org.hibernate.MappingException: Named query not known: query_user_by_username

2011-07-13 11:24:27  releasing JDBC connection [ (open PreparedStatements: 0, globally: 0) (open ResultSets: 0, globally: 0)]

java.lang.reflect.InvocationTargetException
 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 com.ngbss.admin.common.TransactionProxy.invoke(TransactionProxy.java:37)
 at $Proxy0.queryUserByName(Unknown Source)
 at com.ngbss.admin.struts.TestService.main(TestService.java:16)
Caused by: org.hibernate.MappingException: Named query not known: query_user_by_username
 at org.hibernate.impl.AbstractSessionImpl.getNamedQuery(AbstractSessionImpl.java:93)
 at org.hibernate.impl.SessionImpl.getNamedQuery(SessionImpl.java:1288)
 at com.ngbss.admin.basedao.AbstractDao.queryObjectsByQueryName(AbstractDao.java:263)
 at com.ngbss.admin.service.UserInfoServiceImpl.queryUserByName(UserInfoServiceImpl.java:29)
 ... 7 more
Exception in thread "main" java.lang.NullPointerException
 at com.ngbss.admin.struts.TestService.main(TestService.java:17)

 

解决方案:

原因是因为.使用queryName查询时,在Hibernate.hbm.xml中未定义

query 对象的 "query_user_by_username" hql语句.