What is Lazy Loading In AM

Hi
My understanding is on lazy Loading is
At the design Time , The BC4J are associated with RootAM are Instantiated On demand.
Isn't it?

Close you old thread also...Dont leave them open until or unless the issue is not resolved.
DescritiveFlexField Requirement
The Lazy Loading option defers instantion of view instances and nested application modules until they are needed. This is more performant than choosing to instantiate all referenced objects at AM instantiation time regardless of whether or not they are needed.
Read more in dev guide
Thanks
--Anil
http://oracleanil.blogspot.com/

Similar Messages

Problem with module lazy loading in flex 3

Hi every body!
I have some problems with Module lazy loading. I am using flex 3.5, Module-flex3-0.14, parsley 3.2.
I can't get the LazyModuleLoadPolicy working correctly.
In my main application (the one that loads the modules), my parsley context is the following:
        <cairngorm:LazyModuleLoadPolicy objectId="lazyLoadPolicy" type="{ OpenViewMessage }" />
     <cairngorm:ModuleMessageInterceptor type="{ OpenViewMessage }"/>
     <cairngorm:ParsleyModuleDescriptor objectId="test"
          url="TestModule.swf"
          applicationDomain="{ClassInfo.currentDomain}"
     />
And to load my module:
[Inject(id="test")]
[Bindable] public var test:IModuleManager;
<core:LazyModulePod
     id="moduleLoader"
     moduleManager="{test}"
     moduleId="testModule"
/>
with LazyModulePod.mxml:
<mx:Canvas
    xmlns:mx="http://www.adobe.com/2006/mxml"
    xmlns:module="com.adobe.cairngorm.module.*"
    xmlns:parsley="http://www.spicefactory.org/parsley">
    <mx:Script>
        <![CDATA[
            import com.adobe.cairngorm.module.ILoadPolicy;
            import com.adobe.cairngorm.module.IModuleManager;
            [Bindable]
            public var moduleId:String;
            [Bindable]
            public var moduleManager:IModuleManager;
            [Bindable]
            [Inject(id="lazyLoadPolicy")]
            public var lazyLoadPolicy:ILoadPolicy;
        ]]>
    </mx:Script>
    <parsley:Configure/>
    <module:ViewLoader id="moduleLoader"
        moduleId="{ moduleId }"
        moduleManager="{ moduleManager }"
        loadPolicy="{lazyLoadPolicy}">
         
    </module:ViewLoader>
</mx:Canvas>
OpenViewMessage.as in a swc:
public class OpenViewMessage
        private var _moduleId:String;
        private var _viewId:String;
        public function OpenViewMessage(moduleId:String, viewId:String)
            this._moduleId = moduleId;
            this._viewId = viewId;
        public function get viewId():String{
            return _viewId;
        [ModuleId]
        public function get moduleId():String
            return _moduleId;
In another flex project, my module context is:
<mx:Object
     xmlns:mx="http://www.adobe.com/2006/mxml"
     xmlns:controler="com.cegedim.myit.controler.*">
     <controler:WindowControler/>
</mx:Object>
The module implements IParsleyModule
<mx:Module xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical"
     implements="com.adobe.cairngorm.module.IParsleyModule"
     xmlns:spicefactory="http://www.spicefactory.org/parsley">
     <mx:Script>
          <![CDATA[
               import org.spicefactory.parsley.flex.FlexContextBuilder;
               import com.adobe.cairngorm.module.IParsleyModule;
               public function get contextBuilder():ContextBuilderTag
                return contextBuilderTag;
          ]]>
     </mx:Script>
     <spicefactory:ContextBuilder id="contextBuilderTag" config="{ MyITTestModuleContext }"/>
     <spicefactory:Configure/>
</mx:Module>
and the WindowControler:
public class WindowControler
     public function WindowControler(){}
     [Init]
        public function initialize():void
            Alert.show("Module Initialized");
        [MessageHandler(scope="local")]
        public function openViewMessageHandler(message:OpenViewMessage):void
            Alert.show("Opening view " + message.viewId + " in the module " + message.moduleId);
If i uncomment the basicLoadPolicy in LazyModulePod.mxml and remove the lazyModuleLoadPolicy, everything works fine. The module is loaded when it's added to stage and it receives correctly messages dispatched to it. But with the lazy policy the module never loads.
I may have missed something or there is somthing i don't understand because i tried the ModuleTest provided in example in cairngorm sources. It works fine (i mean loading the moduleA2 when receiving a message), but if i replace the change the lazyModulePolicy to listen to broadcasted messages instead of a pingMessage, the module never loads too.
    <cairngorm:LazyModuleLoadPolicy objectId="lazyLoadPolicy" type="{ BroadcastMessage }" />
    <cairngorm:ModuleMessageInterceptor
        type="{ BroadcastMessage }" moduleRef="moduleA" />
public class BroadcastMessage
    public function BroadcastMessage()
If someone has any clue, i'll be happy to test it =)
Thanks.

