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cowwoc
 Post subject: LazyInitializationException: cannot access loading collectio
PostPosted: Fri Apr 29, 2005 12:01 am 
Senior
Senior

Joined: Tue Mar 02, 2004 6:17 pm
Posts: 151
Aparently my code is doing something that freaks out Hibernate's lazy-loading proxy. At runtime I get this exception:

Code:
Exception occurred inside setter of com.be.desktopbeautifier.shared.AbstractTheme.parent
org.hibernate.PropertyAccessException: Exception occurred inside setter of com.be.desktopbeautifier.shared.AbstractTheme.parent
        at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:51)
        at org.hibernate.tuple.AbstractTuplizer.setPropertyValues(AbstractTuplizer.java:207)
        at org.hibernate.tuple.PojoTuplizer.setPropertyValues(PojoTuplizer.java:171)
        at org.hibernate.persister.entity.BasicEntityPersister.setPropertyValues(BasicEntityPersister.java:2923)
        at org.hibernate.engine.TwoPhaseLoad.initializeEntity(TwoPhaseLoad.java:113)
        at org.hibernate.loader.Loader.initializeEntitiesAndCollections(Loader.java:494)
        at org.hibernate.loader.Loader.doQuery(Loader.java:413)
        at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:208)
        at org.hibernate.loader.Loader.loadCollection(Loader.java:1367)
        at org.hibernate.loader.collection.BatchingCollectionInitializer.initialize(BatchingCollectionInitializer.java:52)
        at org.hibernate.persister.collection.AbstractCollectionPersister.initialize(AbstractCollectionPersister.java:488)
        at org.hibernate.event.def.DefaultInitializeCollectionEventListener.onInitializeCollection(DefaultInitializeCollectionEventListener.java:60)
        at org.hibernate.impl.SessionImpl.initializeCollection(SessionImpl.java:1356)
        at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:171)
        at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:48)
        at org.hibernate.collection.PersistentSet.iterator(PersistentSet.java:134)
        at com.be.desktopbeautifier.server.DefaultClientTheme.deepCopyOfDescendants(DefaultClientTheme.java:64)
        at com.be.desktopbeautifier.server.DefaultClientTheme.deepCopy(DefaultClientTheme.java:45)
        at com.be.desktopbeautifier.servlet.GetNextImages.getThemeTree(GetNextImages.java:153)
        at com.be.desktopbeautifier.servlet.GetNextImages.processRequest(GetNextImages.java:89)
        at com.be.desktopbeautifier.servlet.GetNextImagesTest.testProcessRequest(GetNextImagesTest.java:112)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at org.apache.cactus.internal.AbstractCactusTestCase.runBareServer(AbstractCactusTestCase.java:153)
        at org.apache.cactus.internal.server.AbstractWebTestCaller.doTest(AbstractWebTestCaller.java:119)
        at org.apache.cactus.internal.server.AbstractWebTestController.handleRequest_aroundBody0(AbstractWebTestController.java:93)
        at org.apache.cactus.internal.server.AbstractWebTestController.handleRequest_aroundBody1$advice(AbstractWebTestController.java:224)
        at org.apache.cactus.internal.server.AbstractWebTestController.handleRequest(AbstractWebTestController.java)
        at org.apache.cactus.server.ServletTestRedirector.doPost_aroundBody2(ServletTestRedirector.java:101)
        at org.apache.cactus.server.ServletTestRedirector.doPost_aroundBody3$advice(ServletTestRedirector.java:224)
        at org.apache.cactus.server.ServletTestRedirector.doPost(ServletTestRedirector.java)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
        at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
        at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
        at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
        at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at org.hibernate.property.BasicPropertyAccessor$BasicSetter.set(BasicPropertyAccessor.java:40)
        ... 50 more
Caused by: org.hibernate.LazyInitializationException: cannot access loading collection
        at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:168)
        at org.hibernate.collection.AbstractPersistentCollection.write(AbstractPersistentCollection.java:61)
        at org.hibernate.collection.PersistentSet.add(PersistentSet.java:158)
        at com.be.desktopbeautifier.shared.AbstractTheme.add(AbstractTheme.java:151)
        at com.be.desktopbeautifier.shared.AbstractTheme.setParent(AbstractTheme.java:123)
        ... 55 more



