Hibernate 3 createQuery（）返回基本联接的NPE-what'；怎么了？

当我尝试使用hibernate 3.3.0进行简单的多对一连接时，我在

createQuery

中得到了一个NPE。我已经考虑过空表、错误的实体映射、不存在的会话等可能性，但我不熟悉hibernate注释，所以我不能100%确定我的注释是否正确。我想这里可能缺少一两个注释，或者HQL本身存在语法错误，但我不确定从这里可以走到哪里

我有两个表，

EventsJobs

和

EventsJobsTags

，它们共享一个公共属性，

docId

。两者之间存在多对一关系，因此

EventsJobs

中的一条记录可以在

EventsJobsTags

中有多条记录

我的类（为简洁起见省略了导入/获取/设置/构造函数）：

及

查询：

Query q = sessionFactory.getCurrentSession().createQuery("
from com.x.y.model.EventJobTag as et
left join com.x.y.model.EventJob as e 
where e.docType = 'jobs' and et.taxonomyId in ('6079')")
            .setString("docType", type)
            .setString("search", search);

堆栈跟踪：

SEVERE: Servlet.service() for servlet [xyz] in context with path [/abc] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
java.lang.NullPointerException
at org.hibernate.hql.ast.HqlSqlWalker.createFromJoinElement(HqlSqlWalker.java:320)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.joinElement(HqlSqlBaseWalker.java:3275)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3067)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:2945)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:688)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:544)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:281)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:229)
at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:228)
at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:160)
at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:111)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:77)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:56)
at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:72)
at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:133)
at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:112)
at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1623)
at com.x.y.dao.SearchResultsDaoImpl.searchResults(SearchResultsDaoImpl.java:30)
at com.x.y.dao.SearchResultsDaoImpl.jobResults(SearchResultsDaoImpl.java:20)
at com.x.y.service.ResumeServiceImpl.listJobs(ResumeServiceImpl.java:45)
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.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy17.listJobs(Unknown Source)
at com.x.y.controller.ResumeController.taxonomySearch(ResumeController.java:163)
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.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:436)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:424)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)

