1问:Hibernate初始化时总是报错:java.lang.NoClassDefFoundError Hibernate初始化时出现出错代码:
java.lang.NoClassDefFoundError: net/sf/ehcache/CacheException
答:这是新手常见问题。是因为使用默认设置时,Hibernate文档里指出的Hibernate库不完整,缺少ehcache.jar(用于支持Ehcache的相关文件)。配置中加入以上文件,就可以避免初始化时出现java.lang.NoClassDefFoundError:net/sf/ehcache/CacheException异常。 2问:Hibernate报错:"Not binding factory to JNDI, no JNDI name configured"
运行下列程序:
public static void main(String[] args) throws Exception {
Configuration conf = new Configuration().addClass(Person.class);
......
出现错误码:
12:15:34,250 INFO SessionFactoryObjectFactory:82 - Not binding factory to JNDI, no JNDI name configured
java.lang.UnsupportedOperationException: The user must supply a JDBC connection
at net.sf.Hibernate.connection.UserSuppliedConnectionProvider.getConnection (UserSuppliedConnectionProvider.java:32)
at net.sf.Hibernate.impl.BatcherImpl.openConnection(BatcherImpl.java:289)
at net.sf.Hibernate.impl.SessionImpl.connect(SessionImpl.java:3361)
at net.sf.Hibernate.impl.SessionImpl.connection(SessionImpl.java:3321)
at net.sf.Hibernate.impl.BatcherImpl.prepareQueryStatement(BatcherImpl.java:66)
at net.sf.Hibernate.loader.Loader.prepareQueryStatement(Loader.java:779)
at net.sf.Hibernate.hql.QueryTranslator.iterate(QueryTranslator.java:864)
at net.sf.Hibernate.impl.SessionImpl.iterate(SessionImpl.java:1618)
at net.sf.Hibernate.impl.QueryImpl.iterate(QueryImpl.java:27)
at com.Hibernate.person.TestQueryPerson.main(TestQueryPerson.java:28)
Exception in thread "main"
答:修改main函数,为该程序指定配置文件即可。
public static void main(String[] args) throws Exception {
File file=new File("./Hibernate.cfg.xml");
Configuration conf = new Configuration().configure(file);
......
配置文件如下。