EJB Home Objects and Stubs

Hi,
Can anyone pls tell me,what are the objects are created in Server after the Deployment of EJB.
Is the EJB Home Object,EJB Home Object Stub,EJB Home Object Skeleton, EJB Local Home Object, EJB LocalHome Object Stub,Ejb LocalHome Object Skeleton.And Finally both the Stub objects and Skeleton Objects will be stored in the Jndi Registry ?
Thanks in Advance,
Venkat

Nic,
Caching the home object is a comon practice.
Take a look here:
http://www.theserverside.com/resources/patterns_review.jsp
Look at the EJB Home Factory Pattern.
Regards,
-Dat

Similar Messages

Can l make an instance of EJB home handler / Datasource shared by EJB objs

all ejb guru
As far as l know, it is general rule of thumb to cache the EJB home handlers and datasource object at EJB bean instance. But can l go a step further, make the same instance of EJB home handlers and datasource object shared by more than 1 EJB bean instance ?
( l checked out the methods of javax.ejb.EJBhome and javax.sql.DataSource. They are not declared as synchronized. It seems to me that EJB home handlers and datasource object are not thread safe and not suitable for being shared. Even they are thread-safe, if they are shared by 1+ EJB bean instance. Sharing EJB home handlers and datasource object may interfere the thread management of EJB container. Am l correct ? )
It is highly appreciated someone can share with me your insight in this issue.
thanks & regards
Danny

Okay, you got me there. However, it's usually a better practice to start a new thread with your specific question instead of resurrecting old threads that (obviously) nobody cared enough to answer.
DataSources are retrieved from the container via JNDI. You may (generally) cache them in order to alleviate the JNDI lookup without worrying about Threads, as there is only (usually) one DataSource object per server (or node in a cluster). Do not cache (in your code) the Connection objects obtained from the DataSource - always close them in order to return them to the pool maintained by the DataSource.
Caching EJB HomeHandles is the accepted manner of avoiding repeated JNDI calls to locate EJBs. Typically, extracting the EJBHome from the HomeHandle re-initializes whatever network operations are embedded in the EJBHome object(s) by the vendor's implementation. Once again, you do not necessarily need to worry about Threads - the container and vendor implementation is already taking care of that for you, transparently.
Think about it: if there were Threading issues, even retrieving the above objects via JNDI would ensure that J2EE application servers wouldn't be Thread safe and all operations would be, essentially, blocked each time. Obviously, this is not the case since both DataSources and EJBHome objects can have multiple clients using them simultaneously. Just because there's not explicit synchronized tag on any of the methods defined in these interfaces doesn't mean they're single-Thread objects.

EJB home stubs in a cluster

The following URL describes how replica-aware EJB home stubs work. Basically,
when you do a lookup for the EJB home in JNDI, you get a home stub on any of the
nodes in the cluster.
However, I want to invoke EJBs on a particular node in the cluster. Can I do
this by simply disabling the replica-aware EJB home in the deployment descriptor
and doing a remote JNDI lookup on the desired node in the cluster? And if so,
would I have to bind each EJB's home to JNDI with a different name?
-reza
http://edocs.bea.com/wls/docs61/cluster/object.html#1006777
All bean homes can be clustered. When a bean is deployed on a server, its home
is bound into the cluster-wide naming service.
Because homes can be clustered, each server can bind an instance of the home under
the same name. When a client looks up this home, it gets a replica-aware stub
that has a reference to the home on each server that deployed the bean. When create()
or find() is called, the replica-aware stub routes the call to one of the replicas.
The home replica receives the find() results or creates an instance of the bean
on this server.

However, I want to invoke EJBs on a particular node in the cluster. Can Ido
this by simply disabling the replica-aware EJB home in the deploymentdescriptor
and doing a remote JNDI lookup on the desired node in the cluster? Andif so,
would I have to bind each EJB's home to JNDI with a different name?Yes. Something like that. We do that with JMS queues sometimes (to send a
message to a particular machine in the cluster).
Peace,
Cameron Purdy
Tangosol, Inc.
Clustering Weblogic? You're either using Coherence, or you should be!
Download a Tangosol Coherence eval today at http://www.tangosol.com/
"Behforooz" <[email protected]> wrote in message
news:3c8fc8bf$[email protected]..
>

Exception when invoking create method on entity ejb's home object

I have a simple entity bean. I am able to get the reference to the entity's home object. But when I run create method on entity's home interface, I get the following exception. The create method takes no arguments as the primary key is Auto-Increment field in MYSQL database. Here is the exception. I am using jdeveloper and embedded OC4J as server.
07/06/22 15:51:15 java.lang.NullPointerException
07/06/22 15:51:15 at EmployeeHome_EntityHomeWrapper2.create(EmployeeHome_EntityHomeWrapper2.java:1168)
07/06/22 15:51:15 at com.pd.EmpAddInput.addEmployee(EmpAddInput.java:64)
07/06/22 15:51:15 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
07/06/22 15:51:15 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
07/06/22 15:51:15 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
07/06/22 15:51:15 at java.lang.reflect.Method.invoke(Method.java:585)
07/06/22 15:51:15 at com.sun.faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:146)
07/06/22 15:51:15 at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:92)
07/06/22 15:51:15 at javax.faces.component.UICommand.broadcast(UICommand.java:332)
07/06/22 15:51:15 at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:287)
07/06/22 15:51:15 at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:401)
07/06/22 15:51:15 at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:95)
07/06/22 15:51:15 at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:268)
07/06/22 15:51:15 at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:110)
07/06/22 15:51:15 at javax.faces.webapp.FacesServlet.service(FacesServlet.java:213)
07/06/22 15:51:15 at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:712)
07/06/22 15:51:15 at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:369)
07/06/22 15:51:15 at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:865)
07/06/22 15:51:15 at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:447)
07/06/22 15:51:15 at com.evermind.server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:215)
07/06/22 15:51:15 at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:117)
07/06/22 15:51:15 at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:110)
07/06/22 15:51:15 at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
07/06/22 15:51:15 at oracle.oc4j.network.ServerSocketAcceptHandler.procClientSocket(ServerSocketAcceptHandler.java:239)
07/06/22 15:51:15 at oracle.oc4j.network.ServerSocketAcceptHandler.access$700(ServerSocketAcceptHandler.java:34)
07/06/22 15:51:15 at oracle.oc4j.network.ServerSocketAcceptHandler$AcceptHandlerHorse.run(ServerSocketAcceptHandler.java:880)
07/06/22 15:51:15 at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
07/06/22 15:51:15 at java.lang.Thread.run(Thread.java:595)
What may be causing this exception.