Hello, back on my issue, i tested a little bit more the message dispaching.
I read the lazyLoadPolicy class and noticed that it always has to have a ModuleId property in the message to work, that's why the broadcast message didn't work to awake the module with the lazy loading policy.
So i added copy of my module:
     <cairngorm:ParsleyModuleDescriptor objectId="test"
          url="TestModule.swf"
          applicationDomain="{ClassInfo.currentDomain}"
     />
     <cairngorm:ParsleyModuleDescriptor objectId="testbis"
          url="TestModuleBis.swf"
          applicationDomain="{ClassInfo.currentDomain}"
     />
Set them both with a basicLoadPolicy, and tries to dispatch a message to only one of them using the ModuleId metatag. I then noticed that both modules received the message and not only the one i expected.
I then changed the ModuleMessageInterceptor configuration to dispatch to only one kind of module:
<cairngorm:ModuleMessageInterceptor type="{ OpenViewMessage }" moduleRef="test"/>
and this worked as expected. Only the first module catched the message. I am obiously messing with the ModuleId metatag but i cannot see what's wrong...
I compiled with
-keep-as3-metadata+=ModuleId
but this hasn't changed anything...

Java and lazy loading

Hello all!
I have three question regarding lazy loading:
Question one: Can it be said that java works by lazy loading by default?
Question two: What is the opposite of lazy loading?
Question three: How can I change this default behavior to the opposite of lazy loading?
Thanks in advance,
Julien.

1. Yes.
2. Eager loading.
3. You can't. You can get a half-decent approximation using a suitable classloader, though. After defining your class, you parse the string table and load the classes referred to therein. BCEL may useful for the parsing.

Equals and lazy loading

Hi all,
We have an application in which we use lazy loading on our client, so we can't be sure that both objects have the same objects reference loaded already. While implementing the equals method I came to the problem if it makes sense to compare the lazy loaded objects as well, because this might lead to a very deep object comparison through the whole object tree which might be very unperformant if I load this references on demand. Otherwise not comparing the references might be an incomplete comparision of these objects and makes the usage of the equals method very difficult.
Has anyone experience using the equals method with lazy loading?
Thanks in advance
Marco

Okay - here comes a little more detail about our architecture to give you a deeper understanding. Currently we are working with EJB3 / JBoss environment but our intention is to encapsulate this through a DAO-layer. Anyways we have special object-dependencies as per example a customer has it�s orders. So in my understanding a customer with the an address, a name etc. with NO orders is not the same as a customer with the same address and the same name and let�s say 2 orders. So I can stick with comparing simply the name and the address, but this wouldn�t give you an exact comparison.
The other way would be to compare the orders as well, but what if the orders have a number of invoices behind them. The conclusion would be, that I�d have to compare them as well. Additionally I have the problem, that I have totally equal customers with the same number of orders and invoices, but the first one has a null-value in its orders, because they have not been loaded from database yet and the other one has. So my technique with comparing the lazy-loaded references would not work here. A complete loading of all references for a comparison cannot be the solution here either.
So it is hard to say if they are I/O intensive. Worst case would be, that we have to load the complete object-tree for comparison from database and send them between client and server (jboss). This is part of our question? Should this be the consequence of lazy loading or is it best pratice to stick with the local attributes and let the client do the work, so that he has to work through the whole object-tree if he wants to know the exact equality.
Does this give you a more detailled view of our question? I guess I am not the first to deal with this problem, so I�d like to share your experiences with you about what is "wise" to do.
Thanks for your help
Marco

Lazy loading, EntityManager and concurrency.