SEVERE:Servlet[xyz]在路径为[/abc]的上下文中的Servlet.service（）引发了异常[请求处理失败；嵌套异常为java.lang.NullPointerException]，其根本原因是
java.lang.NullPointerException
位于org.hibernate.hql.ast.HqlSqlWalker.createFromJoinElement（HqlSqlWalker.java:320）
位于org.hibernate.hql.antlr.HqlSqlBaseWalker.joinElement（HqlSqlBaseWalker.java:3275）
位于org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElement（HqlSqlBaseWalker.java:3067）
位于org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElementList（HqlSqlBaseWalker.java:2945）
位于org.hibernate.hql.antlr.HqlSqlBaseWalker.fromClause（HqlSqlBaseWalker.java:688）
位于org.hibernate.hql.antlr.HqlSqlBaseWalker.query（HqlSqlBaseWalker.java:544）
位于org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement（HqlSqlBaseWalker.java:281）
位于org.hibernate.hql.antlr.HqlSqlBaseWalker.statement（HqlSqlBaseWalker.java:229）
位于org.hibernate.hql.ast.QueryTranslatorImpl.analyze（QueryTranslatorImpl.java:228）
位于org.hibernate.hql.ast.QueryTranslatorImpl.docomFile（QueryTranslatorImpl.java:160）
位于org.hibernate.hql.ast.QueryTranslatorImpl.compile（QueryTranslatorImpl.java:111）
在org.hibernate.engine.query.HQLQueryPlan.（HQLQueryPlan.java:77）
在org.hibernate.engine.query.HQLQueryPlan.（HQLQueryPlan.java:56）
位于org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan（QueryPlanCache.java:72）
位于org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan（AbstractSessionImpl.java:133）
位于org.hibernate.impl.AbstractSessionImpl.createQuery（AbstractSessionImpl.java:112）
位于org.hibernate.impl.SessionImpl.createQuery（SessionImpl.java:1623）
在com.x.y.dao.SearchResultsDaoImpl.searchResults上（SearchResultsDaoImpl.java:30）
在com.x.y.dao.SearchResultsDaoImpl.jobResults上（SearchResultsDaoImpl.java:20）
位于com.x.y.service.ResumeServiceImpl.listJobs（ResumeServiceImpl.java:45）
在sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）处
位于sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:39）
在sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:25）中
位于java.lang.reflect.Method.invoke（Method.java:597）
位于org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection（AopUtils.java:318）
位于org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint（ReflectiveMethodInvocation.java:183）
在org.springframework.aop.framework.ReflectiveMethodInvocation.procedue（ReflectiveMethodInvocation.java:150）上
位于org.springframework.transaction.interceptor.TransactionInterceptor.invoke（TransactionInterceptor.java:110）
位于org.springframework.aop.framework.ReflectiveMethodInvocation.procedue（ReflectiveMethodInvocation.java:172）
位于org.springframework.aop.framework.JdkDynamicAopProxy.invoke（JdkDynamicAopProxy.java:202）
位于$Proxy17.listJobs（未知来源）
位于com.x.y.controller.ResumeController.taxonomySearch（ResumeController.java:163）
在sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）处
位于sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:39）
在sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:25）中
位于java.lang.reflect.Method.invoke（Method.java:597）
位于org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod（HandlerMethodInvoker.java:176）
位于org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod（AnnotationMethodHandlerAdapter.java:436）
位于org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle（AnnotationMethodHandlerAdapter.java:424）
位于org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:923）
位于org.springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java:852）
位于org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:882）
位于org.springframework.web.servlet.FrameworkServlet.doPost（FrameworkServlet.java:789）
位于javax.servlet.http.HttpServlet.service（HttpServlet.java:641）
位于javax.servlet.http.HttpServlet.service（HttpServlet.java:722）
位于org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:305）
位于org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:210）
位于org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:225）
位于org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:169）
位于org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:472）
位于org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:168）
位于org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:98）
位于org.apache.catalina.valves.AccessLogValve.invoke（AccessLogValve.java:927）
位于org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:118）
位于org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:407）
位于org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:999）
位于org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.pro
Query q = sessionFactory.getCurrentSession().createQuery("
from com.x.y.model.EventJobTag as et
left join com.x.y.model.EventJob as e 
where e.docType = 'jobs' and et.taxonomyId in ('6079')")
            .setString("docType", type)
            .setString("search", search);

SEVERE: Servlet.service() for servlet [xyz] in context with path [/abc] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
java.lang.NullPointerException
at org.hibernate.hql.ast.HqlSqlWalker.createFromJoinElement(HqlSqlWalker.java:320)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.joinElement(HqlSqlBaseWalker.java:3275)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3067)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:2945)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:688)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:544)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:281)
at org.hibernate.hql.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:229)
at org.hibernate.hql.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:228)
at org.hibernate.hql.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:160)
at org.hibernate.hql.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:111)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:77)
at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:56)
at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:72)
at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:133)
at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:112)
at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1623)
at com.x.y.dao.SearchResultsDaoImpl.searchResults(SearchResultsDaoImpl.java:30)
at com.x.y.dao.SearchResultsDaoImpl.jobResults(SearchResultsDaoImpl.java:20)
at com.x.y.service.ResumeServiceImpl.listJobs(ResumeServiceImpl.java:45)
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.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:318)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
at $Proxy17.listJobs(Unknown Source)
at com.x.y.controller.ResumeController.taxonomySearch(ResumeController.java:163)
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.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:436)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:424)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:680)

@OneToMany(mappedBy="eventJob")
List<EventJobTag> tags;

@ManyToOne
@JoinColumn(name="eventJobId")
EventJob job;