Clarification on EJB

Hi Friends,
I am new for EJB.I want to know how to create EJB programs?.Can any one give me and explain basic login system(using EJB and how to call that through in our jsp).
Advance Thanks
Regards
K.Suresh.
Chennai.

A good place to start is the Java EE 5 tutorial. There's a chapter on getting started with EJB.
http://java.sun.com/javaee/5/docs/tutorial/doc/
--ken

Similar Messages

I need a clarification : Can I use EJBs instead of helper classes for better performance and less network traffic?

My application was designed based on MVC Architecture. But I made some changes to HMV base on my requirements. Servlet invoke helper classes, helper class uses EJBs to communicate with the database. Jsps also uses EJBs to backtrack the results.
I have two EJBs(Stateless), one Servlet, nearly 70 helperclasses, and nearly 800 jsps. Servlet acts as Controler and all database transactions done through EJBs only. Helper classes are having business logic. Based on the request relevant helper classed is invoked by the Servlet, and all database transactions are done through EJBs. Session scope is 'Page' only.
Now I am planning to use EJBs(for business logic) instead on Helper Classes. But before going to do that I need some clarification regarding Network traffic and for better usage of Container resources.
Please suggest me which method (is Helper classes or Using EJBs) is perferable
1) to get better performance and.
2) for less network traffic
3) for better container resource utilization
I thought if I use EJBs, then the network traffic will increase. Because every time it make a remote call to EJBs.
Please give detailed explanation.
thank you,
sudheer

Please suggest me which method (is Helper classes or Using EJBs) is perferable :
1) to get better performance
EJB's have quite a lot of overhead associated with them to support transactions and remoteability. A non-EJB helper class will almost always outperform an EJB. Often considerably. If you plan on making your 70 helper classes EJB's you should expect to see a dramatic decrease in maximum throughput.
2) for less network traffic
There should be no difference. Both architectures will probably make the exact same JDBC calls from the RDBMS's perspective. And since the EJB's and JSP's are co-located there won't be any other additional overhead there either. (You are co-locating your JSP's and EJB's, aren't you?)
3) for better container resource utilization
Again, the EJB version will consume a lot more container resources.

EJB Application Client clarification

Hi EJB Guru,
I would like some clarification on accessing Remote/Local Session Bean using an Application Client. In other word,
there appears to be more than one approach to the same Session bean. Let's start by declaring the Converter EJB:
package converter.ejb;
import java.math.BigDecimal;
import javax.ejb.Remote;
@Remote
public interface Converter {
    public BigDecimal dollarToYen(BigDecimal dollars);
    public BigDecimal yenToEuro(BigDecimal yen);
package converter.ejb;
import java.math.BigDecimal;
import javax.ejb.Stateless;
@Stateless
public class ConverterBean implements converter.ejb.Converter {
    private BigDecimal euroRate = new BigDecimal("0.0070");
    private BigDecimal yenRate = new BigDecimal("112.58");
    public BigDecimal dollarToYen(BigDecimal dollars) {
        BigDecimal result = dollars.multiply(yenRate);
        return result.setScale(2, BigDecimal.ROUND_UP);
    public BigDecimal yenToEuro(BigDecimal yen) {
        BigDecimal result = yen.multiply(euroRate);
        return result.setScale(2, BigDecimal.ROUND_UP);
}I have two method to accessing this bean.
( i ) Lookup JNDI using the following set of code:
package converter.client;
import converter.ejb.Converter;
import java.math.BigDecimal;
import javax.ejb.EJB;
import javax.naming.InitialContext;
import javax.naming.Context;
import javax.naming.NamingException;
public class ConverterClient {
    public static void main(String[] args) {
        try {
            InitialContext ctx = new InitialContext();
            ConverterRemote jndiconverter = (ConverterRemote) ctx.lookup("converter.ejb.ConverterRemote");
            BigDecimal param = new BigDecimal("100.00");
            BigDecimal yenAmount = jndiconverter.dollarToYen(param);
            System.out.println("$" + param + " is " + yenAmount + " Yen.");
            BigDecimal euroAmount = jndiconverter.yenToEuro(yenAmount);
            System.out.println(yenAmount + " Yen is " + euroAmount + " Euro.");
            System.exit(0);
        } catch (javax.naming.NamingException ne) {
            System.err.println("Caught an unexpected exception!");
            ex.printStackTrace();
}( ii ) Application Client lookup?
package converter.client;
import converter.ejb.Converter;
import java.math.BigDecimal;
import javax.ejb.EJB;
public class ConverterClient {
    @EJB
    private static Converter converter;
    /** Creates a new instance of Client */
    public ConverterClient(String[] args) {
    public static void main(String[] args) {
        ConverterClient client = new ConverterClient(args);
        client.doConversion();
    public void doConversion() {
        try {
            BigDecimal param = new BigDecimal("100.00");
            BigDecimal yenAmount = converter.dollarToYen(param);
            System.out.println("$" + param + " is " + yenAmount + " Yen.");
            BigDecimal euroAmount = converter.yenToEuro(yenAmount);
            System.out.println(yenAmount + " Yen is " + euroAmount + " Euro.");
            System.exit(0);
        } catch (Exception ex) {
            System.err.println("Caught an unexpected exception!");
            ex.printStackTrace();
}It is the first time I come a cross method ( ii ) and could not get it to work properly. The error message
received were:
SJSAS server side
**RemoteBusinessJndiName: converter.ejb.Converter; remoteBusIntf: converter.ejb.Converter
LDR5010: All ejb(s) of [converter] loaded successfully!
Registering ad hoc servlet: WebPathPath: context root = "/converter", path = "/converter-app-client'
Java Web Start services started for application com.sun.enterprise.appclient.jws.ApplicationContentOrigin@c91c07
registration name=converter
    [email protected]3900 registration name=converter, context
root=/converter/converter-app-client, module name=
, parent=converter
WEB0100: Loading web module [converter:converter-war.war] in virtual server [server] at [/converter]
Class [ Lconverter/ejb/Converter; ] not found. Error while loading [ class converter.client.ConverterClient ]
Error in annotation processing: java.lang.NoClassDefFoundError: Lconverter/ejb/Converter;
deployed with moduleid = converter-app-client
Converter-app-client side
Caught an unexpected exception!
java.lang.NullPointerException
        at converter.client.ConverterClient.doConversion(ConverterClient.java:59)
        at converter.client.ConverterClient.main(ConverterClient.java:53)Here is the JNDI listing in ASADMIN:
C:\>asadmin
Use "exit" to exit and "help" for online help.
asadmin> list-jndi-entries
Jndi Entries for server within root context:
converter.ejb.Converter: javax.naming.Reference
converter.ejb.Converter#converter.ejb.Converter: javax.naming.Reference
jbi: com.sun.enterprise.naming.TransientContext
jdbc: com.sun.enterprise.naming.TransientContext
UserTransaction: com.sun.enterprise.distributedtx.UserTransactionImpl
ejb: com.sun.enterprise.naming.TransientContext
converter.ejb.Converter__3_x_Internal_RemoteBusinessHome__: javax.naming.Reference
Command list-jndi-entries executed successfully.
asadmin>My questions are:
( a ) Why does the error occur?
( b ) what is the architecture difference in accessing the same bean? Does JNDI lookup allows one to access EJB from remote host as opposed the method ( ii ) which is only restricted to local access on the same JVM/Container?
( c ) What are the pros & cons between the two?
I am using Application Client to lookup these Session Beans on Netbeans 5.5, SJSAS 9.0, SDK 1.5.0_11 on Windows XP platform.
Any guideance/advice would be very much appreciated.
Thanks alot,
Henry