I need advice which strategy to use with lazy loading.
My project is based on Spring, Struts 2 and Hibernate JPA. I have enough OneToMany and ManyToMany relationships and it's reasonable to use lazy loading. It seems very convenient to load data in Struts Actions with OpenEntityManagerInViewFilter in such way like:
Style style = user.getStyle()
But to avoid LazyLoadException I have to use:
@PersistenceContext(type=PersistenceContextType.EXTENDED)
Unfortunately, EntityManager in this case becomes not thread-safe, according to Spring docs: "+Extended EntityManagers are not thread-safe, hence they must not be used in concurrently accessed beans (which Spring-managed singletons usually are).+" EXTENDED means that EntityManager is shared in user session and my EntityManager is injected in singleton services.
I've found this issue when tried to make quick sequential page reloading which call some selects and got:
java.sql.SQLException: You can't operate on a closed Statement!!!
What's the best practice in this situation:
1. Try synchronize session access to EntityManager by myself or put each user database requests in separate queue (something terrible I suppose).
2. Use HQL queries with join fetch to preload data for access outside of transaction (maybe overhead).
3. Or something else???
And why we need EXTENDED context if it's so unreliable??
Thanks for help!

Hi
Do you have the link to the "lazy loading content"?
I can't find a proper way to do it.
Thanks

Lazy Load in a View?

All,
I recentely completed initial development for a fairly complex, custom reporting component. As one might expect, it heavily uses SQL queries and a graph of objects in memory to render the various reports and search functionality available. The graph of objects can contain parent-child relationships up to five nesting levels deep. Not all reports and screens use all five nesting levels. In order to increase efficiency and lower the memory footprint, I implemented Lazy Load on these parent-child relationships.
My issue might just be a philosophical one. However, what I have ended up with is that a given JSP will initiate a Lazy Load as needed. For most model calculations and API usage, the Lazy Load simply is not required. So, the JSP ends up making these calls.
It seems a bit strange to have a JSP invoking operations that require database calls after the model has been returned to a view for dispatch.
Am I worrying overmuch about something not all that important? Or would you recommend moving this type of Lazy Load logic into the controller (we are using Struts) before dispatching the model to a given JSP?
- Saish

Not sure I completely understand what your solution was but I once designed a model that would do incremental 'lazy' loads.
The basic idea was to resolve an issue with downloading large amounts of data from before displaying anything. The model Objects were heirarchical (think tree) so we made it so that a the data was retrieved in parts and reassembled on the client. The top level items were retrieved first. So we would go ahead a display the top level Object while we were retrieving it's substructure in a background thread. As the user started digging down, a parent would block if it's child was not yet available.
The desired effect was that the users would not be aware of any delays. the server would tend to fill in the heirarchy faster than the user could expand it. Really fast users might catch up with it but would still benefit from at some level.
I left the company before I saw it go implemented but a competent developer did work on it (I don't know how much was revised) and my old boss told me that he asked that the design not be changed much and that the final result flew.
However this was for a 'fat' client. I'm not sure if this applies to your JSP situation. The basic point is that you can lazy load in the model and the gui doesn't have to know anything about it.

Enable lazy-loading for web dynpro ?

Hi,
i have an oss message opened, where i got the following message:
If you wish to change the start-up mode or enable lazy-loading,
these can be configured.
Please go to Windows->Preferences->Web Dynpro
and you can set the lazy loading or other start-up modes here
which will be then configured by default in your application-j2ee-engine.xml.
Please see attached snapshot.
Best Regards,
Vidya
what does he mean by 'windows->preferences->Web Dynpro' ??? WHERE do i have
to do this !
best regards, Martin

Hi Martin,
You have to change these setting in SAP Netweaver Developer Studio, when you open SAP Netweaver Developer Studio, you will have a Windows tab on the Top level Navigation, open that and Choose Preferences, and finally Choose "WebDynpro"..and make the changes..
Hope this helps,
Regards,
Shailesh Nagar
Edited by: Shailesh Kumar Nagar on Feb 25, 2008 10:30 AM

Toplink.weaving=true gives PersistenceException; for Lazy Loading config.