I have solved the problem. It had to do with the autocommit=true feature of the MYSQL connection. However I have ran into another trouble. I am getting the following exception.
java.lang.IllegalStateException: Can not call getPrimaryKey() inside ejbCreate(...) methods, the entity does not have an identity yet, see the EJB 2.0 specification chapter 10.5.4
     at com.evermind.server.ejb.EJBUtils.throwGetPrimaryKeyInEJBCreateException(EJBUtils.java:892)
     at EmployeeRemote_EntityBeanWrapper0.getPrimaryKey(EmployeeRemote_EntityBeanWrapper0.java:1686)
     at EmployeeHome_EntityHomeWrapper2.create(EmployeeHome_EntityHomeWrapper2.java:1055)
     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:585)
     at com.evermind.server.rmi.RmiMethodCall.run(RmiMethodCall.java:53)
     at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
     at java.lang.Thread.run(Thread.java:595)
java.lang.IllegalStateException: Can not call getPrimaryKey() inside ejbCreate(...) methods, the entity does not have an identity yet, see the EJB 2.0 specification chapter 10.5.4
     at com.evermind.server.rmi.RMICall.EXCEPTION_ORIGINATES_FROM_THE_REMOTE_SERVER(RMICall.java:109)
     at com.evermind.server.rmi.RMICall.throwRecordedException(RMICall.java:125)
     at com.evermind.server.rmi.RMIClientConnection.obtainRemoteMethodResponse(RMIClientConnection.java:517)
     at com.evermind.server.rmi.RMIClientConnection.invokeMethod(RMIClientConnection.java:461)
     at com.evermind.server.rmi.RemoteInvocationHandler.invoke(RemoteInvocationHandler.java:63)
     at com.evermind.server.rmi.RecoverableRemoteInvocationHandler.invoke(RecoverableRemoteInvocationHandler.java:28)
     at __Proxy0.create(Unknown Source)
     at com.pd.model.EmployeeRemoteClient.main(EmployeeRemoteClient.java:37)
I am not calling getPrimaryKey() in ejbCreate() then why this exception

ClassCastException - While type casting Home object after EJB JNDI Lookup

Sun One Application Server throws a ClassCastException when I try to type cast Home object to it's respective interface type.
Here is the code ---
==============================================
Object obj = PortableRemoteObject.narrow( context.lookup( jndiName ), homeClass);
System.out.println("Remote Object - obj : "+obj);
if (obj != null) {
   System.out.println("obj.getClass().getName() : "+obj.getClass().getName());
   System.out.println("obj.getClass().getSuperclass() : "+obj.getClass().getSuperclass());
   Class[] interfaces = obj.getClass().getInterfaces();
   if (interfaces != null) {
      for (int count = 0; count < interfaces.length; count++) {
         System.out.println("interfaces[ " + count + " ].getName() : " + interfaces[ count ].getName());
}==============================================
The class name is dislpayed as the Stub class name.
While displaying the interfaces, the Home Interface name is displayed.
But later when I try to type cast it into Home Interface type, it throws a ClassCastException.
Can somebody please check this?

Please post the stack trace. Also, take a look at our EJB FAQ to make sure you're doing the
recommended lookup :
https://glassfish.dev.java.net/javaee5/ejb/EJB_FAQ.html

ABAP Objects and EJB

Hi every one,
Can <b>ABAP Objects and EJB</b> be compared?
-Naveen.

Hi Naveen,
Check this guide- might be useful-
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/dc09af90-0201-0010-d09b-bd611a11070b
Regards,
Moorthy

Problem with Dynamically accessing EJB Class objects in WL 7.0 SP1

I am trying to build a component which has the ability to instantiate and execute
an known EJB method on the fly.
I have managed to build the component but when I try and execute it I get a ClassNotFoundException.
I know that the EJB I am trying to invoke is deployed and available on the server,
as I can see it in the console, I also seen to have been able to get the remote
interface of the object, my problem occurs when I try and access the class object
so I can perform a create on the object and then execute my method
The code I have written is below:
private Object getRemoteObject(Context pCtx, String pJNDIName, String pHomeBean)
throws Exception {
     String homeCreate = "create";
     Class []homeCreateParam = { };
     Object []homeCreateParamValues = {};
try {
//This call seems to work and doesn't throw an exception
Object home = pCtx.lookup(pJNDIName);
//However this call throws a java.lang.ClassNotFoundException
Class homeBean = Class.forName(pHomeBean);
Method homeCreateMethod = homeBean.getMethod(homeCreate,homeCreateParam);
return homeCreateMethod.invoke(home, homeCreateParamValues);
} catch (NamingException ne) {
logStandardErrorMessage("The client was unable to lookup the EJBHome.
Please make sure ");
logStandardErrorMessage("that you have deployed the ejb with the JNDI
name "+pJNDIName+" on the WebLogic server ");
throw ne;
} catch (Exception e) {
logStandardErrorMessage(e.toString());
throw e;
Any advice would be really appreciated, I'm fast running out of ideas, I suspect
it has something to do with the class loader but I'm not sure how to resolve it
Regards
Jo Corless

Hello Joanne,
Congratulations! I'm very happy that you've managed to fix your problem. It's
always essential to understand how to package applications when deploying on BEA
WebLogic. Usually, by throwing everything into an EAR file solves just about all
the class loader problems. :-) Let us know if you have any further problems that
we can assist you with.
Best regards,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
"Joanne Corless" <[email protected]> wrote:
>
>
I've fixed it!!!!!!!!
Thanks to everyone who gave me help!!!!
The class loader was the culprit which is what I suspected all along.
As soon
as I put the 2 jar files I was using into an EAR file the problem went
away!!!!!
Thanks again
Jo Corless
"Ryan LeCompte" <[email protected]> wrote:
Hello Joanne,
As Mr. Woollen mentioned, I also believe it's a problem with the class
loader.
You need to be careful how you arrange your EJBs, because WebLogic has
a specific
method in which it loads classes in an EAR, JAR, and WAR file(s). Please
refer
to http://dev2dev.bea.com/articles/musser.jsp for more information about
BEA WebLogic
class loading mechanisms and caveats. Also, try printing out the various
methods
that are available on the object that was returned to you via reflection.
For
example, use the getMethods() method, which returns an array of Method
objects
that you can subsequently cycle through and print out the various method
names.
This way you can discover if the class found/returned to you is indeed
the one
you intend to locate.
Hope this helps,
Ryan LeCompte
[email protected]
http://www.louisiana.edu/~rml7669
Rob Woollen <[email protected]> wrote:
I believe the issue is the home interface class for this EJB is not
available in the class loader which is doing the reflection.
If you do:
getClass().getClassLoader().loadClass(homeInterfaceClassName)
I suspect it will fail. Reflection still requires that the class be
loadable.
-- Rob
Joanne Corless wrote:
Hi Slava,
If I make my code look like you describe below I get a compliationerror telling
me that
home.getMethod() is not recognised (no such method)
If I change it slightly and use
Method homeCreateMethod =
home.getClass().getMethod(homeCreate,homeCreateParam);
The code will compile OK but when executed it still throws a NoSuchMethodException
Any ideas ?
Thanks for your help so far
Regards
Jo Corless
Your code should look like
Object home = pCtx.lookup(pJNDIName);
Method homeCreateMethod =
home.getMethod(homeCreate,homeCreateParam);
return homeCreateMethod.invoke(home, homeCreateParamValues);
Regards,
Slava Imeshev
"Joanne Corless" <[email protected]> wrote in message
news:[email protected]...
Hi Ryan,
I also wanted to mention that if you do a "header search" in this
particular
newsgroup
with the search query as "reflection", you will see many previousmessages
regarding
reflection and EJBs. I believe you could learn a lot from thedifficulties
that
others have faced and solved.I tried that and although there was a number of similar cases noneof them
actually
seem to fix my issue. Thanks for the suggestion though
Are the EJBs that you are trying to access accessible via your
system
classpath?
Try to avoid having them accessible via the main system classpath,and
only bundle
them in your appropriate EJB jar files (contained in an EAR file,for
example).Maybe I should have laid the problem out a little clearer.
I have a number of EJB's bundled up in a JAR file which is hot deployedto
the
server. Within this first JAR file is an EJB (SSB) component that
needs
to
be
able to invoke a known method on another EJB. This second EJB may
or
may
not be
within the first JAR file but it also will be hot deployed.
The component trying to invoke the method on the 2nd EJB has to
be
able to
create
an instance of the 2nd EJB without actually knowing anything bar
a
JNDI
Name which
is passed in at runtime.
I can get as far as doing the
Object home = pCtx.lookup(pJNDIName);
This returned a class with the name
"com.csc.edc.projects.allders.httppostoffice.postman.PostmanBean_mp8qy2_Home
Impl_WLStub"
My problem seems to occur when I try and invoke the create method
Method homeCreate = home.getClass().getMethod("create", new Class[0]);
My code throws a java.lang.NoSuchMethodException at this point so
I
am
unable
to progress to the next step of :
Object bean = homeCreate.invoke(home, null);
So I can return the instantiated bean back to the calling client.
Why am I getting the NoSuchMethodException, is is because I am gettinga
stub
back rather than the home interface and if so how do I get the truehome
interface
from the bean
Thanks in advance
Jo Corless