Hi, may be you can help me with a similar problem that I have, I transcript the post in the netbeans forum, I really hope that you or someone can help me with this. Thanks in advance!
I hope that somebody can help me solving this issue.
Environment:
NetBeans 6.0 beta1 + glassfish b58g fresh installed
Windows XP
Make a new enterprise application with application client. Run the empty Main and it runs ok.
Now create a Stateless Session Bean with hello method.
In the Application Client Main insert a reference to the EJB using the wizard. (@EJB etc...)
invoke the hello method from the main().
right click on libraries from application client and add the application-ejb project
Deploy and it deploys ok, but when you run it throws an exception:
client:
java.lang.NullPointerException
server:
Error in annotation processing: java.lang.NoClassDefFoundError: Lorg/arautos/revista/sacrae/server/business/SACRAEFacadeRemote;
java.io.FileNotFoundException: C:\opt\glassfish-v2-b58g\domains\domain1\applications\j2ee-modules\SACRAE-app-client\SACRAE-ejb.jar (El sistema no puede hallar el archivo especificado)
Remember we added the project to the appclient libraries. If I place the missing file in the applications directory of glassfish it wont work, because when you run it, deploying on the server will erase it again. But, if you copy the jar file in the directory and open it with 7zip or any other application that can keep the file open, when you run it again it will work (because the server is not able to delete the file).
Although this is a workaround, there should be something I am doing wrong to cause this behavior, now when I try to use Java Web Start to execute the client it fails (surprisingly) with this exception:
java.lang.reflect.InvocationTargetException
Caused by: java.lang.NoClassDefFoundError: org/arautos/revista/sacrae/server/business/SACRAEFacadeRemote
at org.arautos.revista.sacrae.client.desktop.Main.main(Main.java:30)
... 21 more
And I don't know where in the domain1 directory place the jar, worse, I don't know how to solve the issue with the ejb-jar in the first place, does anybody has an idea, link, same problem? I have googled, netbeans-ed and java.net-ed a lot but didn't find anything :(
Thanks in advance for any help.
Best Regards.

EJB 2.0 Spec Clarification

I quote directly from the EJB2.0 Specification:
" Clients are not allowed to make concurrent calls to a stateful session object. If a client-invoked business
method is in progress on an instance when another client-invoked call, from the same or different client,
arrives at the same instance of a stateful session bean class, the container may throw the
java.rmi.RemoteException to the second client [4] , if the client is a remote client, or the
javax.ejb.EJBException, if the client is a local client. This restriction does not apply to a state-less
session bean because the container routes each request to a different instance of the session bean
class. "
Now the part that im confused is this:
'If a client-invoked business
method is in progress on an instance when another client-invoked call, from the same or different client'
As far as I understand,Stateful Sessions are Client-specific,that is One instance services atmost one client.So that part about "same or different client" confused me.What does it mean? Can anyone help?
Thanks in Advance.
Ameya

You can look at that part of the spec as applying to the app server vendors. A little re-wording:
"If a client-invoked business method is in progress on an instance when another client-invoked call, from the same or different client", your app server must throw a java.rmi.RemoteException or javax.ejb.EJBException, depending upon whether the request is remote or local.

