Could someone help me out on why I get the following exeception when trying to access the users set on my company?

Thanks!

org.hibernate.LazyInitializationException: illegal access to loading collection

Hibernate version: 3.0

Mapping documents:
<hibernate-mapping>
<class name="com.myorg.model.Company" table="company">

<id name="id" type="integer" column="company_id" >
<generator class="native"/>
</id>
<property name="name" type="string" column="name" not-null="true"/>
<set name="users" inverse="true" lazy="true">
<key column="company_id"/>
<one-to-many class="com.myorg.model.User"/>
</set>



</class>
</hibernate-mapping>

<hibernate-mapping>
<class name="com.myorg.model.User" table="[user]">

<id name="id" type="integer" column="user_id" >
<generator class="native"/>
</id>
<property name="user_name" type="string" column="user_name" not-null="true" unique="true"/>
<property name="email" type="string" column="email" not-null="true" unique="true"/>
<property name="first_name" type="string" column="first_name" not-null="true"/>
<property name="last_name" type="string" column="last_name" not-null="true"/>
<property name="er_optin" type="boolean" column="er_optin" not-null="false"/>
<property name="fi_optin" type="boolean" column="fi_optin" not-null="false"/>
<property name="ib_pm_optin" type="boolean" column="ib_pm_optin" not-null="false"/>
<property name="ib_ms_optin" type="boolean" column="ib_ms_optin" not-null="false"/>
<property name="ib_ma_optin" type="boolean" column="ib_ma_optin" not-null="false"/>
<property name="password" type="string" column="password" not-null="true"/>
<property name="passwordExpDate" type="date" column="password_exp_date" not-null="false"/>

<many-to-one name="company" column="company_id" class="com.myorg.model.Company" not-null="true"/>

<set name="roles"
lazy="true"

table="user_role">
<key column="user_id"/>
<many-to-many column="role_id" class="com.myorg.model.Role"/>
</set>

</class>
</hibernate-mapping>





Code between sessionFactory.openSession() and session.close():
Company company = (Company) getHibernateTemplate().get(Company.class, id);
Set users = company.getUsers();
int len = users.size();


Full stack trace of any exception that occurs:
org.hibernate.LazyInitializationException: illegal access to loading collection
[org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:172), org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:48), org.hibernate.collection.PersistentSet.hashCode(PersistentSet.java:324), org.apache.commons.lang.builder.HashCodeBuilder.append(HashCodeBuilder.java:297), org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:270), org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:200), org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:177), com.myorg.model.BaseObject.hashCode(BaseObject.java:27), org.apache.commons.lang.builder.HashCodeBuilder.append(HashCodeBuilder.java:297), org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:270), org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:200), org.apache.commons.lang.builder.HashCodeBuilder.reflectionHashCode(HashCodeBuilder.java:177), com.myorg.model.BaseObject.hashCode(BaseObject.java:27), java.util.HashMap.hash(Unknown Source), java.util.HashMap.put(Unknown Source), java.util.HashSet.add(Unknown Source), java.util.AbstractCollection.addAll(Unknown Source), org.hibernate.collection.PersistentSet.endRead(PersistentSet.java:242), org.hibernate.engine.CollectionLoadContext.endLoadingCollection(CollectionLoadContext.java:183), org.hibernate.engine.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:268), org.hibernate.engine.CollectionLoadContext.endLoadingCollections(CollectionLoadContext.java:249), org.hibernate.loader.Loader.endCollectionLoad(Loader.java:554), org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:541), org.hibernate.loader.Loader.doQuery(Loader.java:436), org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:218), org.hibernate.loader.Loader.loadCollection(Loader.java:1434), org.hibernate.loader.collection.OneToManyLoader.initialize(OneToManyLoader.java:111), org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:488), org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60), org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1430), org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:176), org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:48), org.hibernate.collection.PersistentSet.size(PersistentSet.java:110), com.myorg.dao.hibernate.CompanyDAOHibernate.get(CompanyDAOHibernate.java:103), com.myorg.service.impl.CompanyServiceImpl.getCompany(CompanyServiceImpl.java:27), sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method), sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source), sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source), java.lang.reflect.Method.invoke(Unknown Source), org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:287), org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:181), org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:148), org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96), org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:170), org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:176), $Proxy2.getCompany(Unknown Source), com.myorg.web.CompanyAction.edit(CompanyAction.java:105), sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method), sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source), sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source), java.lang.reflect.Method.invoke(Unknown Source), org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:270), org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:187), org.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:106), org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431), org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236), org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196), org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432), javax.servlet.http.HttpServlet.service(HttpServlet.java:709), javax.servlet.http.HttpServlet.service(HttpServlet.java:802), org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252), org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173), com.myorg.web.common.AuthorizationFilter.doFilter(AuthorizationFilter.java:105), org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202), org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173), org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:174), org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77), org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202), org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173), org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213), org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178), org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126), org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105), org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107), org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148), org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869), org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664), org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527), org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80), org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684), java.lang.Thread.run(Unknown Source)