I could use some help configuring my persistence.xml file, trying to make sure Lazy loading is configured properly. What I see in the logs normally is that Toplink defaults to Eager fetching on my JPA objects. So according to
http://www.oracle.com/technology/products/ias/toplink/JPA/essentials/toplink-jpa-extensions.html
I need to set toplink.weaving=true in persistence.xml, however I get the Exception below when I make the call to get the EntityManager for the first time.
I'm using OC4J standalone 10.1.3.3 with JDK 1.5.0_13 and the latest Toplink (as you can see in the stack trace below). An excerpt from my persistence.xml is below that.
Caused by: Exception [TOPLINK-30005] (Oracle TopLink Essentials - 2.0 (Build b58g-fcs (09/07/2007))): oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: xyx-dal-webservice.root:0.0.0
Internal Exception: javax.persistence.PersistenceException: Exception [TOPLINK-28020] (Oracle TopLink Essentials - 2.0 (Build b58g-fcs (09/07/2007))): oracle.toplink.essentials.exc
eptions.EntityManagerSetupException
Exception Description: Value [true] for the property [toplink.weaving] is incorrect when global instrumentation is null, value should either be null or false. at oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException.exceptionSearchingForPersistenceResources(PersistenceUnitLoadingException.java:143)
at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.createEntityManagerFactory(EntityManagerFactoryProvider.java:169)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:59)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:48)
at gov.dhs.visit.ident.dal.jpa.entity.cvt.util.EntityManagerHelper.<clinit>(EntityManagerHelper.java:20)
... 43 more
Caused by: javax.persistence.PersistenceException: Exception [TOPLINK-28020] (Oracle TopLink Essentials - 2.0 (Build b58g-fcs (09/07/2007))): oracle.toplink.essentials.exceptions.E
ntityManagerSetupException
Exception Description: Value [true] for the property [toplink.weaving] is incorrect when global instrumentation is null, value should either be null or false.
at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer.callPredeploy(JavaSECMPInitializer.java:151)
at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer.initPersistenceUnits(JavaSECMPInitializer.java:239)
at oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer.initialize(JavaSECMPInitializer.java:255)
at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.createEntityManagerFactory(EntityManagerFactoryProvider.java:155)
... 46 more
Caused by: Exception [TOPLINK-28020] (Oracle TopLink Essentials - 2.0 (Build b58g-fcs (09/07/2007))): oracle.toplink.essentials.exceptions.EntityManagerSetupException
Exception Description: Value [true] for the property [toplink.weaving] is incorrect when global instrumentation is null, value should either be null or false.
at oracle.toplink.essentials.exceptions.EntityManagerSetupException.wrongWeavingPropertyValue(EntityManagerSetupException.java:244)
... 50 more
SEVERE: Caught exception while handling request: oracle.oc4j.rmi.OracleRemoteException: java.lang.ExceptionInInitializerError; nested exception is:
java.lang.ExceptionInInitializerError oracle.oc4j.rmi.OracleRemoteException: java.lang.ExceptionInInitializerError; nested exception is:
java.lang.ExceptionInInitializerError
persistence.xml
<persistence-unit name="PUName" transaction-type="JTA">
     <provider>oracle.toplink.essentials.PersistenceProvider</provider>
          <jta-data-source>jdbc/mydb</jta-data-source>
<class>....a whole lotta JPA classes...</class>
    <properties>
         <property name="toplink.logging.level" value="FINE" />
         <property name="toplink.logging.timestamp" value="true"/>
           <property name="toplink.target-database" value="Oracle"/>
           <property name="toplink.target-server" value="OC4J_10_1_3" />
           <property name="toplink.weaving" value="true"/>
                <property name="toplink.cache.shared.default" value="false"/>
    </properties>
</persistence-unit>