RE: [iPlanet-JATO] EJB in iMT

Matt,
Thanks for your clarifications.That helps a lot.
We have found in a lot of cases, that your new components can be
implemented as JATO ModelsI don't understand this.Is it that EJB acts as the Data Model or something
Thanks,
Gajendran.
"Matthew Stevens"
Subject: RE: [iPlanet-JATO]
EJB in iMT
10/30/01 07:34 PM
Please respond to
iPlanet-JATO
Gajendran,
The iMT for NetDynamics does not current have any translation requirement
for EJBs. If you have a ND 3.x or ND 4.x application then you have no
pre-existing EJBs. ND 5.0 provided an EJB 1.0 container for Session Beans
but the Migration leaves the EJBs untouched. The migration path for ND 5.0
EJBs to J2EE EJBs is clear - it simply requires a recompiling and packaging
and tweaking. I have done this at some customer sites and it is very
straight forward. In many cases, you may find that your choice of an EJB
implementation does not truely take advantage of the features of the EJB
container and you EJBs are simply business objects (stateless and
stateful).
We have found that migrating stateless and stateful ND 5.0 EJBs to JATO
Models is very simple and greatly improves the performance in many cases.
Now that your ND application is migated to J2EE/JATO you can easily add
EJBs
to the application; JATO does not prevent this in any way. Some customers
are even adapting existing or 3rd party EJBs to JATO Models interfaces, but
this is not necessary. Your EJBs will be packaged separately in JAR file
and combined with JATO Application WAR file in an EAR file. We recommend
using a good tool like Forte to generate your EJBs. I personally suggest
that you carefully plan and analyze your requirements before moving forward
with the EJBs. Please make sure that you your new components 'need' the
features of the EJB container/framework. If you need an Entity bean then
use it. We have found in a lot of cases, that your new components can be
implemented as JATO Models. It all depends on the dynamics of the
application and constitution of your data.
matt
-----Original Message-----
From: gajendran.gopinathan@i...
[mailto:<a href="/group/SunONE-JATO/post?protectID=123166177056078154218098066036192063041102166009043241114211116056004136218164200193244096076095219">gajendran.gopinathan@i...</a>]
Sent: Tuesday, October 30, 2001 6:40 AM
Subject: [iPlanet-JATO] EJB in iMT
We have migrated an application in ND3.0 to J2EE using iMT 1.1.1.
Is there any provision in iMT which could generate EJBs?
What is the recommended approach towards this?
Thanks,
Gajendran
For more information about JATO, please visit:
http://developer.iplanet.com/tech/appserver/framework/index.jsp
For more information about JATO, please visit:
http://developer.iplanet.com/tech/appserver/framework/index.jsp
------------------------Disclaimer------------------------
The views of the author may not necessarily reflect those
of the Company. All liability is excluded to the extent
permitted by law for any claims arising as a result of the
use of this medium to transmit information by or to
IT Solutions (India) Pvt. Ltd.
We have taken precautions to minimize the risk of
transmitting software viruses, but we advise you to
carry out your own virus checks on any attachment to
this message. We cannot accept liability for any loss or
damage caused by software viruses.
------------------------Disclaimer------------------------

Matt,
Thanks for your clarifications.That helps a lot.
We have found in a lot of cases, that your new components can be
implemented as JATO ModelsI don't understand this.Is it that EJB acts as the Data Model or something
Thanks,
Gajendran.
"Matthew Stevens"
Subject: RE: [iPlanet-JATO]
EJB in iMT
10/30/01 07:34 PM
Please respond to
iPlanet-JATO
Gajendran,
The iMT for NetDynamics does not current have any translation requirement
for EJBs. If you have a ND 3.x or ND 4.x application then you have no
pre-existing EJBs. ND 5.0 provided an EJB 1.0 container for Session Beans
but the Migration leaves the EJBs untouched. The migration path for ND 5.0
EJBs to J2EE EJBs is clear - it simply requires a recompiling and packaging
and tweaking. I have done this at some customer sites and it is very
straight forward. In many cases, you may find that your choice of an EJB
implementation does not truely take advantage of the features of the EJB
container and you EJBs are simply business objects (stateless and
stateful).
We have found that migrating stateless and stateful ND 5.0 EJBs to JATO
Models is very simple and greatly improves the performance in many cases.
Now that your ND application is migated to J2EE/JATO you can easily add
EJBs
to the application; JATO does not prevent this in any way. Some customers
are even adapting existing or 3rd party EJBs to JATO Models interfaces, but
this is not necessary. Your EJBs will be packaged separately in JAR file
and combined with JATO Application WAR file in an EAR file. We recommend
using a good tool like Forte to generate your EJBs. I personally suggest
that you carefully plan and analyze your requirements before moving forward
with the EJBs. Please make sure that you your new components 'need' the
features of the EJB container/framework. If you need an Entity bean then
use it. We have found in a lot of cases, that your new components can be
implemented as JATO Models. It all depends on the dynamics of the
application and constitution of your data.
matt
-----Original Message-----
From: gajendran.gopinathan@i...
[mailto:<a href="/group/SunONE-JATO/post?protectID=123166177056078154218098066036192063041102166009043241114211116056004136218164200193244096076095219">gajendran.gopinathan@i...</a>]
Sent: Tuesday, October 30, 2001 6:40 AM
Subject: [iPlanet-JATO] EJB in iMT
We have migrated an application in ND3.0 to J2EE using iMT 1.1.1.
Is there any provision in iMT which could generate EJBs?
What is the recommended approach towards this?
Thanks,
Gajendran
For more information about JATO, please visit:
http://developer.iplanet.com/tech/appserver/framework/index.jsp
For more information about JATO, please visit:
http://developer.iplanet.com/tech/appserver/framework/index.jsp
------------------------Disclaimer------------------------
The views of the author may not necessarily reflect those
of the Company. All liability is excluded to the extent
permitted by law for any claims arising as a result of the
use of this medium to transmit information by or to
IT Solutions (India) Pvt. Ltd.
We have taken precautions to minimize the risk of
transmitting software viruses, but we advise you to
carry out your own virus checks on any attachment to
this message. We cannot accept liability for any loss or
damage caused by software viruses.
------------------------Disclaimer------------------------