Basically what is happening is that I have a tree structure. When Node.setParent() is invoked -- connecting it to its parent node -- it invokes parent.add(child) -- connecting it from the other direction as well. When Hibernate sees this "parent.add(child)" call it freaks out and complains with the above exception. I think it's trying to imply that I am accessing a lazy collection before it has been fully loaded.

What is the proposed workaround? Off the top of my head, I can't think up of another way of doing this. First, I need to understand what Hibernate is doing and why it is freaking out, then I will try refactoring my code.

Let me know if you have any idea.

Thank you,
Gili
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cowwoc
 Post subject:
PostPosted: Fri Apr 29, 2005 12:21 am 
Senior
Senior

Joined: Tue Mar 02, 2004 6:17 pm
Posts: 151
I should point out that both the "parent" and "children" properties map to the same column. To see what I mean, check out my mapping file:

Code:
<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-mapping PUBLIC
  "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
  "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.be.desktopbeautifier.server">
  <class name="Theme" table="theme">
    <id name="id">
      <generator class="native"/>
    </id>
    <discriminator column="class"/>
    <version name="version"/>
   
    <property name="name" type="java.lang.String" not-null="true"/>   
   
    <set name="children" cascade="all" sort="unsorted">
      <key>
        <column name="parent_id"/>
      </key>     
      <one-to-many class="Theme"/>
    </set>

    <many-to-one name="parent" column="parent_id" class="Theme"
    cascade="all"/>   

    <subclass name="AbstractTheme">
       <subclass name="DefaultTheme"/>
    </subclass>
  </class>
</hibernate-mapping>
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cowwoc
 Post subject:
PostPosted: Fri Apr 29, 2005 2:14 am 
Senior
Senior

Joined: Tue Mar 02, 2004 6:17 pm
Posts: 151
I've modified my mapping file in order to represent "parent" and "children" as a bidirectional one-to-many mapping. Unfortunately, I am still getting the same error. The new mapping file follows:

Code:
<?xml version="1.0" encoding="UTF-8"?>

<!--
    Document   : Theme.hbm.xml
    Created on : April 27, 2005, 11:43 AM
-->

<!DOCTYPE hibernate-mapping PUBLIC
  "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
  "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.be.desktopbeautifier.server">
  <class name="Theme" table="theme">
    <id name="id">
      <generator class="native"/>
    </id>
    <discriminator column="class"/>
    <version name="version"/>
   
    <property name="name" type="java.lang.String" not-null="true"/>   
   
    <set name="children" cascade="all" sort="unsorted" inverse="true">
      <key not-null="true">
        <column name="parent_id"/>
      </key>     
      <one-to-many class="Theme"/>
    </set>

    <many-to-one name="parent" column="parent_id" class="Theme"
    cascade="all"/>

    <subclass name="AbstractTheme">
       <subclass name="DefaultTheme"/>
    </subclass>
  </class>
</hibernate-mapping>
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cowwoc
 Post subject:
PostPosted: Fri Apr 29, 2005 9:56 am 
Senior
Senior

Joined: Tue Mar 02, 2004 6:17 pm
Posts: 151
Removed not-null="true" from children property because I don't think it is allowed for one end of the association to allow null and the other not to when both point to the same column in the same table -- am I wrong?

Now the definition of the column should be identical on both ends. It still does not work though.
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cowwoc
 Post subject:
PostPosted: Fri Apr 29, 2005 3:11 pm 
Senior
Senior

Joined: Tue Mar 02, 2004 6:17 pm
Posts: 151
Solved by giving Hibernate a different getter/setter than end-users. The Hibernate method does not try to set the children from setParent() or parent from addChild(), removeChild()... Hibernate seems happy with it.

Gili
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