小贝子编程

LazyInitializationException



我有实体配置文件和一组 ProfileConstraintSetEntity

@Entity
@Table(name = "tbl_group_profile")
public class ProfileEntity {
        @Id
        @GeneratedValue
        @Column(name = "group_profile_id")
        private long id;
        @Column(name = "title")
        private String title;
        @OneToMany(mappedBy = "profile")
        private Set<ProfileConstraintSetEntity> constraintSets = new HashSet<ProfileConstraintSetEntity>();

ProfileConstraintSetEntity 如下所示： 

@Entity
@Table(name = "tbl_profile_constraint_or")
public class ProfileConstraintSetEntity {
    @Id
    @GeneratedValue
    @Column(name = "profile_constraint_or_id")
    private long id;
    @ManyToOne
    @JoinColumn(name = "group_profile_id", insertable = false, updatable = false)
    private ProfileEntity profile;
    @OneToMany(fetch = FetchType.EAGER)
    @JoinColumn(name = "profile_constraint_or_id")
    private Set<GroupConstraintEntity> constraints;

GroupConstraintEntity 如下所示： 

@Entity
@Table(name = "tbl_profile_group_constraint")
public class GroupConstraintEntity {
    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "profile_constraint_or_id", insertable = false, updatable = false)
    private ProfileConstraintSetEntity constraintSet;
    @ManyToOne
    @JoinColumn(name = "cp_group_id", insertable = false, updatable = false)
    private CpGroupEntity group;
    @Column(name = "constraint_type")
    @Enumerated(EnumType.STRING)
    private GroupConstraintType type;

两个实体都有一个hashcode（）和一个equals（）方法。但是如果我执行这个：

// Get profile entity
ProfileEntity entity = profileDAO.getProfile(id);
// Syso for test
System.out.println(entity.getId());
System.out.println(entity.getTitle());
for (ProfileConstraintSetEntity profileConstraintSetEntity : entity.getConstraintSets()) {
    // Syso for test
    System.out.println(profileConstraintSetEntity.getId());
    System.out.println(profileConstraintSetEntity.getProfile().getId());
}

这里是DAO函数来获取配置文件： 

public ProfileEntity getProfile(long id) throws NoSuchProfileException {
    try {
        ProfileEntity result = entityManager.getReference(ProfileEntity.class, id);
        // Trigger EntityNotFoundException now, in case of lazy fetching
        result.getTitle();
        return result;
    } catch (EntityNotFoundException e) {
        throw new NoSuchProfileException("Unknown group profile ID " + id);
    }
}

它仅执行第一个 Syso 测试，并退出并使用以下堆栈跟踪：

Okt 28, 2013 11:23:23 AM com.sun.jersey.spi.container.ContainerResponse mapMappableContainerException
SEVERE: The RuntimeException could not be mapped to a response, re-throwing to the HTTP container
org.hibernate.LazyInitializationException: illegal access to loading collection
at org.hibernate.collection.internal.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:377)
at org.hibernate.collection.internal.AbstractPersistentCollection.read(AbstractPersistentCollection.java:113)
at org.hibernate.collection.internal.PersistentSet.hashCode(PersistentSet.java:428)
at net.erouting.db.groups.ProfileConstraintSetEntity.hashCode(ProfileConstraintSetEntity.java:59)
at java.util.HashMap.hash(HashMap.java:351)
at java.util.HashMap.put(HashMap.java:471)
at java.util.HashSet.add(HashSet.java:217)
at java.util.AbstractCollection.addAll(AbstractCollection.java:334)
at org.hibernate.collection.internal.PersistentSet.endRead(PersistentSet.java:346)
at org.hibernate.engine.loading.internal.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:243)
at org.hibernate.engine.loading.internal.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:233)
at org.hibernate.engine.loading.internal.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:210)
at org.hibernate.loader.Loader.endCollectionLoad(Loader.java:1018)
at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:1006)
at org.hibernate.loader.Loader.doQuery(Loader.java:874)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:289)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
at org.hibernate.loader.Loader.loadEntity(Loader.java:2033)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:82)
at org.hibernate.loader.entity.AbstractEntityLoader.load(AbstractEntityLoader.java:72)
at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:3719)
at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:449)
at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:418)
at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:204)
at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:143)
at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1079)
at org.hibernate.internal.SessionImpl.immediateLoad(SessionImpl.java:994)
at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:158)
at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:195)
at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:185)
at net.erouting.db.groups.ProfileEntity_$$_javassist_17.getTitle(ProfileEntity_$$_javassist_17.java)
at net.erouting.db.groups.ProfileDAO.getProfile(ProfileDAO.java:22)
at net.erouting.admin.ProfileManager.getProfile(ProfileManager.java:55)
at net.erouting.admin.ProfileManager$$FastClassByCGLIB$$e2da60df.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 net.erouting.admin.ProfileManager$$EnhancerByCGLIB$$625d6c76.getProfile(<generated>)
at net.erouting.api.Profile.getProfile(Profile.java:85)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.sun.jersey.spi.container.JavaMethodInvokerFactory$1.invoke(JavaMethodInvokerFactory.java:60)
at com.sun.jersey.server.impl.model.method.dispatch.AbstractResourceMethodDispatchProvider$ResponseOutInvoker._dispatch(AbstractResourceMethodDispatchProvider.java:205)
at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75)
at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:288)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108)
at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147)
at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1483)
at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1414)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1363)
at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1353)
at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:414)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:537)
at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:708)
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.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$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.springframework.security.web.authentication.www.DigestAuthenticationFilter.doFilter(DigestAuthenticationFilter.java:209)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:323)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:173)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:259)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)