Oracle Application Server 10.1.3 EJB Deployment Error

Hi ,
I am keep getting following error when try to deploy my ear files in 10.1.3. standalone env.
my ejb-jar.xml looks is
<?xml version = '1.0' encoding = 'windows-1252'?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN" "http://java.sun.com/dtd/ejb-jar_2_0.dtd">
<ejb-jar>
<enterprise-beans>
<session>
<description>Session Facade Bean ( Stateless )</description>
<display-name>FacadeBean</display-name>
<ejb-name>FacadeBean</ejb-name>
<home>com.sjrwmd.dmsap.ejb.FacadeBeanHome</home>
<remote>com.sjrwmd.dmsap.ejb.FacadeBeanRemote</remote>
<ejb-class>com.sjrwmd.dmsap.ejb.FacadeBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Bean</transaction-type>
</session>
</enterprise-beans>
<assembly-descriptor>
<container-transaction>
<method>
<ejb-name>FacadeBean</ejb-name>
<method-name>*</method-name>
</method>
<trans-attribute>Required</trans-attribute>
</container-transaction>
</assembly-descriptor>
</ejb-jar>
Your help appriciated
Thank You
Jigar
2006-02-08 17:13:40.670 NOTIFICATION JMS Router is initiating ...
2006-02-08 17:13:55.702 NOTIFICATION Application Deployer for dmsap STARTS.
2006-02-08 17:13:55.733 NOTIFICATION Copy the archive to C:\JDev1013\j2ee\home\applications\dmsap.ear
2006-02-08 17:13:55.733 NOTIFICATION Initialize ./applications\dmsap.ear begins...
2006-02-08 17:13:55.733 NOTIFICATION Removing everything under: C:\JDev1013\j2ee\home\.\applications\dmsap
2006-02-08 17:13:55.733 NOTIFICATION Auto-unpacking C:\JDev1013\j2ee\home\.\applications\dmsap.ear...
2006-02-08 17:13:55.733 NOTIFICATION Unpacking dmsap.ear
2006-02-08 17:13:55.733 NOTIFICATION Unjar C:\JDev1013\j2ee\home\.\applications\dmsap.ear in C:\JDev1013\j2ee\home\.\applications\dmsap
2006-02-08 17:13:55.998 NOTIFICATION Done unpacking dmsap.ear
2006-02-08 17:13:55.998 NOTIFICATION Finished auto-unpacking C:\JDev1013\j2ee\home\.\applications\dmsap.ear
2006-02-08 17:13:56.045 NOTIFICATION Auto-unpacking C:\JDev1013\j2ee\home\applications\dmsap\dmsap-web.war...
2006-02-08 17:13:56.045 NOTIFICATION Unpacking dmsap-web.war
2006-02-08 17:13:56.045 NOTIFICATION Unjar C:\JDev1013\j2ee\home\applications\dmsap\dmsap-web.war in C:\JDev1013\j2ee\home\applications\dmsap\dmsap-web
2006-02-08 17:13:56.498 NOTIFICATION Done unpacking dmsap-web.war
2006-02-08 17:13:56.498 NOTIFICATION Finished auto-unpacking C:\JDev1013\j2ee\home\applications\dmsap\dmsap-web.war
2006-02-08 17:13:56.498 NOTIFICATION Auto-unpacking C:\JDev1013\j2ee\home\applications\dmsap\uploaddirapp.jar...
2006-02-08 17:13:56.498 NOTIFICATION Unpacking uploaddirapp.jar
2006-02-08 17:13:56.498 NOTIFICATION Unjar C:\JDev1013\j2ee\home\applications\dmsap\uploaddirapp.jar in C:\JDev1013\j2ee\home\applications\dmsap\uploaddirapp
2006-02-08 17:13:56.748 NOTIFICATION Done unpacking uploaddirapp.jar
2006-02-08 17:13:56.748 NOTIFICATION Finished auto-unpacking C:\JDev1013\j2ee\home\applications\dmsap\uploaddirapp.jar
2006-02-08 17:13:56.748 NOTIFICATION Auto-unpacking C:\JDev1013\j2ee\home\applications\dmsap\downloadfileapp.jar...
2006-02-08 17:13:56.764 NOTIFICATION Unpacking downloadfileapp.jar
2006-02-08 17:13:56.764 NOTIFICATION Unjar C:\JDev1013\j2ee\home\applications\dmsap\downloadfileapp.jar in C:\JDev1013\j2ee\home\applications\dmsap\downloadfileapp
2006-02-08 17:13:56.967 NOTIFICATION Done unpacking downloadfileapp.jar
2006-02-08 17:13:56.967 NOTIFICATION Finished auto-unpacking C:\JDev1013\j2ee\home\applications\dmsap\downloadfileapp.jar
2006-02-08 17:13:56.983 NOTIFICATION Initialize ./applications\dmsap.ear ends...
2006-02-08 17:13:56.983 NOTIFICATION Starting application : dmsap
2006-02-08 17:13:56.983 NOTIFICATION Initializing ClassLoader(s)
2006-02-08 17:13:56.983 NOTIFICATION Initializing EJB container
2006-02-08 17:13:56.983 NOTIFICATION Loading connector(s)
2006-02-08 17:13:57.295 NOTIFICATION Starting up resource adapters
2006-02-08 17:13:57.295 NOTIFICATION Processing EJB module: dmsap-ejb.jar
2006-02-08 17:13:57.405 ERROR J2EE EJB3027 [dmsap] An error occured deploying EJB module: com.evermind.server.ejb.deployment.InvalidEJBAssemblyException: [dmsap:dmsap-ejb:FacadeBean] - Unable to load ejb-class com.sjrwmd.dmsap.ejb.FacadeBean, see section 23.2 of the EJB 2.1 specificationoracle.classloader.util.AnnotatedClassFormatError: com.sjrwmd.dmsap.ejb.FacadeBean
 Invalid class: com.sjrwmd.dmsap.ejb.FacadeBean
 Loader: dmsap.root:0.0.0
 Code-Source: /C:/JDev1013/j2ee/home/applications/dmsap/dmsap-ejb.jar
 Configuration: <ejb> in C:\JDev1013\j2ee\home\applications\dmsap
 Dependent class: com.evermind.server.ejb.deployment.BeanDescriptor
 Loader: oc4j:10.1.3
 Code-Source: /C:/JDev1013/j2ee/home/lib/oc4j-internal.jar
 Configuration: <code-source> in META-INF/boot.xml in C:\JDev1013\j2ee\home\oc4j.jar
2006-02-08 17:13:57.405 NOTIFICATION application : dmsap is in failed state
Feb 8, 2006 5:13:57 PM com.evermind.server.Application setConfig
WARNING: Application: dmsap is in failed state as initialization failedjava.lang.InstantiationException: Error initializing ejb-modules: [dmsap:dmsap-ejb:FacadeBean] - Unable to load ejb-class com.sjrwmd.dmsap.ejb.FacadeBean, see section 23.2 of the EJB 2.1 specificationoracle.classloader.util.AnnotatedClassFormatError: com.sjrwmd.dmsap.ejb.FacadeBean
 Invalid class: com.sjrwmd.dmsap.ejb.FacadeBean
 Loader: dmsap.root:0.0.0
 Code-Source: /C:/JDev1013/j2ee/home/applications/dmsap/dmsap-ejb.jar
 Configuration: <ejb> in C:\JDev1013\j2ee\home\applications\dmsap
 Dependent class: com.evermind.server.ejb.deployment.BeanDescriptor
 Loader: oc4j:10.1.3
 Code-Source: /C:/JDev1013/j2ee/home/lib/oc4j-internal.jar
 Configuration: <code-source> in META-INF/boot.xml in C:\JDev1013\j2ee\home\oc4j.jar
06/02/08 17:13:57 oracle.oc4j.admin.internal.DeployerException: java.lang.InstantiationException: Error initializing ejb-modules: [dmsap:dmsap-ejb:FacadeBean] - Unable to load ejb-class com.sjrwmd.dmsap.ejb.FacadeBean, see section 23.2 of the EJB 2.1 specificationoracle.classloader.util.AnnotatedClassFormatError: com.sjrwmd.dmsap.ejb.FacadeBean
 Invalid class: com.sjrwmd.dmsap.ejb.FacadeBean
 Loader: dmsap.root:0.0.0
 Code-Source: /C:/JDev1013/j2ee/home/applications/dmsap/dmsap-ejb.jar
 Configuration: <ejb> in C:\JDev1013\j2ee\home\applications\dmsap
 Dependent class: com.evermind.server.ejb.deployment.BeanDescriptor
 Loader: oc4j:10.1.3
 Code-Source: /C:/JDev1013/j2ee/home/lib/oc4j-internal.jar
 Configuration: <code-source> in META-INF/boot.xml in C:\JDev1013\j2ee\home\oc4j.jar
