做级联查询的时候，有时候启动tomcat，访问正常，有时候报java.lang.NullPointerException。
java.lang.NullPointerException
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.hibernate.property.BasicPropertyAccessor$BasicGetter.get(BasicPropertyAccessor.java:145)
at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(AbstractEntityTuplizer.java:183)
at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(AbstractEntityPersister.java:3596)
at org.hibernate.type.EntityType.isEqual(EntityType.java:297)
at org.hibernate.type.ComponentType.isEqual(ComponentType.java:143)
at org.hibernate.engine.CollectionKey.equals(CollectionKey.java:50)
at java.util.HashMap.put(HashMap.java:376)
at org.hibernate.engine.StatefulPersistenceContext.addCollection(StatefulPersistenceContext.java:764)
at org.hibernate.engine.StatefulPersistenceContext.addUninitializedCollection(StatefulPersistenceContext.java:733)
at org.hibernate.type.CollectionType.getCollection(CollectionType.java:609)
at org.hibernate.type.CollectionType.resolveKey(CollectionType.java:408)
at org.hibernate.type.CollectionType.resolve(CollectionType.java:402)
at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:120)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:854)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.loadEntity(Loader.java:1860)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:48)
at org.hibernate.loader.entity.EntityLoader.loadByUniqueKey(EntityLoader.java:85)
at org.hibernate.persister.entity.AbstractEntityPersister.loadByUniqueKey(AbstractEntityPersister.java:1649)
at org.hibernate.type.EntityType.loadByUniqueKey(EntityType.java:608)
at org.hibernate.type.EntityType.resolve(EntityType.java:382)
at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:120)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:854)
at org.hibernate.loader.Loader.doQuery(Loader.java:729)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)
at org.hibernate.loader.Loader.doList(Loader.java:2213)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)
at org.hibernate.loader.Loader.list(Loader.java:2099)
at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:289)
at org.hibernate.impl.SessionImpl.listCustomQuery(SessionImpl.java:1695)
at org.hibernate.impl.AbstractSessionImpl.list(AbstractSessionImpl.java:142)
at org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:152)
at com.v3.dao.EntityDAO.findBySqlAddClass(EntityDAO.java:159)
at com.v3.dao.EntityDAO$$FastClassByCGLIB$$3c0dbc4f.invoke()
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:617)
at com.v3.dao.EntityDAO$$EnhancerByCGLIB$$9881afb3.findBySqlAddClass()
at com.v3.service.EntityServiceImpl.findBySqlAddClass(EntityServiceImpl.java:194)
at com.v3.service.EntityServiceImpl$$FastClassByCGLIB$$ed745c95.invoke()
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:688)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:89)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:621)
at com.v3.service.EntityServiceImpl$$EnhancerByCGLIB$$9be70e03.findBySqlAddClass()
at com.v3.service.AuthorService.getAuthorListPage(AuthorService.java:241)
at com.v3.action.AuthorController.index(AuthorController.java:83)
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:426)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at com.v3.action.CharacterEncodingAdminFilter.doFilter(CharacterEncodingAdminFilter.java:30)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
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:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:662)
代码：
@OneToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "category_sec", columnDefinition = "id", insertable = false, updatable = false, nullable = true)
@NotFound(action=NotFoundAction.IGNORE)
public BookCategoryV3 getBookCategoryV3() {
return bookCategoryV3;
}
public void setBookCategoryV3(BookCategoryV3 bookCategoryV3) {
this.bookCategoryV3 = bookCategoryV3;
}
@OneToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "zc_id", columnDefinition = "bookId", insertable = false, updatable = false, nullable = true)
@OrderBy(clause = "dashang_all DESC")
@NotFound(action=NotFoundAction.IGNORE)
public BookDashangCount getBookDashangCount() {
return bookDashangCount;
}
public void setBookDashangCount(BookDashangCount bookDashangCount) {
this.bookDashangCount = bookDashangCount;
}
@OneToMany(fetch = FetchType.LAZY)
@JoinColumn(name = "bookId", referencedColumnName = "zc_id", insertable = false,updatable = false, nullable = true)
@NotFound(action=NotFoundAction.IGNORE)
public List<ZwscBookFs> getZwscBookFs() {
return zwscBookFs;
}
public void setZwscBookFs(List<ZwscBookFs> zwscBookFs) {
this.zwscBookFs = zwscBookFs;
}
DAO代码：
public <T>List<T> findBySqlAddClass( String sql , Class<T> entityClass) {
Session session = super.getSession();
Query query = session.createSQLQuery(sql).addEntity(entityClass);
List<Class<T>> list = query.list();
releaseSession(session);
return (List<T>) list;
}
执行query.list()的时候报错，我怀疑级联查询的时候有问题。但是不是每次都出错。
求大神帮忙。