我尝试使用 

(fetch = FetchType.EAGER) and (fetch = FetchType.LAZY)
@PersistenceContext(type = PersistenceContextType.EXTENDED)

在实体的集合中

我做错了什么？

更新 *：如果我在配置文件约束集实体中注释掉它：

//  @OneToMany(fetch = FetchType.EAGER)
//  @JoinColumn(name = "profile_constraint_or_id")
//  private Set<GroupConstraintEntity> constraints;

执行两个系统测试块。所以我认为错误一定是在这个属性的配置中。但我不明白。

将

ProfileEntity 中的@OneToMany映射更改为：

@Entity
@Table(name = "tbl_group_profile")
public class ProfileEntity {
...
@OneToMany(mappedBy = "profile", fetch = FetchType.LAZY)
private Set<ProfileConstraintSetEntity> constraintSets;
....
}

将默认提取模式保留为 FetchType.LAZY 。如果使用 EAGER 获取，它将始终提取constraintSets，即使不需要。

现在，只要需要，您就可以在代码中覆盖此默认行为，以便constraintSets可以与ProfileEntity一起加载。您可以将getProfile方法代码替换为以下内容：

Query query = entityManager.createQuery("select p from ProfileEntity p " +
            "left join fetch p.constraintSets where p.id=:id");
query.setParameter("id", id);
ProfileEntity profileEntity = (ProfileEntity) query.getResultList().get(0);

这将获取所选ProfileEntity的constraintSets。

编辑：

在ProfileConstraintSetEntity类中，更改Set<GroupConstraintEntity> constraints的映射：

@OneToMany(fetch = FetchType.EAGER, mappedBy = "constraintSet")
private Set<GroupConstraintEntity> constraints;

您不需要@JoinColumn带有constraints注释。

下面的映射在GroupConstraintEntity中表示您在tbl_profile_group_constraint中有一个用于存储关系的列profile_constraint_or_id。

@JoinColumn(name = "profile_constraint_or_id", insertable = false, updatable = false)
private ProfileConstraintSetEntity constraintSet;

你试过吗

ProfileEntity result =  (ProfileEntity) entityManager.find(ProfileEntity.class, id);
result.getTitle();
result.getConstraintSets().size();
return result;

而不是

entityManager.getReference(ProfileEntity.class, id);

我发现了错误。

当我使用列表而不是设置时，它工作得很好。但我不知道为什么。也许有人可以解释我，我必须做什么，它适用于集合。

感谢您的帮助！

此错误

意味着您正在尝试访问延迟加载的属性或集合，但休眠会话已关闭或不可用。

解决此问题的正确方法是使用 OpenSessionInViewFilter .

这是有关如何执行此操作的教程。

你可以尝试在web中添加.xml

<filter>
    <filter-name>OpenSessionInViewFilter</filter-name>
    <filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>OpenSessionInViewFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

芽 确保对您的应用程序有什么影响

源http://blog.gmorales.net/2012/03/how-to-solve-orghibernatelazyinitializa.html

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