jsp工程导入后为什么xml文件都报错 运行程序报一下错误

com.ibatis.common.jdbc.exception.NestedSQLException:   
--- The error occurred in xj/beiw/po/User.xml.  
--- The error occurred while preparing the mapped statement for execution.  
--- Check the User.findUser.  
--- Check the parameter map.  
--- Cause: java.lang.RuntimeException: Error getting property 'getAdmin_name' of 'null'.  Cause: java.lang.NullPointerException
at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback(GeneralStatement.java:188)
at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryForObject(GeneralStatement.java:104)
at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForObject(SqlMapExecutorDelegate.java:566)
at com.ibatis.sqlmap.engine.impl.SqlMapExecutorDelegate.queryForObject(SqlMapExecutorDelegate.java:541)
at com.ibatis.sqlmap.engine.impl.SqlMapSessionImpl.queryForObject(SqlMapSessionImpl.java:106)
at com.ibatis.sqlmap.engine.impl.SqlMapClientImpl.queryForObject(SqlMapClientImpl.java:83)
at xj.beiw.dao.UserDaoImpl.findUser(UserDaoImpl.java:16)
at xj.beiw.service.UserServiceImpl.checkUserLogin(UserServiceImpl.java:35)
at filter.UserLoginFilter.doFilter(UserLoginFilter.java:35)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:228)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:216)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:634)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:445)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.RuntimeException: Error getting property 'getAdmin_name' of 'null'.  Cause: java.lang.NullPointerException
at com.ibatis.sqlmap.engine.accessplan.PropertyAccessPlan.getProperties(PropertyAccessPlan.java:69)
at com.ibatis.sqlmap.engine.exchange.JavaBeanDataExchange.getData(JavaBeanDataExchange.java:91)
at com.ibatis.sqlmap.engine.mapping.parameter.BasicParameterMap.getParameterObjectValues(BasicParameterMap.java:132)
at com.ibatis.sqlmap.engine.mapping.statement.GeneralStatement.executeQueryWithCallback(GeneralStatement.java:165)
... 20 more
Caused by: java.lang.NullPointerException
at sun.reflect.GeneratedMethodAccessor74.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.ibatis.sqlmap.engine.accessplan.PropertyAccessPlan.getProperties(PropertyAccessPlan.java:63)
... 23 more