This error confuses me...
Exception [TOPLINK-30005] (Oracle TopLink Essentials - 2.0 (Build b58g-fcs (09/07/2007))): oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: sun.misc.Launcher$AppClassLoader@11b86e7
Internal Exception: javax.persistence.PersistenceException: Exception [TOPLINK-28020] (Oracle TopLink Essentials - 2.0 (Build b58g-fcs (09/07/2007))): oracle.toplink.essentials.exceptions.EntityManagerSetupException
Exception Description: Value [true] for the property [toplink.weaving] is incorrect when global instrumentation is null, value should either be null or false.
     at oracle.toplink.essentials.exceptions.PersistenceUnitLoadingException.exceptionSearchingForPersistenceResources(PersistenceUnitLoadingException.java:143)
     at oracle.toplink.essentials.ejb.cmp3.EntityManagerFactoryProvider.createEntityManagerFactory(EntityManagerFactoryProvider.java:169)
     at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:110)I'm using TopLink from regular ol' Java SE (not container managed environment).
http://www.oracle.com/technology/products/ias/toplink/JPA/essentials/toplink-jpa-extensions.html gives some hints, though, especially if you're operating outside of a container (seems like you gotta weave yourself). See http://www.oracle.com/technology/products/ias/toplink/JPA/essentials/toplink-jpa-extensions.html#LazyLoading
Seems the command-line arg "-javaagent:toplink-essentials-agent.jar" is critical if you're running outside a container.

About lazy loading

Is there any material about lazy-loading in kodo. If one class contains a
collection type field, how does kodo deal with this field when query the
object ?
Thanks
Liang Zhilong
EMail : [email protected]
Tel : (021)54235858-6650
Fax : (021)54235800
PhotonicBridges Co., Ltd.
12F, 900 Yi Shan Rd., Shanghai 200233

Thanks for your kind help, my Chinese friend.
"Sun Bin" <[email protected]> ??????:[email protected]...
I'm also a JDO user. Glad to see your Chinese name!
I think you should not close the pm before any pending use of PC objects.
You may use a ThreadLocal object to get the pm in different methods
without passing the pm as an argument.
see:
http://www.jdocentral.com/forums/index.php?act=ST&f=11&t=625&s=94c11c31c3acd
a1bf154a6d50fde9b36
>
My answers to your former questions:
Lazy loading is configurable according to JDO spec, to the field-level,
and this is called Default-Fetch-Group. By default, all Collections are
lazy-loaded.
As for the "makeTransientAll" behavior, there's some discussion on
JDOCentral.com/forums/
I remember someone pointed out a solution for your need. While, you can
still use a ThreadLocal object to solve this problem.
Liang Zhilong wrote:
I write a class
public class NciEms
protected String emsVersion = null;
protected String type = null;
protected List subnetworkList = new ArrayList();
protected List managedElementList = new ArrayList();
protected List topoLinkList = new ArrayList();
protected List trafficDescriptorList = new ArrayList();
And an application:
// Obtain pm
pm = xx.getPersistenceManager();
// Query out the jdo object
ems = (NciEms)getJdoObject( pm, NciEms.class,
"name=="/EMS=PhotonicBridges@/SNM"" );
// Print the object
Whether "com.solarmetric.kodo.DefaultFetchThreshold" is set to "30" or
"-1"(Disable lazy loading), the output is always:
1.1) name =/EMS=PhotonicBridges@/SNM
1.2) native ems name=PhotonicVision SNM
1.3) owner =None
1.4) user label =PhotonicVision SNM
1.5) ems version = 1.2.0
1.6) type = MSTP
1.7) me list (length:0) = null
1.8) TL list (length:0) = null
1.9) Subnetwork list (length:0) = null
1.10) TD list (length:0) = null
Why ?
If I close the pm after query the object out, and pass this object to
another method, I cannot use this object in that method because pm has
been
closed. I try to makeTransient the object before it is passed, it doeswork.
But when I use the list field in this object(this list field has been
retrieved out in pm), the "PersistenceManager has been closed" exception
turns up again. Need I makeTransientAll every list fields ? It's awful.
If this usage is required, what the best way?
"Liang Zhilong" <[email protected]> __'____________________
:[email protected]...
Furthermore, what granularity is configurable for lazy loading,
global,
class-level or field-level ?
"Liang Zhilong" <[email protected]> __'____________________
:[email protected]...
Is there any material about lazy-loading in kodo. If one class
contains
a
collection type field, how does kodo deal with this field when query
the
object ?
Thanks
Liang Zhilong
EMail : [email protected]
Tel : (021)54235858-6650
Fax : (021)54235800
PhotonicBridges Co., Ltd.
12F, 900 Yi Shan Rd., Shanghai 200233

