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

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本文记录了一次使用Hibernate框架进行数据库查询时出现的问题及其解决过程。主要原因是未在Hibernate配置文件中定义所需的HQL查询语句，导致运行时抛出异常。通过在Hibernate.hbm.xml文件中增加相应的查询定义，成功解决了该问题。

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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)