Undable to bind EJB Home during deploy

Hi
I'm getting an exception when I redeploy to weblogic81. I have and ear with several ejb jars in it. The following is the message I get...
Unable to bind EJB Home Interface to the JNDI name: EJBTestService. javax.naming.NameAlreadyBoundException: EJBTestService is already bound; remaining name :at weblogic.jndi.internal.BasicNamingNode.bindHere(BasicNamingNode.java:333) at weblogic.jndi.internal.ServerNamingNode.bindHere(ServerNamingNode.java:124) at weblogic.jndi.internal.BasicNamingNode.bind(BasicNamingNode.java:291) at weblogic.jndi.internal.WLEventContextImpl.bind(WLEventContextImpl.java:279) at weblogic.jndi.internal.WLContextImpl.bind(WLContextImpl.java:384) at weblogic.ejb20.deployer.ClientDrivenBeanInfoImpl.activate(ClientDrivenBeanInfoImpl.java:1116) at weblogic.ejb20.deployer.EJBDeployer.activate(EJBDeployer.java:1362) at weblogic.ejb20.deployer.EJBModule.activate(EJBModule.java:631)
This error doesn't always occur with the same jar in the ear. Sometimes the above jar prepares and activates fine and another one fails.
If anyone has any idea I'd appreciate feedback.

Hello,
The error suggests that an object is already bound to the JNDI name.
This can happen if you have 2 or more ejbs in your EAR file wit the same JNDI name or if your application has not fully/cleanly undeployed before you try to redeploy it.
I suspect the latter is your problem. Once you have undeployed your application use the weblogic console to view your JNDI tree and make sure nothing is bound that should not be bound. Then redeploy your app. If you still have the problem check your ear does not have duplicate ejbs or ejbs using the same JNDI name.

Home object one for each client

1.
When client looks up for home (context.lookup("TraderHome")) :-
1.Client gets the Home Stub which was implemented by the Server, is it correct ?
2.On the server who will communicate with this client homestub? One home-object for on server ? Is it correct ?
3. So Client home-stub and server-home object one-to-one communication ?
4. Will the home-stub object carries any context from server ?(like security or user-specific context ?
5. Can we restrict so that certain user can only get the home object ?
please make me clear ...
-thanks
Praveen Sadhu.

When client looks up for home (context.lookup("TraderHome")) :-
1.Client gets the Home Stub which was implemented by the Server, is it correct ?
2.On the server who will communicate with this client homestub? One home-object for on server ? Is it correct ?
3. So Client home-stub and server-home object one-to-one communication ?
4. Will the home-stub object carries any context from server ?(like security or user-specific context ?
5. Can we restrict so that certain user can only get the home object ?
please make me clear ...
-thanks
Praveen Sadhu.

How to use JNDI to lookup remote EJB Home?

Hello,
I am writing a servlet to call a remote EJB on another machine.
I use JNDI to lookup remote EJBHome (not) but fail.
Any advice?
Any trick to configure application-client.xml?
Thanks!

Use com.evermind.server.rmi.RMIInitialContextFactory instead
Here an example
// EmployeeClient.java
package mypackage5;
import javax.ejb.*;
import javax.naming.*;
import javax.rmi.PortableRemoteObject;
import java.io.*;
import java.util.*;
import java.rmi.RemoteException;
import com.evermind.server.ApplicationClientInitialContextFactory;
import com.evermind.server.rmi.RMIInitialContextFactory;
* A simple client for accessing an EJB.
public class EmployeeClient
public static void main(String[] args)
System.out.println("EmployeeClient.main(): client started...");
try
* initialize JNDI context by setting factory, url and credential
* in a hashtable
Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.evermind.server.rmi.RMIInitialContextFactory");
//env.put(Context.INITIAL_CONTEXT_FACTORY, "com.evermind.server.ApplicationClientInitialContextFactory");
env.put(Context.PROVIDER_URL, "ormi://koushikm:23791/application4");
env.put(Context.SECURITY_PRINCIPAL, "admin");
env.put(Context.SECURITY_CREDENTIALS, "admin");
* or set these properties in jndi.properties
* or use container defaults if that's where client got launched from
Context context = new InitialContext(env);
* Lookup the EmployeeHome object. The reference is retrieved from the
* application-local context (java:comp/env). The variable is
* specified in the assembly descriptor (META-INF/application-client.xml).
Object homeObject =
context.lookup("HelloEJB");
System.out.println("EmployeeClient.main(): bean found...");
// Narrow the reference to EmployeeHome.
HelloEJBHome home =
(HelloEJBHome) PortableRemoteObject.narrow(homeObject,
HelloEJBHome.class);
System.out.println("EmployeeClient.main(): home narrowed...");
// Create remote object and narrow the reference to Employee.
HelloEJB remote =
(HelloEJB) PortableRemoteObject.narrow(home.create(), HelloEJB.class);
System.out.println("EmployeeClient.main(): remote created...");
String message=remote.helloWorld("SUCCESS");
System.out.println(message);
} catch(NumberFormatException e) {
System.err.println("NumberFormatException: " + e.getMessage());
} catch(RemoteException e) {
System.err.println("RemoteException: " + e.getMessage());
} catch(IOException e) {
System.err.println("IOException: " + e.getMessage());
} catch(NamingException e) {
System.err.println("NamingException: " + e.getMessage());
} catch(CreateException e) {
System.err.println("CreateException: " + e.getMessage());
Hello,
I am writing a servlet to call a remote EJB on another machine.
I use JNDI to lookup remote EJBHome (not) but fail.
Any advice?
Any trick to configure application-client.xml?
Thanks!

