illegal access to loading collection

jamesconf · **Joined:** Fri Jun 02, 2006 2:49 pm **Posts:** 13

I am attemptying to make my collection non-lazy(and thus initilize all the elemtns), so I can pass it off to a swing interface.
Viewing the logs I can see hibernate placing items into the collection elements (EnumerationOptions)

DEBUG [org.hibernate.engine.TwoPhaseLoad] done materializing entity [com.EnumerationOptions#1336]

I also get

DEBUG [org.hibernate.engine.CollectionLoadContext] 15 collections were found in result set for role: com.EnumerationTypes.options

and directly after

ERROR [org.hibernate.LazyInitializationException] illegal access to loading collection
org.hibernate.LazyInitializationException: illegal access to loading collection

I use this to retrive the enumerationTypes

Session session = factory.openSession();
Criteria criteria = session.createCriteria(EnumerationTypes.class);
criteria.add( Restrictions.eq("tableName",tableName));
criteria.list();

The exception is throw during the .list() call.

I am using this as my mapping file

<hibernate-mapping>
<class name="com.EnumerationTypes" table="ENUMERATION_TYPES" lazy="false">
<id name="id" column="ID"/>
<property name="tableName" type="java.lang.String" column="TABLE_NAME"/>
<property name="columnName" type="java.lang.String" column="COLUMN_NAME"/>

<set name="options" batch-size="30" lazy="false">
<key column="TYPE_ID"/>
<one-to-many class="com.EnumerationOptions"/>
</set>
</class>
<class name="com.EnumerationOptions" table="ENUMERATION_OPTIONS">
<id name="id" column="ID"/>
<property name="name" type="java.lang.String">
<column name="NAME"/>
</property>
<property name="description" type="java.lang.String">
<column name="DESCRIPTION"/>
</property>

<property name="bitValue" type="java.lang.Integer">
<column name="BITVALUE"/>
</property>
<property name="visible" type="java.lang.Integer">
<column name="VISIBLE"/>
</property>

<many-to-one name="type" column="TYPE_ID" class="com.EnumerationTypes"/>
</class>
</hibernate-mapping>

I have looked all day and still have no idea what "illegal access to loading collection" means. I did look through some source and saw it is thrown when a collection is initialized while it's being initialized by something else.

tenwit · **Joined:** Thu Dec 23, 2004 9:08 pm **Posts:** 2008

That means that you have an interceptor or event handler that's modifying the set as it's being loaded, or there's a set method in the class that's inside the collection that modifies the element on load, or maybe that the set method in the containing class modifies the collection during the set. The collection is set into the containing class when it's created; it might not be fully loaded at that point.

If it's not an interceptor or event handler, check all your set methods. They shouldn't do anything except set the parameter into the member. Stuff like this is not allowed:

Code:

public void setCollection(Collection col)
{
  this.col = col;
  this.col.add(new Thing("This is a placeholder"));
}

That modifies the collection, even though the collection hasn't yet been loaded.

jamesconf · **Joined:** Fri Jun 02, 2006 2:49 pm **Posts:** 13

I started looking into what would cause the class to be modifyed, I finely found it in the hashCode function. I was using HashCodeBuilder.reflectionHashCode()... and this is a bi-direction relationship.

Oddly the person who used the hashCode function says it was recomended in the hibernate docs.

tenwit · **Joined:** Thu Dec 23, 2004 9:08 pm **Posts:** 2008

The hashCode function is: there are many classes that must implement it (composite id classes and classes to be put into sets, for example). However, an automated hashcode calculator that works using reflection shouldn't be recommended anywhere. It's too likely to try to traverse the entire graph of connected entities, or else get stuck on an uninstantiated CGLib proxy object.