LazyInitializationException [spring + struts2]

[Oron Subayi]

Hello
I don't know what to do : )
I have a db with data, and I wanted to get a Branch object, but I get LazyInitializationException, because the object has references to other objects inside.
I also have a class named AbstractDAO, which all specific DAOs extend, and I want it to work with HibernateTemplate, but I can't make spring inject the SessionFactory object.

Please help : /
Here are the files:

Branch:

public class Branch implements Serializable
{
	private static final int NUMBER_OF_PREVIEW_IMAGES = 3;

	private static final long serialVersionUID = 3523739943767798470L;

	private Long id;
	private String description;
	private float rank = 0;
	private int numVoters = 0;
	private int minAge = 0;
	private int maxAge = 0;
	private List<ContactInformation> contactsDetails = new LinkedList<ContactInformation>();
	private List<Event> events = new LinkedList<Event>();
	private BranchPhoto[] images = new BranchPhoto[NUMBER_OF_PREVIEW_IMAGES];
	private boolean isWifiAvailable = true;
	private boolean isSmokingAllowed = true;
	private boolean isHandicapAccessible = true;
	private boolean isKosher = true;
	private Address address;
	private Place place;

	public Branch()
	{
	}

	public String getDescription()
	{
		return description;
	}

	public void setDescription(String description)
	{
		this.description = description;
	}

	public float getRank()
	{
		return rank;
	}

	public void setRank(float rank)
	{
		this.rank = rank;
	}

	public int getNumVoters()
	{
		return numVoters;
	}

	public void setNumVoters(int numVoters)
	{
		this.numVoters = numVoters;
	}

	public int getMinAge()
	{
		return minAge;
	}

	public void setMinAge(int minAge)
	{
		this.minAge = minAge;
	}

	public int getMaxAge()
	{
		return maxAge;
	}

	public void setMaxAge(int maxAge)
	{
		this.maxAge = maxAge;
	}

	public BranchPhoto[] getImages()
	{
		return images;
	}

	public void setImages(BranchPhoto[] imagesURL)
	{
		this.images = imagesURL;
	}

	public boolean getIsWifiAvailable()
	{
		return isWifiAvailable;
	}

	public void setIsWifiAvailable(boolean isWifiAvailable)
	{
		this.isWifiAvailable = isWifiAvailable;
	}

	public boolean getIsSmokingAllowed()
	{
		return isSmokingAllowed;
	}

	public void setIsSmokingAllowed(boolean isSmokingAllowed)
	{
		this.isSmokingAllowed = isSmokingAllowed;
	}

	public boolean getIsHandicapAccessible()
	{
		return isHandicapAccessible;
	}

	public void setIsHandicapAccessible(boolean isHandicapAccessible)
	{
		this.isHandicapAccessible = isHandicapAccessible;
	}

	public boolean getIsKosher()
	{
		return isKosher;
	}

	public void setIsKosher(boolean isKosher)
	{
		this.isKosher = isKosher;
	}

	public Address getAddress()
	{
		return address;
	}

	public void setAddress(Address address)
	{
		this.address = address;
	}

	public List<ContactInformation> getContactsDetails()
	{
		return contactsDetails;
	}

	public void setContactsDetails(List<ContactInformation> contactsDetails)
	{
	    this.contactsDetails = contactsDetails;
	}

	public void setEvents(List<Event> events)
	{
	    this.events = events;
	}
	
	public List<Event> getEvents()
	{
		return events;
	}

	public Long getId()
	{
	    return id;
	}

	public void setId(Long id)
	{
	    this.id = id;
	}

	public Place getPlace()
	{
	    return place;
	}

	public void setPlace(Place place)
	{
	    this.place = place;
	}
	
	public void addContact(ContactInformation contactInformation)
	{
		contactsDetails.add(contactInformation);
		contactInformation.setBranch(this);
	}
	
	public void addEvent(Event event)
	{
		events.add(event);
		event.setBranch(this);
	}
}

AbstractDAO (I want to change this class):

public abstract class AbstractDAO implements DAO
{
    private Session session;
    private Transaction tx;
    protected HibernateTemplate hibernateTemplate;

    public AbstractDAO()
    {
	HibernateUtil.buildIfNeeded();
    }

    public void saveOrUpdate(Object obj)
    {
	try
	{
	    startOperation();
	    session.saveOrUpdate(obj);
	    tx.commit();
	}
	catch (HibernateException e)
	{
	    handleException(e);
	}
	finally
	{
	    HibernateUtil.close(session);
	}
    }

    public void save(Object obj)
    {
	try
	{
	    startOperation();
	    session.save(obj);
	    tx.commit();
	}
	catch (HibernateException e)
	{
	    handleException(e);
	}
	finally
	{
	    HibernateUtil.close(session);
	}
    }

    public void delete(Object obj)
    {
	try
	{
	    startOperation();
	    session.delete(obj);
	    tx.commit();
	}
	catch (HibernateException e)
	{
	    handleException(e);
	}
	finally
	{
	    HibernateUtil.close(session);
	}
    }

    public Object find(Object obj, Long id)
    {
	try
	{
	    startOperation();
	    obj = session.load(obj.getClass(), id);
	    tx.commit();
	}
	catch (HibernateException e)
	{
	    handleException(e);
	}
	finally
	{
	    HibernateUtil.close(session);
	}
	return obj;
    }