EJB Home Factory question

I have a doubt about implementing EJB Home Factory design pattern ( a form of Service Locator pattern)
in an application running on Weblogic clustered environment. A colleague of mine told me that because this pattern is singleton based( which is true - no doubt about that), it will not be supported by the container
beacause server instances are being run on different JVMs. I think what he says is wrong but want to be sure. Please tell me if it is OK to implement this pattern in this type of environment and if yes/no, why.
Thanks
Vlad

Yes, you can implement it, but your colleague is correct: it won't work quite the way you think it will.
A "Singleton" in the WLS server (we'll get to clusters in a minute) is only unique inside it's ClassLoader (not JVM). The way WLS works is that it allocates/creates ClassLoaders for each major type of deployment: EAR, EJB, and WAR. Fortunately, they are "nested" (in the order given), so if you have a SIngleton in the EAR ClassLoader, it will be the only instance of that class for the EJBs and WARs in that EAR. SImilarly, if you've deployed only a WAR, the Singleton will only be unique for that WAR, not the entire server.
With clusters, WLS is not "aware" of the Singleton as it is not a distributed object. So the instance(s) will not propagate between the nodes. So if you've deployed an EAR with a Singleton, the number of Singletons in the system will be n, where n is the number of nodes. If you have the same Singleton class in two different EARs, then it's obvious that there will be 2*n instances of the Singleton.
Now, given the pitfalls and caveats, yes, it is an effective pattern to reduce the number of JNDI lookups and caching of the HomeHandle implementations for EJBs.

EJB 3.0 and Struts 1.0

Have a Struts/EJB question...
If I have a web-form backed by an ActionForm in Struts, where the user
types in a record that maps directly to an EJB3 entity class and a
corresponding db-table, is it advisable (or even possible) to somehow
use the same class for the ActionForm and the EJB?
Im thinking the 2 beans, they have basically the same setter/getter
methods,
but the form-bean extends ActionForm, while the Entity class
implements serializable...
Is it possible to use one and the same class for both purposes... or
maybe one extends the other...
Or should they just be two different classes, and have to copy data
back and forth between them?
What is "best practice" here?
Edited by: vb.bajpai on Feb 13, 2009 4:13 AM

Well, the "best practice" is the one that better fits for you. Your idea of making another bean for struts, has been thought before. That technique is called "DTO Pattern". Search the java blueprints for the DTO Pattern.
So you have 2 options
Use EJB entities through all your app
pros: less code to write
cons: highly coupled code. struts must stick to your EJB entity beans.
Use the DTO pattern
pros: loose coupled design. you can change your entities and your struts forms wont be affected.
cons: more code to write. You may need help from a bean to bean mapper like dozer or ezconvert
PS: DTO (Data Transfer Object), VO (Value Object), and TO (Transfer Object) are all synonyms.

ABAP Objects and BADI

HI
Can anyone give me the link for ABAP Objects and BADI'S.
I would like to have ABAP Objects with Example as well as BADIS.
Please tell me as iam new to those.
Thanks in advance

