我得到了一个懒惰的初始化异常。 A有一个带有注释@Transactional的控制器方法，它调用一个服务方法（它没有@Transactional注释），最后在该方法中我调用另一个spring组件（它检查用户是否具有正确的角色）。
在项目中，我使用了@Transactional，我没有遇到任何问题。但在这种情况下，我有懒惰的初始化异常。
我错过了什么吗？
以下是代码：
这是首次执行的方法。它有@Transactional注释
@Transactional
public CompanyForm edit(){
CompanyForm form = new CompanyForm();
Company company = companyService.findMainOne(getLoggedUser());
if (company != null) {
if (company != null)
modelMapper.map(company, form);
}
return form;
}
这是代码被称为
的服务中的方法@Autowired
private UserVisitorHasBussinessRole hasBussinessRole;
@Override
public Company findMainOne(User user) {
if (user == null)
throw new NullPointerException("the user can not be null");
user.accept(hasBussinessRole);
List<Company> companies = this.companyRepository.findOwnedBy(user
.getId());
if (companies != null && companies.size() > 0)
return companies.get(0);
return null;
}
此组件检查用户是否具有适当的角色。这是我得到例外的地方
@Component
public class UserVisitorHasBussinessRole implements UserVisitor {
@Autowired
private Messages messages;
@Override
public void visit(SystemUser user) {
if(user == null || user.getUserRoles() == null || user.getUserRoles().isEmpty())
{
String message = messages.get("hasBussinesRoleVisitor.noRole");
throw new RuntimeException(message);
}
Boolean hasRole = false;
for (UserRole role : user.getUserRoles()) {
if(role instanceof UserRoleBusiness){
hasRole = true;
break;
}
}
if(!hasRole)
{
String message = messages.get("hasBussinesRoleVisitor.noRole");
throw new RuntimeException(message);
}
}
@Override
public void visit(SocialUser user) {
String message = messages.get("hasBussinesRoleVisitor.noRole");
throw new RuntimeException(message);
}
}
这是引发异常的地方
user.getUserRoles().isEmpty()
实体：
@Entity
@DiscriminatorValue(value = "BU")
public class SystemUser extends User {
/**
*
*/
private static final long serialVersionUID = 3845147625976106863L;
// for joing the tables (many-to-many)
@ManyToMany(cascade = CascadeType.ALL, targetEntity = UserRole.class)
@JoinTable(name = "systemUser_userRole", joinColumns = { @JoinColumn(name = "system_user_id") }, inverseJoinColumns = { @JoinColumn(name = "role_Id") })
private List<UserRole> userRoles;
/**
* the list of user roles
* @return the user roles
*/
public List<UserRole> getUserRoles() {
return userRoles;
}
/***
* set the list of user roles
* @param userRoles the user roles
*/
public void setUserRoles(List<UserRole> userRoles) {
this.userRoles = userRoles;
}
}
我收到以下异常
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at ar.com.held.model.user.User.accept(Unknown Source)
at ar.com.held.service.implementation.CompanyServiceImpl.findMainOne(Unknown Source)
at ar.com.held.service.implementation.CompanyServiceImpl$$FastClassByCGLIB$$d0027e0c.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:689)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.security.access.intercept.aopalliance.MethodSecurityInterceptor.invoke(MethodSecurityInterceptor.java:61)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:622)
at ar.com.held.service.implementation.CompanyServiceImpl$$EnhancerByCGLIB$$b15b3940_2.findMainOne(<generated>)
at ar.com.held.controller.CompanyFlowController.edit(CompanyFlowController.java:28)
at ar.com.held.controller.CompanyFlowController$$FastClassByCGLIB$$c3823c4.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:689)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:622)
at ar.com.held.controller.CompanyFlowController$$EnhancerByCGLIB$$5b3921c7_2.edit(<generated>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.springframework.expression.spel.support.ReflectiveMethodExecutor.execute(ReflectiveMethodExecutor.java:69)
at org.springframework.expression.spel.ast.MethodReference.getValueInternal(MethodReference.java:109)
at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:57)
at org.springframework.expression.spel.ast.SpelNodeImpl.getTypedValue(SpelNodeImpl.java:102)
at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:97)
at org.springframework.binding.expression.spel.SpringELExpression.getValue(SpringELExpression.java:84)
at org.springframework.webflow.action.EvaluateAction.doExecute(EvaluateAction.java:75)
at org.springframework.webflow.action.AbstractAction.execute(AbstractAction.java:188)
at org.springframework.webflow.execution.AnnotatedAction.execute(AnnotatedAction.java:145)
at org.springframework.webflow.execution.ActionExecutor.execute(ActionExecutor.java:51)
at org.springframework.webflow.engine.ActionList.execute(ActionList.java:155)
at org.springframework.webflow.engine.Flow.start(Flow.java:534)
at org.springframework.webflow.engine.impl.FlowExecutionImpl.start(FlowExecutionImpl.java:366)
at org.springframework.webflow.engine.impl.FlowExecutionImpl.start(FlowExecutionImpl.java:225)
at org.springframework.webflow.executor.FlowExecutorImpl.launchExecution(FlowExecutorImpl.java:140)
at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:193)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:900)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:827)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:778)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
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 com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129)
at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:311)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:116)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:101)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter.doFilter(DefaultLoginPageGeneratingFilter.java:91)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:182)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:173)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: ar.com.held.model.user.SystemUser.userRoles, no session or session was closed
at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:393)
at org.hibernate.collection.internal.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:385)
at org.hibernate.collection.internal.AbstractPersistentCollection.readSize(AbstractPersistentCollection.java:125)
at org.hibernate.collection.internal.PersistentBag.isEmpty(PersistentBag.java:249)
at ar.com.held.service.implementation.visitor.UserVisitorHasBussinessRole.visit(Unknown Source)
... 100 more
答案 0 :(得分：3)
我使用@LazyCollection（LazyCollectionOption.FALSE）解决了
这是代码：
@ManyToMany(cascade = CascadeType.ALL, targetEntity = UserRole.class)
@JoinTable(name = "systemUser_userRole", joinColumns = { @JoinColumn(name = "system_user_id") }, inverseJoinColumns = { @JoinColumn(name = "role_Id") })
@LazyCollection(LazyCollectionOption.FALSE)
private List<UserRole> userRoles;
这不是最好的解决方案，但它有效。问题是LazyCollection注释是一个Hibernate注释而不是jpa之一。
感谢所有
答案 1 :(得分：2)
当原始事务已经完成时读取延迟初始化对象时会发生这种情况。换句话说，当您从带有@Transactional注释的方法返回某些内容时，必须初始化所有对象（从方法返回后无法访问延迟对象）。因此，在这种情况下使用lazy =“false”来解决问题（或强制在方法内部进行延迟初始化）。
答案 2 :(得分：0)
将@Transactional添加到findMainOne和visit(SystemUser)，以便他们都参与同一个事务，从而为他们提供对延迟加载相关组件的会话/实体管理器的访问权限。或者，您可以在调用findMainOne之前加载可能需要的组件。