06/02/08 17:13:57 at oracle.oc4j.admin.internal.ApplicationDeployer.addApplication(ApplicationDeployer.java:510)
06/02/08 17:13:57 at oracle.oc4j.admin.internal.ApplicationDeployer.doDeploy(ApplicationDeployer.java:191)
06/02/08 17:13:57 at oracle.oc4j.admin.internal.DeployerBase.execute(DeployerBase.java:93)
06/02/08 17:13:57 at oracle.oc4j.admin.jmx.server.mbeans.deploy.OC4JDeployerRunnable.doRun(OC4JDeployerRunnable.java:52)
06/02/08 17:13:57 at oracle.oc4j.admin.jmx.server.mbeans.deploy.DeployerRunnable.run(DeployerRunnable.java:81)
06/02/08 17:13:57 at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:814)
06/02/08 17:13:57 at java.lang.Thread.run(Thread.java:534)
06/02/08 17:13:57 Caused by: java.lang.InstantiationException: Error initializing ejb-modules: [dmsap:dmsap-ejb:FacadeBean] - Unable to load ejb-class com.sjrwmd.dmsap.ejb.FacadeBean, see section 23.2 of the EJB 2.1 specificationoracle.classloader.util.AnnotatedClassFormatError: com.sjrwmd.dmsap.ejb.FacadeBean
 Invalid class: com.sjrwmd.dmsap.ejb.FacadeBean
 Loader: dmsap.root:0.0.0
 Code-Source: /C:/JDev1013/j2ee/home/applications/dmsap/dmsap-ejb.jar
 Configuration: <ejb> in C:\JDev1013\j2ee\home\applications\dmsap
 Dependent class: com.evermind.server.ejb.deployment.BeanDescriptor
 Loader: oc4j:10.1.3
 Code-Source: /C:/JDev1013/j2ee/home/lib/oc4j-internal.jar
 Configuration: <code-source> in META-INF/boot.xml in C:\JDev1013\j2ee\home\oc4j.jar
06/02/08 17:13:57 at com.evermind.server.ejb.EJBContainer.postInit(EJBContainer.java:1056)
06/02/08 17:13:57 at com.evermind.server.ApplicationStateRunning.initializeApplication(ApplicationStateRunning.java:210)
06/02/08 17:13:57 at com.evermind.server.Application.setConfig(Application.java:391)
06/02/08 17:13:57 at com.evermind.server.Application.setConfig(Application.java:308)
06/02/08 17:13:57 at com.evermind.server.ApplicationServer.addApplication(ApplicationServer.java:1771)
06/02/08 17:13:57 at oracle.oc4j.admin.internal.ApplicationDeployer.addApplication(ApplicationDeployer.java:507)
06/02/08 17:13:57 ... 6 more
06/02/08 17:13:57 Caused by: com.evermind.server.ejb.deployment.InvalidEJBAssemblyException: [dmsap:dmsap-ejb:FacadeBean] - Unable to load ejb-class com.sjrwmd.dmsap.ejb.FacadeBean, see section 23.2 of the EJB 2.1 specificationoracle.classloader.util.AnnotatedClassFormatError: com.sjrwmd.dmsap.ejb.FacadeBean
 Invalid class: com.sjrwmd.dmsap.ejb.FacadeBean
 Loader: dmsap.root:0.0.0
 Code-Source: /C:/JDev1013/j2ee/home/applications/dmsap/dmsap-ejb.jar
 Configuration: <ejb> in C:\JDev1013\j2ee\home\applications\dmsap
 Dependent class: com.evermind.server.ejb.deployment.BeanDescriptor
 Loader: oc4j:10.1.3
 Code-Source: /C:/JDev1013/j2ee/home/lib/oc4j-internal.jar
 Configuration: <code-source> in META-INF/boot.xml in C:\JDev1013\j2ee\home\oc4j.jar
06/02/08 17:13:57 at com.evermind.server.ejb.exception.ValidationExceptions.unableToLoadEJBClass(ValidationExceptions.java:36)
06/02/08 17:13:57 at com.evermind.server.ejb.deployment.BeanDescriptor.initialize(BeanDescriptor.java:298)
06/02/08 17:13:57 at com.evermind.server.ejb.deployment.ExposableBeanDescriptor.initialize(ExposableBeanDescriptor.java:158)
06/02/08 17:13:57 at com.evermind.server.ejb.deployment.SessionBeanDescriptor.initialize(SessionBeanDescriptor.java:190)
06/02/08 17:13:57 at com.evermind.server.ejb.deployment.EJBPackage.initialize(EJBPackage.java:814)
06/02/08 17:13:57 at com.evermind.server.ejb.EJBContainer.postInit(EJBContainer.java:855)
06/02/08 17:13:57 ... 11 more
06/02/08 17:13:57 Caused by: oracle.classloader.util.AnnotatedClassFormatError: com.sjrwmd.dmsap.ejb.FacadeBean
 Invalid class: com.sjrwmd.dmsap.ejb.FacadeBean
 Loader: dmsap.root:0.0.0
 Code-Source: /C:/JDev1013/j2ee/home/applications/dmsap/dmsap-ejb.jar
 Configuration: <ejb> in C:\JDev1013\j2ee\home\applications\dmsap
 Dependent class: com.evermind.server.ejb.deployment.BeanDescriptor
 Loader: oc4j:10.1.3
 Code-Source: /C:/JDev1013/j2ee/home/lib/oc4j-internal.jar
 Configuration: <code-source> in META-INF/boot.xml in C:\JDev1013\j2ee\home\oc4j.jar
06/02/08 17:13:57 at oracle.classloader.PolicyClassLoader.defineClass(PolicyClassLoader.java:2268)
06/02/08 17:13:57 at oracle.classloader.PolicyClassLoader.findLocalClass(PolicyClassLoader.java:1457)
06/02/08 17:13:57 at oracle.classloader.SearchPolicy$FindLocal.getClass(SearchPolicy.java:167)
06/02/08 17:13:57 at oracle.classloader.SearchSequence.getClass(SearchSequence.java:119)
06/02/08 17:13:57 at oracle.classloader.PolicyClassLoader.internalLoadClass(PolicyClassLoader.java:1660)
06/02/08 17:13:57 at oracle.classloader.PolicyClassLoader.loadClass(PolicyClassLoader.java:1621)
06/02/08 17:13:57 at oracle.classloader.PolicyClassLoader.loadClass(PolicyClassLoader.java:1606)
06/02/08 17:13:57 at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
06/02/08 17:13:57 at java.lang.Class.forName0(Native Method)
06/02/08 17:13:57 at java.lang.Class.forName(Class.java:219)
06/02/08 17:13:57 at com.evermind.server.ejb.deployment.BeanDescriptor.initialize(BeanDescriptor.java:296)
06/02/08 17:13:57 ... 15 more
06/02/08 17:13:57 Caused by: java.lang.UnsupportedClassVersionError: com.sjrwmd.dmsap.ejb.FacadeBean
06/02/08 17:13:57 at java.lang.ClassLoader.defineClass0(Native Method)
06/02/08 17:13:57 at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
06/02/08 17:13:57 at oracle.classloader.PolicyClassLoader.defineClass(PolicyClassLoader.java:2224)
06/02/08 17:13:57 ... 25 more
2006-02-08 17:13:57.545 NOTIFICATION Application Deployer for dmsap FAILED.
2006-02-08 17:13:57.545 NOTIFICATION Application UnDeployer for dmsap STARTS.
2006-02-08 17:13:59.045 NOTIFICATION Removing all web binding(s) for application dmsap from all web site(s)
2006-02-08 17:13:59.795 NOTIFICATION Application UnDeployer for dmsap COMPLETES.
2006-02-08 17:13:59.795 WARNING java.lang.InstantiationException: Error initializing ejb-modules: [dmsap:dmsap-ejb:FacadeBean] - Unable to load ejb-class com.sjrwmd.dmsap.ejb.FacadeBean, see section 23.2 of the EJB 2.1 specificationoracle.classloader.util.AnnotatedClassFormatError: com.sjrwmd.dmsap.ejb.FacadeBean
 Invalid class: com.sjrwmd.dmsap.ejb.FacadeBean
 Loader: dmsap.root:0.0.0
 Code-Source: /C:/JDev1013/j2ee/home/applications/dmsap/dmsap-ejb.jar
 Configuration: <ejb> in C:\JDev1013\j2ee\home\applications\dmsap
 Dependent class: com.evermind.server.ejb.deployment.BeanDescriptor
 Loader: oc4j:10.1.3
 Code-Source: /C:/JDev1013/j2ee/home/lib/oc4j-internal.jar
 Configuration: <code-source> in META-INF/boot.xml in C:\JDev1013\j2ee\home\oc4j.jar