Hi,
ABAP objects have an elaborated list plz mention specific objects u want to know.
These are few of the links which I got through the sdn.sap for the objects like ALV,LSMW,IDOCS, etc..
Start with this.Refer this
For BDC:
http://myweb.dal.ca/hchinni/sap/bdc_home.htm
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/home/bdc&
http://www.sap-img.com/abap/learning-bdc-programming.htm
http://www.sapdevelopment.co.uk/bdc/bdchome.htm
http://www.sap-img.com/abap/difference-between-batch-input-and-call-transaction-in-bdc.htm
http://help.sap.com/saphelp_47x200/helpdata/en/69/c250684ba111d189750000e8322d00/frameset.htm
http://www.sapbrain.com/TUTORIALS/TECHNICAL/BDC_tutorial.html
Check these link:
http://www.sap-img.com/abap/difference-between-batch-input-and-call-transaction-in-bdc.htm
http://www.sap-img.com/abap/question-about-bdc-program.htm
http://www.itcserver.com/blog/2006/06/30/batch-input-vs-call-transaction/
http://www.planetsap.com/bdc_main_page.htm
call Transaction or session method ?
http://www.sapbrain.com/FAQs/TECHNICAL/SAP_ABAP_DATADICTIONARY_FAQ.html
http://www.****************/InterviewQ/interviewQ.htm
http://help.sap.com/saphelp_46c/helpdata/en/35/2cd77bd7705394e10000009b387c12/frameset.htm
Reports
http://www.sapgenie.com/abap/reports.htm
http://www.allsaplinks.com/material.html
http://www.sapdevelopment.co.uk/reporting/reportinghome.htm
http://www.sapfans.com/forums/viewtopic.php?t=58286
http://www.sapfans.com/forums/viewtopic.php?t=76490
http://www.sapfans.com/forums/viewtopic.php?t=20591
http://www.sapfans.com/forums/viewtopic.php?t=66305 - this one discusses which way should you use - ABAP Objects calls or simple function modules.
ALE/ IDOC
http://help.sap.com/saphelp_erp2004/helpdata/en/dc/6b835943d711d1893e0000e8323c4f/content.htm
http://www.sapgenie.com/sapgenie/docs/ale_scenario_development_procedure.doc
http://edocs.bea.com/elink/adapter/r3/userhtm/ale.htm#1008419
http://www.netweaverguru.com/EDI/HTML/IDocBook.htm
http://www.sapgenie.com/sapedi/index.htm
http://www.sappoint.com/abap/ale.pdf
http://www.sappoint.com/abap/ale2.pdf
http://www.sapgenie.com/sapedi/idoc_abap.htm
http://help.sap.com/saphelp_erp2005/helpdata/en/0b/2a60bb507d11d18ee90000e8366fc2/frameset.htm
http://help.sap.com/saphelp_erp2005/helpdata/en/78/217da751ce11d189570000e829fbbd/frameset.htm
http://www.allsaplinks.com/idoc_sample.html
http://www.sappoint.com/abap.html
http://help.sap.com/saphelp_erp2004/helpdata/en/dc/6b835943d711d1893e0000e8323c4f/content.htm
http://www.sapgenie.com/sapgenie/docs/ale_scenario_development_procedure.doc
http://edocs.bea.com/elink/adapter/r3/userhtm/ale.htm#1008419
http://www.netweaverguru.com/EDI/HTML/IDocBook.htm
http://www.sapgenie.com/sapedi/index.htm
http://www.allsaplinks.com/idoc_sample.html
Check these step-by-step links
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/uuid/ccab6730-0501-0010-ee84-de050a6cc287
https://sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/uuid/8fd773b3-0301-0010-eabe-82149bcc292e
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/uuid/3c5d9ae3-0501-0010-0090-bdfb2d458985
for Smartforms material
http://www.sap-basis-abap.com/sapsf001.htm
http://www.sap-press.com/downloads/h955_preview.pdf
http://www.ossincorp.com/Black_Box/Black_Box_2.htm
http://www.sap-img.com/smartforms/sap-smart-forms.htm
http://www.sap-img.com/smartforms/smartform-tutorial.htm
http://www.sapgenie.com/abap/smartforms.htm
How to trace smartform
http://help.sap.com/saphelp_47x200/helpdata/en/49/c3d8a4a05b11d5b6ef006094192fe3/frameset.htm
http://www.help.sap.com/bp_presmartformsv1500/DOCU/OVIEW_EN.PDF
http://www.sap-img.com/smartforms/smart-006.htm
http://www.sap-img.com/smartforms/smartforms-faq-part-two.htm
Re: Need FAQ's
check most imp link
http://www.sapbrain.com/ARTICLES/TECHNICAL/SMARTFORMS/smartforms.html
step by step good ex link is....
http://smoschid.tripod.com/How_to_do_things_in_SAP/How_To_Build_SMARTFORMS/How_To_Build_SMARTFORMS.html
SAPScripts
http://esnips.com/doc/1ff9f8e8-0a4c-42a7-8819-6e3ff9e7ab44/sapscripts.pdf
http://esnips.com/doc/1e487f0c-8009-4ae1-9f9c-c07bd953dbfa/script-command.pdf
http://esnips.com/doc/64d4eccb-e09b-48e1-9be9-e2818d73f074/faqss.pdf
http://esnips.com/doc/cb7e39b4-3161-437f-bfc6-21e6a50e1b39/sscript.pdf
http://esnips.com/doc/fced4d36-ba52-4df9-ab35-b3d194830bbf/symbols-in-scripts.pdf
http://esnips.com/doc/b57e8989-ccf0-40d0-8992-8183be831030/sapscript-how-to-calculate-totals-and-subtotals.htm
SAP SCRIPT FIELDS
http://help.sap.com/saphelp_erp2005vp/helpdata/en/d1/8033ea454211d189710000e8322d00/content.htm
scripts easy material
http://www.allsaplinks.com/sap_script_made_easy.html
Debugging Document.
http://www.cba.nau.edu/haney-j/CIS497/Assignments/Debugging.doc
http://help.sap.com/saphelp_47x200/helpdata/en/c6/617ca9e68c11d2b2ab080009b43351/content.htm
http://www.cba.nau.edu/haney-j/CIS497/Assignments/Debugging.doc
http://help.sap.com/saphelp_erp2005/helpdata/en/b3/d322540c3beb4ba53795784eebb680/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/84/1f624f4505144199e3d570cf7a9225/frameset.htm
http://help.sap.com/saphelp_bw30b/helpdata/en/c6/617ca9e68c11d2b2ab080009b43351/content.htm
http://help.sap.com/saphelp_erp2005/helpdata/en/b3/d322540c3beb4ba53795784eebb680/frameset.htm
BAPI
http://help.sap.com/saphelp_46c/helpdata/en/9b/417f07ee2211d1ad14080009b0fb56/frameset.htm
http://searchsap.techtarget.com/originalContent/0,289142,sid21_gci948835,00.html
Checkout !!
http://searchsap.techtarget.com/originalContent/0,289142,sid21_gci948835,00.html
http://techrepublic.com.com/5100-6329-1051160.html#
http://www.sap-img.com/bapi.htm
http://www.sap-img.com/abap/bapi-conventions.htm
http://www.sappoint.com/abap/bapiintro.pdf
http://www.sapgenie.com/abap/bapi/example.htm
http://help.sap.com/printdocu/core/Print46c/en/data/pdf/BCMIDAPII/CABFAAPIINTRO.pdf
http://help.sap.com/printdocu/core/Print46c/en/data/pdf/CABFABAPIREF/CABFABAPIPG.pdf
http://help.sap.com/printdocu/core/Print46c/en/data/pdf/BCFESDE8/BCFESDE8.pdf
List of all BAPIs
http://www.planetsap.com/LIST_ALL_BAPIs.htm
http://www.sappoint.com/abap/bapiintro.pdf
http://www.sappoint.com/abap/bapiprg.pdf
http://www.sappoint.com/abap/bapiactx.pdf
http://www.sappoint.com/abap/bapilst.pdf
http://www.sappoint.com/abap/bapiexer.pdf
http://service.sap.com/ale
http://service.sap.com/bapi
http://www.geocities.com/mpioud/Abap_programs.html
http://www.sapdevelopment.co.uk/reporting/reportinghome.htm
Simple ALV report
http://www.sapgenie.com/abap/controls/alvgrid.htm
http://wiki.ittoolbox.com/index.php/Code:Ultimate_ALV_table_toolbox
ALV
1. Please give me general info on ALV.
http://www.sapfans.com/forums/viewtopic.php?t=58286
http://www.sapfans.com/forums/viewtopic.php?t=76490
http://www.sapfans.com/forums/viewtopic.php?t=20591
http://www.sapfans.com/forums/viewtopic.php?t=66305 - this one discusses which way should you use - ABAP Objects calls or simple function modules.
2. How do I program double click in ALV?
http://www.sapfans.com/forums/viewtopic.php?t=11601
http://www.sapfans.com/forums/viewtopic.php?t=23010
3. How do I add subtotals (I have problem to add them)...
http://www.sapfans.com/forums/viewtopic.php?t=20386
http://www.sapfans.com/forums/viewtopic.php?t=85191
http://www.sapfans.com/forums/viewtopic.php?t=88401
http://www.sapfans.com/forums/viewtopic.php?t=17335
4. How to add list heading like top-of-page in ABAP lists?
http://www.sapfans.com/forums/viewtopic.php?t=58775
http://www.sapfans.com/forums/viewtopic.php?t=60550
http://www.sapfans.com/forums/viewtopic.php?t=16629
