我无法理解load和get之间的区别.当我给session.load时,下面的代码不起作用.它给出了空指针异常.但是当我使用session.get()时,同样有效.

public Employee getEmployee(final String id){

HibernateCallback callback = new HibernateCallback() {

public Object doInHibernate(Session session)

throws HibernateException,sqlException {

//return (Employee)session.load(Employee.class,id); doesn't work

return (Employee)session.get(Employee.class,id); //it works

}

};

return (Employee)hibernateTemplate.execute(callback);

}

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我还想了解如何将Session对象传递给doInHibernate.

会话何时开始以及何时结束？

堆栈跟踪如下

Exception in thread "main" java.lang.NullPointerException

at org.hibernate.tuple.AbstractEntityTuplizer.createProxy(AbstractEntityTuplizer.java:372)

at org.hibernate.persister.entity.AbstractEntityPersister.createProxy(AbstractEntityPersister.java:3121)

at org.hibernate.event.def.DefaultLoadEventListener.createProxyIfNecessary(DefaultLoadEventListener.java:232)

at org.hibernate.event.def.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:173)

at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:87)

at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:862)

at org.hibernate.impl.SessionImpl.load(SessionImpl.java:781)

at org.hibernate.impl.SessionImpl.load(SessionImpl.java:774)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at org.springframework.orm.hibernate3.HibernateTemplate$CloseSuppressingInvocationHandler.invoke(HibernateTemplate.java:1282)

at $Proxy0.load(Unknown Source)

at hibernate.EmployeeDao$1.doInHibernate(EmployeeDao.java:25)

at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:406)

at org.springframework.orm.hibernate3.HibernateTemplate.execute(HibernateTemplate.java:339)

at hibernate.EmployeeDao.getEmployee(EmployeeDao.java:29)

at hibernate.SpringHibernateTest.main(SpringHibernateTest.java:26)

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