Lazy instantiation problem with template generation

marco-p · **Posted:** Thu Apr 07, 2005 10:23 am

Hi, I'm having a problem with lazy instantiation when using a template engine (WebMacro). I'm getting sometimes the error

Code:

16:17:08,939 ERROR LazyInitializationException:19 - could not initialize proxy - the owning Session was closed
org.hibernate.LazyInitializationException: could not initialize proxy - the owning Session was closed
        at org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:53)
        at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:80)
        at org.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:134)
        at ejb.catalog.Autore$$EnhancerByCGLIB$$1390b281.getNome(<generated>)
        at sun.reflect.GeneratedMethodAccessor89.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at org.webmacro.engine.PropertyOperator.invoke(PropertyOperatorCache.java:864)
        at org.webmacro.engine.UnaryMethodAccessor.get(PropertyOperatorCache.java:1230)
        at org.webmacro.engine.PropertyOperator.getProperty(PropertyOperatorCache.java:651)
        at org.webmacro.engine.PropertyOperatorCache.getProperty(PropertyOperatorCache.java:142)
        at org.webmacro.Context.internalGet(Context.java:387)
        at org.webmacro.Context.getProperty(Context.java:439)
...

I'm using Hibernate 3 final and I've configured it to bind the session factory to JNDI. I use a filter to close the session after the last servlet complete the execution.
Where should I look for hints on this problem ?
TIA[/code]

marco-p · **Posted:** Thu Apr 07, 2005 10:28 am

More info on this:

Object HBM:

Code:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >

<hibernate-mapping>

<class
    name="ejb.catalog.Articolo"
    table="ARTICOLO"
>
    <meta attribute="extends">ejb.catalog.AbstractArticolo</meta>
    <cache usage="read-write" />
    <id
        name="id"
        type="java.lang.String"
        column="ID"
    >
        <generator class="assigned" />
    </id>
(some properties)
    <many-to-one
        name="autore"
        class="ejb.catalog.Autore"
        not-null="true"
    >
        <column name="AUTOREID" />
    </many-to-one>
</class>
(some named queries)
</hibernate-mapping>

marco-p · **Posted:** Thu Apr 07, 2005 11:38 am

Ok, I think I've solved the problem: I was using a local cache for search results, so the pojo where referring to the session closed in the previous request.