5. How to print page number / total number of pages X/XX in ALV?
http://www.sapfans.com/forums/viewtopic.php?t=29597 (no direct solution)
6. ALV printing problems. The favourite is: The first page shows the number of records selected but I don't need this.
http://www.sapfans.com/forums/viewtopic.php?t=64320
http://www.sapfans.com/forums/viewtopic.php?t=44477
7. How can I set the cell color in ALV?
http://www.sapfans.com/forums/viewtopic.php?t=52107
8. How do I print a logo/graphics in ALV?
http://www.sapfans.com/forums/viewtopic.php?t=81149
http://www.sapfans.com/forums/viewtopic.php?t=35498
http://www.sapfans.com/forums/viewtopic.php?t=5013
9. How do I create and use input-enabled fields in ALV?
http://www.sapfans.com/forums/viewtopic.php?t=84933
http://www.sapfans.com/forums/viewtopic.php?t=69878
10. How can I use ALV for reports that are going to be run in background?
http://www.sapfans.com/forums/viewtopic.php?t=83243
http://www.sapfans.com/forums/viewtopic.php?t=19224
11. How can I display an icon in ALV? (Common requirement is traffic light icon).
http://www.sapfans.com/forums/viewtopic.php?t=79424
http://www.sapfans.com/forums/viewtopic.php?t=24512
12. How can I display a checkbox in ALV?
http://www.sapfans.com/forums/viewtopic.php?t=88376
http://www.sapfans.com/forums/viewtopic.php?t=40968
http://www.sapfans.com/forums/viewtopic.php?t=6919
Go thru these programs they may help u to try on some hands on
ALV Demo program
BCALV_DEMO_HTML
BCALV_FULLSCREEN_DEMO ALV Demo: Fullscreen Mode
BCALV_FULLSCREEN_DEMO_CLASSIC ALV demo: Fullscreen mode
BCALV_GRID_DEMO Simple ALV Control Call Demo Program
BCALV_TREE_DEMO Demo for ALV tree control
BCALV_TREE_SIMPLE_DEMO
BC_ALV_DEMO_HTML_D0100
Remote Function Call:
RFC is an SAP interface protocol. Based on CPI-C, it considerably simplifies the programming of communication processes between systems.
RFCs enable you to call and execute predefined functions in a remote system - or even in the same system.
RFCs manage the communication process, parameter transfer and error handling.
http://help.sap.com/saphelp_47x200/helpdata/en/22/042860488911d189490000e829fbbd/frameset.htm.
ALE/ IDOC
http://help.sap.com/saphelp_erp2004/helpdata/en/dc/6b835943d711d1893e0000e8323c4f/content.htm
http://www.sapgenie.com/sapgenie/docs/ale_scenario_development_procedure.doc
http://edocs.bea.com/elink/adapter/r3/userhtm/ale.htm#1008419
http://www.netweaverguru.com/EDI/HTML/IDocBook.htm
http://www.sapgenie.com/sapedi/index.htm
http://www.sappoint.com/abap/ale.pdf
http://www.sappoint.com/abap/ale2.pdf
http://www.sapgenie.com/sapedi/idoc_abap.htm
http://help.sap.com/saphelp_erp2005/helpdata/en/0b/2a60bb507d11d18ee90000e8366fc2/frameset.htm
http://help.sap.com/saphelp_erp2005/helpdata/en/78/217da751ce11d189570000e829fbbd/frameset.htm
http://www.allsaplinks.com/idoc_sample.html
http://www.sappoint.com/abap.html
http://help.sap.com/saphelp_erp2004/helpdata/en/dc/6b835943d711d1893e0000e8323c4f/content.htm
http://www.sapgenie.com/sapgenie/docs/ale_scenario_development_procedure.doc
http://edocs.bea.com/elink/adapter/r3/userhtm/ale.htm#1008419
http://www.netweaverguru.com/EDI/HTML/IDocBook.htm
http://www.sapgenie.com/sapedi/index.htm
http://www.allsaplinks.com/idoc_sample.html
Refer this
http://www.sapbrain.com/FAQs/TECHNICAL/SAP_ABAP_DATADICTIONARY_FAQ.html
http://www.****************/InterviewQ/interviewQ.htm
http://help.sap.com/saphelp_46c/helpdata/en/35/2cd77bd7705394e10000009b387c12/frameset.htm
http://www.techinterviews.com/?p=198
http://www.techinterviews.com/?p=326
http://www.sap-img.com/abap/answers-to-some-abap-interview-questions.htm
http://www.sap-img.com/abap/more-than-100-abap-interview-faqs.htm
http://www.geekinterview.com/Interview-Questions/SAP-R-3/ABAP
http://sap.ittoolbox.com/documents/popular-q-and-a/abap-sample-interview-questions-3240
http://www.sap-img.com/abap/abap-interview-question.htm
http://www.allinterview.com/Interview-Questions/ABAP.html
links for OO ABAP.
http://www.sapgenie.com/abap/OO/
http://www.sapgenie.com/abap/OO/index.htm
http://help.sap.com/saphelp_nw04/helpdata/en/c3/225b5654f411d194a60000e8353423/content.htm
http://www.esnips.com/doc/375fff1b-5a62-444d-8ec1-55508c308b17/prefinalppt.ppt
http://www.esnips.com/doc/2c76dc57-e74a-4539-a20e-29383317e804/OO-abap.pdf
http://www.esnips.com/doc/5c65b0dd-eddf-4512-8e32-ecd26735f0f2/prefinalppt.ppt
http://www.allsaplinks.com/
http://www.sap-img.com/
http://www.sapgenie.com/
http://help.sap.com
http://www.sapgenie.com/abap/OO/
http://www.sapgenie.com.
http://www.sapgenie.com/abap/OO/index.htm
http://www.sapgenie.com/abap/controls/index.htm
http://www.esnips.com/doc/2c76dc57-e74a-4539-a20e-29383317e804/OO-abap.pdf
http://www.esnips.com/doc/0ef39d4b-586a-4637-abbb-e4f69d2d9307/SAP-CONTROLS-WORKSHOP.pdf
http://www.sapgenie.com/abap/OO/index.htm
http://help.sap.com/saphelp_erp2005/helpdata/en/ce/b518b6513611d194a50000e8353423/frameset.htm
http://www.sapgenie.com/abap/OO/
some more materials.
Go through the following Documents Links & Materials for ABAP Objects
check the below links lot of info and examples r there
http://www.sapgenie.com/abap/OO/index.htm
http://www.geocities.com/victorav15/sapr3/abap_ood.html
http://www.brabandt.de/html/abap_oo.html
Check this cool weblog:
/people/thomas.jung3/blog/2004/12/08/abap-persistent-classes-coding-without-sql
/people/thomas.jung3/blog/2004/12/08/abap-persistent-classes-coding-without-sql
/people/sap.user72/blog/2005/05/10/a-small-tip-for-the-beginners-in-oo-abap
/people/ravikumar.allampallam/blog/2005/02/11/abap-oo-in-action
/people/thomas.jung3/blog/2005/09/08/oo-abap-dynpro-programming
http://help.sap.com/saphelp_nw04/helpdata/en/c3/225b6254f411d194a60000e8353423/frameset.htm
http://www.sapgenie.com/abap/OO/
http://www.sapgenie.com/abap/OO/index.htm
http://help.sap.com/saphelp_nw04/helpdata/en/c3/225b5654f411d194a60000e8353423/content.htm
http://www.esnips.com/doc/375fff1b-5a62-444d-8ec1-55508c308b17/prefinalppt.ppt
http://www.esnips.com/doc/2c76dc57-e74a-4539-a20e-29383317e804/OO-abap.pdf
http://www.esnips.com/doc/5c65b0dd-eddf-4512-8e32-ecd26735f0f2/prefinalppt.ppt
http://www.allsaplinks.com/
http://www.sap-img.com/
http://www.sapgenie.com/
http://help.sap.com
http://www.sapgenie.com/abap/OO/
http://www.sapgenie.com/abap/OO/index.htm
http://www.sapgenie.com/abap/controls/index.htm
http://www.esnips.com/doc/2c76dc57-e74a-4539-a20e-29383317e804/OO-abap.pdf
http://www.esnips.com/doc/0ef39d4b-586a-4637-abbb-e4f69d2d9307/SAP-CONTROLS-WORKSHOP.pdf
http://www.sapgenie.com/abap/OO/index.htm
http://help.sap.com/saphelp_erp2005/helpdata/en/ce/b518b6513611d194a50000e8353423/frameset.htm
http://www.sapgenie.com/abap/OO/
these links
http://help.sap.com/saphelp_47x200/helpdata/en/ce/b518b6513611d194a50000e8353423/content.htm
For funtion module to class
http://help.sap.com/saphelp_47x200/helpdata/en/c3/225b5954f411d194a60000e8353423/content.htm
for classes
http://help.sap.com/saphelp_47x200/helpdata/en/c3/225b5c54f411d194a60000e8353423/content.htm
for methods
http://help.sap.com/saphelp_47x200/helpdata/en/08/d27c03b81011d194f60000e8353423/content.htm
for inheritance
http://help.sap.com/saphelp_47x200/helpdata/en/dd/4049c40f4611d3b9380000e8353423/content.htm
for interfaces
http://help.sap.com/saphelp_47x200/helpdata/en/c3/225b6254f411d194a60000e8353423/content.htm
For Materials:
1) http://help.sap.com/printdocu/core/Print46c/en/data/pdf/BCABA/BCABA.pdf -- Page no: 1291
2) http://esnips.com/doc/5c65b0dd-eddf-4512-8e32-ecd26735f0f2/prefinalppt.ppt