A point of clarification: Using JDK 1.5, it compiles and "tries" to start, but then gives this error : Unable to load ejb-class com.MyTestEJB see section 23.2 of the EJB 2.1 specificationjava.lang.ExceptionInInitializerError: java.lang.NullPointerException
There are other EJB which are deploying fine.
I really can't tell why one is deploying but this one is not.
Thanks

Clarification needed on servlet class reloading

 I have a question about servlet reloading in WLS6.0
 Let's assume i have version 1.0 of a SomeServlet.class loaded in WLS.
 Client are accessing it currently.
 Now let's say i create version 1.1 of SomeServlet.class and i want to deploy it in WLS.
 I have the "servlet reloading" turned ON.
 So that means that version 1.1 will be immediately loaded by WLS right?
 Question: Will WLS first unload version1.0? If so, what happens to the clients who are using version 1.0?
 Will they get a ClassCastException? Or will they be abruptly switched from 1.0 to 1.1? Will they see any any error at all?
 Thanks.
 PS: If i had deployed the servlet in a WAR file, will the same rules apply? In other words, if i replace the WAR file will a newer version, what will happen to the classes from the previous WAR file that are being used by clients.
 Is there a document explaining "how WLS reloads/hot-deploys servlets/ejb"? I understand that WLS6.0 uses a new "classloader architecture" that is different from WLS5.1.0. Some document to explain the differences would be helpful. Thanks.


