "true")).buildSessionFactory();
在调试上述错误时得到以下异常：
java.sql.SQLException: [IBM][JDBC Driver] CLI0626E getDatabaseMajorVersion is not supported in this version of DB2 JDBC 2.0 driver.
at COM.ibm.db2.jdbc.app.SQLExceptionGenerator.throwNotSupportedByDB2(Unknown Source)
at COM.ibm.db2.jdbc.app.DB2DatabaseMetaData.getDatabaseMajorVersion(Unknown Source)
添加以下属性后删除了上述异常：
<property name="hibernate.temp.use_jdbc_metadata_defaults">false</property>
在hibernate 4.3.8中读取如下属性，
final boolean useJdbcMetadata = ConfigurationHelper.getBoolean( "hibernate.temp.use_jdbc_metadata_defaults", configValues, true );
所以我们应该提到上面提到的财产。
以下链接帮助我确定了修复方法： JPA 2.0 Provider Hibernate 3.6 for DB2 v9.5 type 2 driver is throwing exception in configuration prepration