Disable Lazy Loading for Navigation Properties on Entities in EF 5

Hello all,
Can we disable Lazy Loading for Navigation properties on any entity?
If yes, how we can achieve the same.
Thanks,
Naresh

Hi Naresh;
If you are using code first you can do the following to turn off Lazy loading for a given navigation property. For example
lets say we have a Customers table and a Orders table and a Customer can have 1 to many Orders the following POCO class has a ICollection that is mark as virtual, This causes Lazy loading to happen when a property of order is accessed.
// Lazy Loading Enabled
public class Customers
public int Id { get; set; }
public string Name { get; set; }
public virtual ICollection<Order> Orders { get; set; }
To turn off Lazy loading remove the virtual key word as follows:
// Lazy Loading Is Disabled
public class Customers
public int Id { get; set; }
public string Name { get; set; }
public ICollection<Order> Orders { get; set; }
To turn of Lazy Loading for all entities using Code First you can do the following in the constructor of the DbContext.
public class MyContext : DbContext
public MyContext()
this.Configuration.LazyLoadingEnabled = false;
If the above does not meet your needs please tell us what version of the Entity Framework, which context type you are using, for example ObjectContext or DbContext, and which modeling you are using such as Code First, Model First or Database First.
Fernando (MCSD)
If a post answers your question, please click "Mark As Answer" on that post and "Mark as Helpful".

Configuring Lazy Loading on Finder Methods with Annotations

Hi!
I would like to ask you if it is possible to "Configuring Lazy Loading on Finder Methods with Annotations" in Toplink Essentials, using annotations instead of deployment descriptor.
Thank you,
Florin

I am not sure what you are asking. Lazy loading is configured on the mapping, not the queries.
There are examples on how to configure lazy loading on mappings at www.otn.oracle.com/jpa. If this is not what youare trying to do, please give me a use case that you are trying to support. thanks
Peter

Dissapeared footer (where is written what page is loading and so on) how to restore it?

Dissapeared footer (where is written what page is loading and so on) how to restore it?
there is the screenshot ( http://j.imagehost.org/0213/Clipboard03.jpg )

View > Statusbar = click it

In Safari I can define what pages are loaded when I open a "New Window". How do I achieve the same in Firefox (and supress the current begavior of it opening all of the tabs that I defined as my home page all the time)?

I am returning to Firefox after having used Safari on Mac for the past year. One thing I liked about Safari was that I could define what page gets loaded when I used the File Menu command to open a new Browser Window. I defined this as opening up with my Bookmarks Menu where I then was able to select the page I wanted to go to.
I have not been able to find a way to define this in Firefox and was surprised to see that "New Window" in Firefox opens all of tabs that I've defined as my Home Page.
Is there a way to manage this?