The new version will be loaded immediately into a new classloader.
 The old version will remain (in its old classloader) until there are no
 longer any references to it (which will happen when clients that were
 using the old version have completed their operations).
 mark
 Jeff Mathers wrote:
 > Did you ever get clarification on this point?
 >
 > I am trying to figure out how to force WLS 6 to reload servlets following a
 > re-compile. Your message hinted at a way to do this. Can you fill me in?
 >
 > Jeff Mathers
 > IT R&D
 > RWJPRI - Johnson & Johnson
 >
 > "R" <[email protected]> wrote in message
 > news:[email protected]...
 > >
 > > I have a question about servlet reloading in WLS6.0
 > >
 > > Let's assume i have version 1.0 of a SomeServlet.class loaded in WLS.
 > > Client are accessing it currently.
 > > Now let's say i create version 1.1 of SomeServlet.class and i want to
 > deploy it in WLS.
 > > I have the "servlet reloading" turned ON.
 > > So that means that version 1.1 will be immediately loaded by WLS right?
 > >
 > > Question: Will WLS first unload version1.0? If so, what happens to the
 > clients who are using version 1.0?
 > > Will they get a ClassCastException? Or will they be abruptly switched from
 > 1.0 to 1.1? Will they see any any error at all?
 > >
 > > Thanks.
 > >
 > > PS: If i had deployed the servlet in a WAR file, will the same rules
 > apply? In other words, if i replace the WAR file will a newer version, what
 > will happen to the classes from the previous WAR file that are being used by
 > clients.
 > >
 > > Is there a document explaining "how WLS reloads/hot-deploys servlets/ejb"?
 > I understand that WLS6.0 uses a new "classloader architecture" that is
 > different from WLS5.1.0. Some document to explain the differences would be
 > helpful. Thanks.

Implementing RelationShips.....in ejb...help

hi all,
i am developing one application using ejbs in jboss server.
here i listed 2 tables....
i developed country entity and it is working fine.Now i want to develope the countrystate enity whose primarykey is a combined field....some doubt how to specify <prim-key field>
basically i don't know how to implement relations in ejbs...handling these foreignkeys..in ejb-jar.xml.....Any one have any idea,pls guide me....
i have found some tutorials...but none gave me the idea.
any help frm anyone is appreciated....,
thanx
CREATE TABLE country
country_code varchar(3) NOT NULL,
country_name varchar(50) NOT NULL,
currency_code varchar(3) NOT NULL,
created_by varchar(20) NOT NULL,
created_on timestamptz NOT NULL,
last_modified_on timestamptz,
last_modified_by varchar(20),
CONSTRAINT pk_country PRIMARY KEY (country_code),
CONSTRAINT fk1_country FOREIGN KEY (currency_code) REFERENCES curncy (currency_code) ON UPDATE NO ACTION ON DELETE NO ACTION
CREATE TABLE country_state
country_code varchar(3) NOT NULL,
state_id varchar(5) NOT NULL,
state_name varchar(50) NOT NULL,
created_by varchar(20) NOT NULL,
created_on timestamptz NOT NULL,
last_modified_on timestamptz,
last_modified_by varchar(20),
CONSTRAINT pk_country_state PRIMARY KEY (country_code, state_id),
CONSTRAINT fk1_country_state FOREIGN KEY (country_code) REFERENCES country (country_code) ON UPDATE NO ACTION ON DELETE NO ACTION
)

<prim-key field>
field should be a class which is the primarykeyclass for the bean pertaining to the EJB specification.
in case you need more clarification please do let me know
Regards
suresh.

Jsp-ejb

 hi
 I am trying work with ejb and jsp's using WLS 6.1 but nothing seems to work ,
 with out using jsp if i am invoking ejb's by writing a simple client its working
 fine
 well here is what i have done
 i have copied the ejb remote and home interface classes into WEB-INF/classes generated
 xml files and created a jar file with extension .war
 well now i am invoking jsp by web browser but it gives a compile error package
 not found (where all the ejb classes are there)
 what should be the class path and should these ejb classes and interfaces be in
 c:bea\wlserver6.1\config.....
 path or can they be in any other path
 please clarify
 thanks