3) http://esnips.com/doc/2c76dc57-e74a-4539-a20e-29383317e804/OO-abap.pdf
4) http://esnips.com/doc/0ef39d4b-586a-4637-abbb-e4f69d2d9307/SAP-CONTROLS-WORKSHOP.pdf
5) http://esnips.com/doc/92be4457-1b6e-4061-92e5-8e4b3a6e3239/Object-Oriented-ABAP.ppt
6) http://esnips.com/doc/448e8302-68b1-4046-9fef-8fa8808caee0/abap-objects-by-helen.pdf
7) http://esnips.com/doc/39fdc647-1aed-4b40-a476-4d3042b6ec28/class_builder.ppt
8) http://www.amazon.com/gp/explorer/0201750805/2/ref=pd_lpo_ase/102-9378020-8749710?ie=UTF8
1) http://www.erpgenie.com/sap/abap/OO/index.htm
2) http://help.sap.com/saphelp_nw04/helpdata/en/ce/b518b6513611d194a50000e8353423/frameset.htm
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/profile/2007/07/09/understandingABAPObjects&
Please visit the following links:
http://service.sap.com/erp
http://solutionbrowser.erp.sap.fmpmedia.com/ (Functional prespective)
http://service.sap.com/instguides --> mySAP Business Suite Applications --> mySAP ERP --> mySAP ERP 2005 --> Upgrade
http://help.sap.com/printdocu/core/Print46c/en/data/pdf/LOVC/LOVC.pdf
For Functionality Differences pls refer to the below site -
http://solutionbrowser.erp.sap.fmpmedia.com/
FOR BADI'S:
Check this blogs 2 find a BADI:
How to find if we have a BADI in Transaction VB02
Re: BADI for screen enhancement in MM01 transaction
Re: BADI and User exits
How To Define a New BAdI Within the Enhancement Framework (Some Basics About the BAdI,BAdI Commands in ABAP,
When to Use a BAdI?)
/people/thomas.weiss/blog/2006/04/03/how-to-define-a-new-badi-within-the-enhancement-framework--part-3-of-the-series
How to implement a BAdI And How to Use a Filter
/people/thomas.weiss/blog/2006/04/18/how-to-implement-a-badi-and-how-to-use-a-filter--part-4-of-the-series-on-the-new-enhancement-framework
Introducing Business Add-Ins
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/f3202186-0601-0010-6591-b832b1a0d0de
How to implement BAdi in Enhancement Framework
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/d0456c54-0901-0010-f0b3-cd765fb99702
Business Add-Ins
http://help.sap.com/saphelp_47x200/helpdata/en/ee/a1d548892b11d295d60000e82de14a/frameset.htm
BAdI: Customer-Defined Functions in the Formula Builder
http://help.sap.com/saphelp_nw04/helpdata/en/04/f3683c05ea4464e10000000a114084/content.htm
Difference Between BADI and User Exits
http://www.sap-img.com/abap/difference-between-badi-and-user-exits.htm
To Use BADI - Business Add In you need to Understand ABAP OO Interface Concept
http://www.sap-img.com/abap/business-add-in-you-need-to-understand-abap-oo-interface-concept.htm
You can check the links for Step by Step Badi Implemntation
(very helpful self learning docs).
BADI Step by Step Implementation.
http://www.esnips.com/doc/e06e4171-29df-462f-b857-54fac19a9d8e/ppt-on-badis.ppt
http://www.esnips.com/doc/10016c34-55a7-4b13-8f5f-bf720422d265/BADIs.pdf
http://www.esnips.com/doc/43a58f51-5d92-4213-913a-de05e9faac0d/Business-Addin.doc
http://www.esnips.com/doc/1e10392e-64d8-4181-b2a5-5f04d8f87839/badi.doc
www.sapgenie.com/publications/saptips/022006%20-%20Zaidi%20BADI.pdf
http://www.sapdevelopment.co.uk/enhance/enhance_badi.htm
http://help.sap.com/saphelp_nw04/helpdata/en/04/f3683c05ea4464e10000000a114084/content.htm
http://help.sap.com/saphelp_nw04/helpdata/en/e6/d54d3c596f0b26e10000000a11402f/content.htm
http://help.sap.com/saphelp_nw2004s/helpdata/en/c2/eab541c5b63031e10000000a155106/frameset.htm
http://help.sap.com/saphelp_nw04/helpdata/en/04/f3683c05ea4464e10000000a114084/content.htm
http://help.sap.com/saphelp_nw04/helpdata/en/e6/63ee7f486cc143a560799d8803ce29/content.htm
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/srm/badi-general+information&
http://www.esnips.com/doc/e06e4171-29df-462f-b857-54fac19a9d8e/ppt-on-badis.ppt
http://www.esnips.com/doc/10016c34-55a7-4b13-8f5f-bf720422d265/BADIs.pdf
http://www.esnips.com/doc/43a58f51-5d92-4213-913a-de05e9faac0d/Business-Addin.doc
http://www.esnips.com/doc/1e10392e-64d8-4181-b2a5-5f04d8f87839/badi.doc
www.sapgenie.com/publications/saptips/022006%20-%20Zaidi%20BADI.pdf
http://www.sapdevelopment.co.uk/enhance/enhance_badi.htm
http://help.sap.com/saphelp_nw04/helpdata/en/04/f3683c05ea4464e10000000a114084/content.htm
http://help.sap.com/saphelp_nw04/helpdata/en/e6/d54d3c596f0b26e10000000a11402f/content.htm
http://help.sap.com/saphelp_nw2004s/helpdata/en/c2/eab541c5b63031e10000000a155106/frameset.htm
The specified item was not found.
http://help.sap.com/saphelp_erp2005/helpdata/en/73/7e7941601b1d09e10000000a155106/frameset.htm
http://support.sas.com/rnd/papers/sugi30/SAP.ppt
http://www.sts.tu-harburg.de/teaching/sap_r3/ABAP4/abapindx.htm
http://members.aol.com/_ht_a/skarkada/sap/
http://www.ct-software.com/reportpool_frame.htm
http://www.saphelp.com/SAP_Technical.htm
http://www.kabai.com/abaps/q.htm
http://www.guidancetech.com/people/holland/sap/abap/
http://www.planetsap.com/download_abap_programs.htm
http://help.sap.com/saphelp_nw04/helpdata/en/c8/1975cc43b111d1896f0000e8322d00/content.htm
http://www.allsaplinks.com/badi.html
/people/thomas.weiss/blog/2006/04/03/how-to-define-a-new-badi-within-the-enhancement-framework--part-3-of-the-serieshttps:///people/alwin.vandeput2/blog/2006/04/13/how-to-search-for-badis-trace-it
/people/thomas.weiss/blog/2006/04/18/how-to-implement-a-badi-and-how-to-use-a-filter--part-4-of-the-series-on-the-new-enhancement-framework /people/thomas.weiss/blog/2006/05/03/source-code-enhancements--part-5-of-the-series-on-the-new-enhancement-framework
http://www.esnips.com/doc/e06e4171-29df-462f-b857-54fac19a9d8e/ppt-on-badis.ppt
http://www.esnips.com/doc/10016c34-55a7-4b13-8f5f-bf720422d265/BADIs.pdf
http://www.esnips.com/doc/43a58f51-5d92-4213-913a-de05e9faac0d/Business-Addin.doc
http://www.esnips.com/doc/1e10392e-64d8-4181-b2a5-5f04d8f87839/badi.doc
http://www.esnips.com/doc/3b7bbc09-c095-45a0-9e89-91f2f86ee8e9/BADI-Introduction.ppt
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/40921dd7-d5cf-2910-1894-bb62316afbd1
http://help.sap.com/saphelp_erp2005/helpdata/en/73/7e7941601b1d09e10000000a155106/frameset.htm
http://support.sas.com/rnd/papers/sugi30/SAP.ppt
http://www.sts.tu-harburg.de/teaching/sap_r3/ABAP4/abapindx.htm
http://members.aol.com/_ht_a/skarkada/sap/
http://www.ct-software.com/reportpool_frame.htm
http://www.saphelp.com/SAP_Technical.htm
http://www.kabai.com/abaps/q.htm
http://www.guidancetech.com/people/holland/sap/abap/
http://www.planetsap.com/download_abap_programs.htm
http://help.sap.com/saphelp_nw04/helpdata/en/c8/1975cc43b111d1896f0000e8322d00/content.htm
/people/thomas.weiss/blog/2006/04/03/how-to-define-a-new-badi-within-the-enhancement-framework--part-3-of-the-series
/people/thomas.weiss/blog/2006/04/18/how-to-implement-a-badi-and-how-to-use-a-filter--part-4-of-the-series-on-the-new-enhancement-framework
http://esnips.com/doc/e06e4171-29df-462f-b857-54fac19a9d8e/ppt-on-badis.ppt
http://esnips.com/doc/43a58f51-5d92-4213-913a-de05e9faac0d/Business-Addin.doc
http://esnips.com/doc/10016c34-55a7-4b13-8f5f-bf720422d265/BADIs.pdf
http://esnips.com/doc/1e10392e-64d8-4181-b2a5-5f04d8f87839/badi.doc
http://esnips.com/doc/365d4c4d-9fcb-4189-85fd-866b7bf25257/customer-exits--badi.zip
http://esnips.com/doc/3b7bbc09-c095-45a0-9e89-91f2f86ee8e9/BADI-Introduction.ppt
http://help.sap.com//saphelp_470/helpdata/EN/eb/3e7cee940e11d295df0000e82de14a/frameset.htm
Difference Between BADI and User Exits
http://www.sap-img.com/abap/difference-between-badi-and-user-exits.htm
Reward Points if found helpfull..
Cheers,
Chandra Sekhar.