    @SuppressWarnings("unchecked")
    public List<Object> findAll(Object obj)
    {
	List<Object> objects = null;
	try
	{
	    startOperation();
	    Query query = session.createQuery("from "
		    + obj.getClass().getName());
	    objects = query.list();
	    tx.commit();
	}
	catch (HibernateException e)
	{
	    handleException(e);
	}
	finally
	{
	    HibernateUtil.close(session);
	}
	return objects;
    }

    public void handleException(HibernateException e)
	    throws DataAccessLayerException
    {
	HibernateUtil.rollback(tx);
	throw new DataAccessLayerException(e);
    }

    public void startOperation() throws HibernateException
    {
	session = HibernateUtil.openSession();
	tx = session.beginTransaction();
    }

    public SessionFactory getSessionFactory()
    {
	return hibernateTemplate.getSessionFactory();
    }

    public void setSessionFactory(SessionFactory sessionFactory)
    {
	this.hibernateTemplate = new HibernateTemplate(sessionFactory);
    }
}

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4"
	xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
	<display-name>HangOutWeb</display-name>
	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>index.jsp</welcome-file>
		<welcome-file>default.html</welcome-file>
		<welcome-file>default.htm</welcome-file>
		<welcome-file>default.jsp</welcome-file>
	</welcome-file-list>
	
	<!-- Spring -->
	<listener>
		<!-- Required for the struts2 spring plugin to work -->
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	<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>
	
	<!-- SiteMesh Configuration-->
	<filter>
		<filter-name>sitemesh</filter-name>
		<filter-class>com.opensymphony.module.sitemesh.filter.PageFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>sitemesh</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	
	<!-- Struts Configuration - Must be after sitemesh -->
	<filter>
		<filter-name>struts2</filter-name>
		<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>struts2</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
</web-app>

applicationContext:

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="
       http://www.springframework.org/schema/beans 
       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       http://www.springframework.org/schema/tx 
       http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
       http://www.springframework.org/schema/aop 
       http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
	<bean id="sessionFactory" scope="singleton"
		class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
		<property name="configLocation" value="classpath:hibernate.cfg.xml" />
	</bean>
	<bean id="transactionManager"
		class="org.springframework.orm.hibernate3.HibernateTransactionManager">
		<property name="sessionFactory" ref="sessionFactory" />
	</bean>
	
	<bean id="branchDAO" class="org.softwarelabs.hangout.model.hibernate.BranchDAOHibernate">
		<property name="sessionFactory" ref="sessionFactory" />
	</bean>
</beans>

BranchDAOHibernate:

public class BranchDAOHibernate extends AbstractDAO implements BranchDAO
{
    @Override
    public Branch getBranchById(Long branchId)
    {
	Branch branchFound = new Branch();
	
	branchFound = (Branch)find(branchFound, branchId);

	return branchFound;
    }

}

struts.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
	<package name="mobile" namespace="/mobile" extends="json-default">
		<action name="getBranchById" class="actions.mobile.BranchById">
			<result type="json"/>
		</action>
	</package>
	
	<package name="web" namespace="/" extends="struts-default">
		<action name="home">
			<result>/WEB-INF/pages/home.jsp</result>
		</action>
	</package>
</struts>

BranchById (Struts Action):

public class BranchById extends ActionSupport
{
    private static final long serialVersionUID = -6610905740966563067L;
    
    private Branch branch = null;
    private Long branchId;

    public String execute()
    {
	BranchDAO branchDAO = (BranchDAO)DAOFactory.getDAOBean(DAOFactory.BRANCH);
	branch = branchDAO.getBranchById(getBranchId());
	Logger.getLogger(Branch.class).info(getBranch());
	return SUCCESS;
    }

    public Long getBranchId()
    {
	return branchId;
    }

    public void setBranchId(Long branchId)
    {
	this.branchId = branchId;
    }

    public Branch getBranch()
    {
	return branch;
    }
    
}

[Pankaj Kumarkk]

I think you will have to ask a specific question like which method call is making the exception. Also the trace of exception would tell you the object for which you are getting this exception.
Typically you get this exception when you are accessing data from a hibernate pojo after the hibernate session has been closed. In your scenario the hibernate pojo has not been initialized and thus is just a proxy and thus accessing any data member would cause this exception.
There could be 2 solution to resolve this:
1. expand the scope of Hibernate session so that it is not closed till the time you have code to access the data
2. Eagerly load the hibernate object so that you can work with it in a detached fashion.

Option 2 should be mostly preferred.

