LazyInitializationException

Question

I have the entity Profile with a set of 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>();

The ProfileConstraintSetEntity looks like this:

@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;

The GroupConstraintEntity looks like this:

@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;

Both entities hav a hashcode() and an equals() method. But if I execute this:

// 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());
}

Here the DAO function to get the Profile:

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);
    }
}

it only executes the first syso test and quits with the following stack trace:

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)

I tried to use

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

at the collections of the entities

What am I doing wrong?

UPDATE * : if I comment out this in the ProfileConstraintSetEntity:

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

Both sys test blocks are executed. So I think the Error must be in the configration of this propperty. But I don't get it.

Answer 1

Change the @OneToMany mapping in ProfileEntity to this:

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

Keep default fetch mode as FetchType.LAZY . If you use EAGER fetching, it will always fetch the constraintSets even though that is not needed.

Now wherever needed you can override this default behavior in code, so that constraintSets can be loaded along with the ProfileEntity . You can replace getProfile method code to this:

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);

this will fetch constraintSets of the selected ProfileEntity .

EDIT :

In the ProfileConstraintSetEntity class, change the mapping of Set<GroupConstraintEntity> constraints :

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

you don't need to have @JoinColumn annotation with constraints .

The below mapping that you have in GroupConstraintEntity says that you have a column profile_constraint_or_id in tbl_profile_group_constraint which stores the relationship.

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

Answer 2

Have you tried

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

instead of

entityManager.getReference(ProfileEntity.class, id);

Answer 3

I have found the error.

When I use Lists instead of Sets it works quite fine. But I don't know why. Perhaps someone can explain me, what I have to do, that it althouhj works with sets.

Thank you for your help!

Answer 4

This error means that you're trying to access a lazily-loaded property or collection, but the hibernate session is closed or not available.

The correct way to fix this is to use an OpenSessionInViewFilter .

Here is a tutorial on how to do that .

Answer 5

you can try to add in web.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>

bud make sure about whats the impact in your application

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