Caused by: org.hibernate.PropertyNotFoundException:

Exception in thread "main" java.lang.ExceptionInInitializerError
at biz.ProductBiz.getProduct(ProductBiz.java:20)
at servlet.Test.main(Test.java:13)
Caused by: java.lang.RuntimeException: hibernate初始化失败
at Utils.HibernateSessionFactory.(HibernateSessionFactory.java:26)
... 2 more
Caused by: org.hibernate.HibernateException: Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]
at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:108)
at org.hibernate.tuple.entity.EntityTuplizerFactory.constructDefaultTuplizer(EntityTuplizerFactory.java:133)
at org.hibernate.tuple.entity.EntityEntityModeToTuplizerMapping.(EntityEntityModeToTuplizerMapping.java:80)
at org.hibernate.tuple.entity.EntityMetamodel.(EntityMetamodel.java:322)
at org.hibernate.persister.entity.AbstractEntityPersister.(AbstractEntityPersister.java:485)
at org.hibernate.persister.entity.SingleTableEntityPersister.(SingleTableEntityPersister.java:133)
at org.hibernate.persister.PersisterFactory.createClassPersister(PersisterFactory.java:84)
at org.hibernate.impl.SessionFactoryImpl.(SessionFactoryImpl.java:286)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1872)
at Utils.HibernateSessionFactory.(HibernateSessionFactory.java:24)
... 2 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:105)
... 11 more
Caused by: org.hibernate.PropertyNotFoundException: Could not find a getter for userName in class pojo.Product
at org.hibernate.property.BasicPropertyAccessor.createGetter(BasicPropertyAccessor.java:326)
at org.hibernate.property.BasicPropertyAccessor.getGetter(BasicPropertyAccessor.java:320)
at org.hibernate.mapping.Property.getGetter(Property.java:304)
at org.hibernate.tuple.entity.PojoEntityTuplizer.buildPropertyGetter(PojoEntityTuplizer.java:297)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.(AbstractEntityTuplizer.java:155)
at org.hibernate.tuple.entity.PojoEntityTuplizer.(PojoEntityTuplizer.java:77)

... 16 more

在使用hibernate框架，报错Exception in thread "main" java.lang.ExceptionInInitializerError

看到最后那个Caused by: org.hibernate.PropertyNotFoundException: Could not find a getter for userName in class pojo.Product

显示是持久类里没有username字段，找到xml的持久类映射文件，发现自己的类属性和数据库字段copy过来没有进行更改

改完就行了