[Oron Subayi]

Pankaj Kumarkk wrote:I think you will have to ask a specific question like which method call is making the exception. Also the trace of exception would tell you the object for which you are getting this exception.
Typically you get this exception when you are accessing data from a hibernate pojo after the hibernate session has been closed. In your scenario the hibernate pojo has not been initialized and thus is just a proxy and thus accessing any data member would cause this exception.
There could be 2 solution to resolve this:
1. expand the scope of Hibernate session so that it is not closed till the time you have code to access the data
2. Eagerly load the hibernate object so that you can work with it in a detached fashion.

Option 2 should be mostly preferred.

It is not exactly a method
When I call find() in BranchDAOHibernate, it brings me the branch, but the value of it's inner objects contains something weird (line 101 in stack trace), and when it tries to generate a json, the exception comes (I guess LOL)

Does the filter declared the web.xml shouldn't solve the issue you've mentioned?
<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>

lines 6 and 101

571237 [http-8080-2] ERROR org.hibernate.LazyInitializationException  - 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:60)
	at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:111)
	at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:140)
	at org.softwarelabs.hangout.model.Branch$$EnhancerByCGLIB$$50aea7bd.toString(<generated>)
	at org.apache.log4j.or.DefaultRenderer.doRender(DefaultRenderer.java:37)
	at org.apache.log4j.or.RendererMap.findAndRender(RendererMap.java:80)
	at org.apache.log4j.spi.LoggingEvent.getRenderedMessage(LoggingEvent.java:368)
	at org.apache.log4j.helpers.PatternParser$BasicPatternConverter.convert(PatternParser.java:402)
	at org.apache.log4j.helpers.PatternConverter.format(PatternConverter.java:65)
	at org.apache.log4j.PatternLayout.format(PatternLayout.java:506)
	at org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:310)
	at org.apache.log4j.WriterAppender.append(WriterAppender.java:162)
	at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:251)
	at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:66)
	at org.apache.log4j.Category.callAppenders(Category.java:206)
	at org.apache.log4j.Category.forcedLog(Category.java:391)
	at org.apache.log4j.Category.info(Category.java:666)
	at actions.mobile.BranchById.execute(BranchById.java:21)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452)
	at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254)
	at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
	at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:270)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
	at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:498)
	at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
	at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129)
	at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	at java.lang.Thread.run(Thread.java:662)
571237 [http-8080-2] ERROR org.hibernate.LazyInitializationException  - could not initialize proxy - the owning Session was closed
org.hibernate.LazyInitializationException: could not initialize proxy - the owning Session was closed
571308 [http-8080-2] ERROR org.hibernate.LazyInitializationException  - 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:60)
	at org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:111)
	at org.hibernate.proxy.pojo.cglib.CGLIBLazyInitializer.invoke(CGLIBLazyInitializer.java:140)
	at org.softwarelabs.hangout.model.Branch$$EnhancerByCGLIB$$50aea7bd.getAddress(<generated>)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:210)
	at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:160)
	at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:126)
	at org.apache.struts2.json.JSONWriter.add(JSONWriter.java:352)
	at org.apache.struts2.json.JSONWriter.bean(JSONWriter.java:215)
	at org.apache.struts2.json.JSONWriter.process(JSONWriter.java:160)
	at org.apache.struts2.json.JSONWriter.value(JSONWriter.java:126)
	at org.apache.struts2.json.JSONWriter.write(JSONWriter.java:94)
	at org.apache.struts2.json.JSONUtil.serialize(JSONUtil.java:115)
	at org.apache.struts2.json.JSONResult.createJSONString(JSONResult.java:200)
	at org.apache.struts2.json.JSONResult.execute(JSONResult.java:172)
	at com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:373)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:277)
	at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
	at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:270)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
	at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
	at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
	at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:498)
	at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
	at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at com.opensymphony.sitemesh.webapp.SiteMeshFilter.obtainContent(SiteMeshFilter.java:129)
	at com.opensymphony.sitemesh.webapp.SiteMeshFilter.doFilter(SiteMeshFilter.java:77)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	at java.lang.Thread.run(Thread.java:662)

[ntumba lobo]

I think the problem comes from the AbstractDAO.
1) All the declared methods close the hibernate session in the finally section. There is no chance that any lazy initialization will take place after the DAO completes.
2) The DAO seems to be using a Hibernate session different to the session created by the OpenSessionInViewFilter.
To use the session from the OpenSessionInViewFilter you need to get the session with the method getCurrentSession() but I have seen in your DAO code "HibernateUtil.openSession()"
Again with that no chance lazy init will take place.

I hope that helps

[Oron Subayi]

ntumba lobo wrote:I think the problem comes from the AbstractDAO.
1) All the declared methods close the hibernate session in the finally section. There is no chance that any lazy initialization will take place after the DAO completes.
2) The DAO seems to be using a Hibernate session different to the session created by the OpenSessionInViewFilter.
To use the session from the OpenSessionInViewFilter you need to get the session with the method getCurrentSession() but I have seen in your DAO code "HibernateUtil.openSession()"
Again with that no chance lazy init will take place.

I hope that helps

Hi
Since nobody answer, I figured it out by myself : )
Thanks anyway!

[ntumba lobo]

Have you tried making changes based on my previous comment first ?
Something else went wrong ?