Dynamic Class Loading and Stubs

How Dynamic Class Loading is used on Java RMI, since stubs are generated on clients using Reflection API?
I was reading Dynamic code downloading using JavaTM RMI (http://java.sun.com/javase/6/docs/technotes/guides/rmi/codebase.html), it seems to be out of date.
For example, "The client requests the class definition from the codebase. The codebase the client uses is the URL that was annotated to the stub instance when the stub class was loaded by the registry. Back in step 1, the annotated stub for the exported object was then registered with the Java RMI registry bound to a name."

"Enhancements in J2SETM 5.0
Dynamic Generation of Stub Classes
This release adds support for the dynamic generation of stub classes at runtime, obviating the need to use the Java(tm) Remote Method Invocation (Java RMI) stub compiler, rmic, to pregenerate stub classes for remote objects. *Note that rmic must still be used to pregenerate stub classes for remote objects that need to support clients running on _earlier versions_.*
When an application exports a remote object (using the constructors or static exportObject methods(1) of the classes java.rmi.server.UnicastRemoteObject or java.rmi.activation.Activatable) and a pregenerated stub class for the remote object's class cannot be loaded, the remote object's stub will be a java.lang.reflect.Proxy instance (whose class is dynamically generated) with a java.rmi.server.RemoteObjectInvocationHandler as its invocation handler.
An existing application can be deployed to use dynamically generated stub classes unconditionally (that is, whether or not pregenerated stub classes exist) by setting the system property java.rmi.server.ignoreStubClasses to "true". If this property is set to "true", pregenerated stub classes are never used.
Notes:
* If a remote object has pre-5.0 clients, that remote object should use a stub class pregenerated with rmic or the client will get an ClassNotFoundException deserializing the remote object's stub. Pre-5.0 clients will not be able to load an instance of a dynamically generated stub class, because such a class contains an instance of RemoteObjectInvocationHandler, which was not available prior to this release.
* Prior to the J2SE 5.0 release, exporting a remote object would throw a java.rmi.StubNotFoundException if the pregenerated stub class for the remote object's class could not be loaded. With the added support for dynamically generated stub classes, exporting a remote object that has no pregenerated stub class will silently succeed instead. A user deploying a server application to support pre-5.0 clients must still make sure to pregenerate stub classes for the server's remote object classes, even though missing stub classes are no longer reported at export time. Such errors will instead be reported to a pre-5.0 client when it deserializes a dynamically generated stub class.
(1) The static method UnicastRemoteObject.exportObject(Remote) is declared to return java.rmi.server.RemoteStub and therefore cannot be used to export a remote object to use a dynamically generated stub class for its stub. An instance of a dynamically generated stub class is a java.lang.reflect.Proxy instance which is not assignable to RemoteStub."
http://java.sun.com/j2se/1.5.0/docs/guide/rmi/relnotes.html

Unable to find Local Ejb home in websphere 6.0

Its really anoying as am unable to guess . I am invoking an EJB locally using code as below . The Ejb works fine while testing with UniversalTestClient However when i try to invoke it from my Client it gives jndi error.
Am using RAD 6.0 IDE and WebSphere6.0 and Ejb 2.1
I tried calling ejb providing different jndi names as below but it doesn't work .
Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.ibm.websphere.naming.WsnInitialContextFactory");
env.put (Context.PROVIDER_URL, "corbaloc:iiop:localhost:2809/");
try{
InitialContext icontext = new InitialContext(env);
// Object result = icontext.lookup("local:ejb/DefaultSession");
// Object result = icontext.lookup("D7VRC491Node01Cell/nodes/D7VRC491Node01/servers/server1/TestEj b/ejb/com/test/ejbs/DefaultSessionLocalHome");
// Object result = icontext.lookup("local:ejb/ejb/com/test/ejbs/DefaultSessionLocalHome");
Object result = icontext.lookup("ejb/com/dhsmv/ejbs/DefaultSessionLocalHome");
DefaultSessionLocalHome localHome = (DefaultSessionLocalHome) result;
DefaultSessionLocal localSession = (DefaultSessionLocal) localHome.create();
String strTest = localSession.welcome(" Hello World ");
System.out.println(" Retrieved ejb method ..." + strTest);
I get an exception that first component of jndi name is not available. Please suggets where is the problem hiding. Is there any thing wrong with jndi name .
Thanks.

The CORBA error could suggest your bootstrap port is already being used by another process. Try changing it to something else.
Assuming your webconsole works - its something like this (although off the top of my head can't be sure...)
Select servers from the menu on the left, then select, your server.
From the newly loaded page, on the right hand side, you should see a link called "Ports". Modify your bootstrap port, usual value is 2809.
How does that work?

EJB Home Objects and Stubs

Similar Messages

Maybe you are looking for