DB: SQL Server 2005

<hibernate-mapping>
<class name="com.myorg.model.Company" table="company">

<id name="id" type="integer" column="company_id" >
<generator class="native"/>
</id>
<property name="name" type="string" column="name" not-null="true"/>
<set name="users" inverse="true" lazy="true">
<key column="company_id"/>
<one-to-many class="com.myorg.model.User"/>
</set>

You are asking it to fetch the users lazily so whenever you try to access any property of the user from the set other than the Primary Key property it will throw you that exception. Please make the following change to the HBM file

<hibernate-mapping>
<class name="com.myorg.model.Company" table="company" lazy="false">

<id name="id" type="integer" column="company_id" >
<generator class="native"/>
</id>
<property name="name" type="string" column="name" not-null="true"/>
<set name="users" inverse="true" lazy="false" outer-join="true">
<key column="company_id"/>
<one-to-many class="com.myorg.model.User"/>
</set>


Let me know whether it works. There is a another alternative solution for the problem: add the following to the Java code:




Also please inform me whether this works.
Thank you[/code]

Thanks for the quick response, but no that did not.

Just on an FYI too... I believe what you are stating there is incorrect. Lazy loading loading simply means that the set will not be loaded unless it is accessed. This will happen automatically when you access the set and will work without any extra effort as long as the session associated with it is still open (it's why Hibernate uses its own implementation of Sets). In my case I'm getting an illegal access exception while lazy loading (meaning that the session is open and trying to load but something is messing with my set while that's happening) and it can't load it up.

The exception JavaDoc says the following,

You probably saw that. That is why I said what I said. Never mind, what I said about Lazy fetching is assuming that the session was closed beforehand.

I got such error another time, it was when the Hibernate.initialize() or load or get was used to fetch an child attribute that can not fetched as it does not exist. Its just a guess. I found out this by printing the key of the object to be fetched lazily before I try to access any other property.
Please let me know once you solve the problem.

Thank you.

OK... so my problem was this: someone on our team put a hashcode builder (org.apache.commons.lang.builder.HashCodeBuilder) in our base model object so that any object that inherits from it would produce a hashcode without any additional code at the child objects.

Sounds nice, but when loading a set of an object that uses this builder for its hash code, it causes illegal access exceptions. Guess you just need to build that hashcode manually if you need one (i.e. can't just get away the session keeping track of the object).

There was nothing wrong with HashCode in my case. The problem was in a database data itself. For some reason referenced records had been deleted from the table, so, I got a circumstances when record in one table contains reference to a record that is not exists in another table.
Interesting, but collection I was trying to get was not related to any of "broken" reference.
I solved the problem by adding not-found="ignore"



Another reason why you might have this exception is one of the object in a collection that can't be initialized (missing required data or referenced object is not found). That causes the entire collection fail to initialize.

I had the same issue.

As "paulj" said, hashcode what my issue also.
I had a Set in the hashcode calculation. I removed the Set from the hashcode and now this error Gone !!.

Thanks paulj.