This issue can be caused by an extension that isn't working properly.
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do not click the Reset button on the Safe mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

It doesn�t work lazy loading with remote client (toplink)

I am trying to use lazy loading in a @ManyToOne field but I get an exception. I have been reading in some oracle tutorials that it's necesary use -javaagent:.../lib/toplink-essentials-agent.jar for that it works because this argument activate dynamic weaving in JavaSE. I have put this command line argument javaagent but it doesn't work. Why? Can I have to do another thing? I have done a lot of tests in base to comments read in another forums but I only obtains an exception.
Caused by: java.io.IOException: Mismatched serialization UIDs
NOTE: The server use toplink and the remote client query the entitties through a session bean of the server. Besides, I am using Glassfish (Sun application server and toplink).
Thanks in advance.
hayken

At first, thank you for your reply.
I know that I haven´t explained the problem too well. I have a stateless bean with one remote method that execute a query an returns an entity like this
@Entity
public class ModuloEntity extends Serializable
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long idModulo;
private String nombre;
@ManyToOne(fetch=FetchType.LAZY)
@JoinColumn(name="IdProyecto")
private ProyectoEntity proyecto;
The remote client invoke this method and in that moment I get this exception.
21-may-2007 18:55:48 com.sun.corba.ee.impl.encoding.CDRInputStream_1_0 read_value
ADVERTENCIA: "IOP00810211: (MARSHAL) Exception from readValue on ValueHandler in CDRInputStream"
org.omg.CORBA.MARSHAL: vmcid: SUN minor code: 211 completed: Maybe
at com.sun.corba.ee.impl.logging.ORBUtilSystemException.valuehandlerReadException(ORBUtilSystemException.java:7053)
Caused by: java.io.IOException: Mismatched serialization UIDs : Source (Rep. IDRMI:com.syskonic.gesplan.entities.ModuloEntity:6D06A8C14D488FFF:8E6FC8687EA9E512) = 8E6FC8687EA9E512 whereas Target (Rep. ID RMI:com.syskonic.gesplan.entities.ModuloEntity:1C6925798CDFD3DF:3455DBF4457AE337) = 3455DBF4457AE337
at com.sun.corba.ee.impl.util.RepositoryId.useFullValueDescription(RepositoryId.java:573)
If I look the server log, I can see that the call has not been produced, it doesn´t show any exception. It looks that the object managed by the server and the remote client aren´t the same and the corba service doesn´t work when remote client call session method. If I change the ModuloEntity and remove the fetch attribute then all this process executes correctly. The problem is in this attribute.
NOTE: I am using the javaagent command line argument.
Hayken

Facing problem with lazy loading in ejb3.0

The following error is coming up when i try to access the collection in the entity entity bean. i am using entitymanager.find() to retrieve the entity. intial set of values are coming fine but when try to access the collection in the entity the error is coming up. one solution is to make the fetch type=eager. but can we do lazy loading with out any problem. the following is the error. kindly help me in this. do i need to do anything extra that mean have to add any annotations or anything.
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.lucid.erp.entities.EmployeeDTO.addresses, no session or session was closed
     at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationException(AbstractPersistentCollection.java:358)
     at org.hibernate.collection.AbstractPersistentCollection.throwLazyInitializationExceptionIfNotConnected(AbstractPersistentCollection.java:350)
     at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:343)
     at org.hibernate.collection.AbstractPersistentCollection.read(AbstractPersistentCollection.java:86)
     at org.hibernate.collection.PersistentBag.get(PersistentBag.java:422)
     at com.lucidlabs.erp.actions.EmployeeAction.view(EmployeeAction.java:20)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:404)
     at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:267)
     at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:229)
     at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:221)
     at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
     at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
     at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
     at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
     at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
     at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:150)
     at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:48)
     at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
     at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
     at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
     at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
     at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
     at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:123)
     at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
     at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
     at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
     at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
     at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:184)
     at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
     at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
     at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
     at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
     at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
     at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:105)
     at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
     at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
     at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
     at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
     at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:83)
     at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
     at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
     at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
     at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
     at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:207)
     at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
     at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
     at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
     at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
     at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:74)
     at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:224)
     at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:223)
     at com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
     at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:221)
     at

this is transactions 101 material. Do you know about transactions and how they work? Do you know about managed entities?
The problem you are having is that the addresses are accessed outside of the transaction in which the entity was fetched. That means there is no more database session and thus the lazy fetch cannot work. If you really need the addresses, you can at least force fetch them by calling getAddresses().size() right after you fetch the entity from the database; assuming that the transaction is still active at that point.

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