 hi again
 i tried with WEB-INF\classes\ejb1 even now i am getting the same errors
 C:\DOCUME~1\ADMINI~1.SPS\LOCALS~1\Temp\jsp_servlet\__ejb1.java:21: package ejb1
 does not exist
 probably occurred due to an error in /ejb1.jsp line 2:
 <%@ page import="javax.naming.*, javax.rmi.*, java.util.*, java.io.*,ejb1.*" %>
 C:\DOCUME~1\ADMINI~1.SPS\LOCALS~1\Temp\jsp_servlet\__ejb1.java:108: cannot resolve
 symbol
 probably occurred due to an error in /ejb1.jsp line 21:
 DemoHome dh = (DemoHome)ctx.lookup("DemoEJB");
 C:\DOCUME~1\ADMINI~1.SPS\LOCALS~1\Temp\jsp_servlet\__ejb1.java:108: cannot resolve
 symbol
 probably occurred due to an error in /ejb1.jsp line 21:
 DemoHome dh = (DemoHome)ctx.lookup("DemoEJB");
 C:\DOCUME~1\ADMINI~1.SPS\LOCALS~1\Temp\jsp_servlet\__ejb1.java:109: cannot resolve
 symbol
 probably occurred due to an error in /ejb1.jsp line 22:
 Demo d = dh.create();
 thank you
 sri
 "sri" <[email protected]> wrote:
 >
 >hi!!!
 >
 >thank you,yes i dint give the package structure i will try that out !!!
 >
 >i need further clarification regarding this please, i removed the package
 >name
 >and now the classes are in WEB-INF\classes
 >i tought it would work when i run jsp. but its giving error cant find
 >the remote
 >and home interface names...
 >
 >what would be the problem here the class files are placed in the web-inf
 >folder
 >why cant jsp find them should we do any thing else
 >
 >thanks
 >sri
 >
 >
 >"Vijay Poluri" <[email protected]> wrote:
 >>
 >>Hi Sri,
 >>
 >>Please check if the EJB classes are under the exact package structure
 >>as declared
 >>in the EJB.
 >> WEB-INF/classes/packagestructure
 >>FYI, keeping EJB interface classes in the System Classpath is not
 >recommended.
 >>
 >>Vijay
 >>Developer Relations Engineer
 >>BEA Support
 >>
 >>
 >>"sri" <[email protected]> wrote:
 >>>
 >>>hi
 >>>
 >>>
 >>>I am trying work with ejb and jsp's using WLS 6.1 but nothing seems
 >>to
 >>>work ,
 >>>
 >>>with out using jsp if i am invoking ejb's by writing a simple client
 >>>its working
 >>>fine
 >>>
 >>>well here is what i have done
 >>>i have copied the ejb remote and home interface classes into WEB-INF/classes
 >>>generated
 >>>xml files and created a jar file with extension .war
 >>>
 >>>well now i am invoking jsp by web browser but it gives a compile error
 >>>package
 >>>not found (where all the ejb classes are there)
 >>>
 >>>what should be the class path and should these ejb classes and interfaces
 >>>be in
 >>>c:bea\wlserver6.1\config.....
 >>>path or can they be in any other path
 >>>
 >>>please clarify
 >>>
 >>>thanks
 >>>
 >>>
 >>>
 >>>
 >>
 >

Weblogic7.0,DataSource,ejb

Hi all ,
I am using weblogic 7.0
I need little bit clarification in the following points.
1) Does the connection pool which is created can be displayed in JNDI Tree???
I am seeing only DataSOurce in the JNDI Tree Only.
2)In case of Bean Managed Persistance, in ejb-jar.xml,
I had given the following info.
<resource-ref>
<res-ref-name>ramukkDataSource</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
Does the <res-ref-name> refers to Datasource Name??
In weblogic-ejb-jar.xml
<reference-descriptor>
<resource-description>
<res-ref-name>ramukkDataSource</res-ref-name>
<jndi-name>ramukkpool</jndi-name>
</resource-description>
</reference-descriptor>
Here <jndi-name> refers to connection pool as per weblogic bible book.
If so when i deployed my ejb into the server iam getting Datasource cant be found.
If i had given like the following,
In ejb-jar.xml
<resource-ref>
<res-ref-name>jdbc/ramuJndi</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
In weblogic-ejb-jar.xml
<reference-descriptor>
<resource-description>
 <res-ref-name>jdbc/ramuJndi</res-ref-name>
 <jndi-name>jdbc/ramuJndi</jndi-name>
 </resource-description>
</reference-descriptor>
Then only my ejb code is successfully deploying doing some work which is as per xpectation.
Can any body tell why I have to give the same name for <res-ref-name> n <jndi-name>??
I am working on this problem from last one week. Still not found the solution.
Connection Pool Creation
GENERAL::
Name : ramukkpool
url : jdbc:mysql://localhost:3306/test
Driver Classname: com.mysql.jdbc.Driver
Properties :
user = root
Password = XXX
createTARGETS::
i had shifted myServer from left side to right side n clicked >>Apply
(Techncially can we say this as deploying the connection pool into server ???????????
If not how to deploy the connection pool into server??)
I did not get any errors in the console.
Now i am creating a datasource
CONFIGURATION:
Name : ramukkDataSource
JNDIName: jdbc/ramuJndi(Does we have to follow this convention only?? i.e JNDIName should start with jdbc/ only)
PoolName: ramukkpool
createTARGETS::
I had shifed myServer from left to right n >>Apply.
Now also i did not get any errors in the console.
Thanx(in advance),
ramu

Hi Sujith,
Get the sample examples in bea\weblogic700\samples\server\src\examples\ejb20 folder.
Create a jar or war or ear file from the java files given in the folders.
Deploy the same in ur WLS Console.
Run the client program to test the same.
Seetesh

Optimization of remote calls of EJB

Hello,
does the SAP Web AS support automatic optimization of remote calls of EJBs such that the overhead associated with remote calls is avoided iff the target EJB of the call actually runs in the same JVM (and therefore would allow a local call)? This would imply that in this case objects are passed by reference instead of by value.
To clarify: I am aware of the fact that EJBs can be called through Local and LocalHome interfaces. But that prevents the distribution of the EJBs. What I am looking for is to always use Remote and Home interface (remote call) and let the AppServer optimize the call to be virtually local if possible.
From what I know, JBoss and WebLogic support this feature. Is there anything like that for the Web AS. What do I need to configure?
Any hint is greatly appreciated. Please let me know if you need additional clarification on my question. Thanks!
With kindest regards,
Nick.

Hi Nick,
The optimizations I was talking about are a proprietary internal functionality and not something application developers can rely on. That's why they are not documented in any external documentation. According to your problem, my proposal is to declare both the remote and local interfaces of the beans and use the proper one depending on whether the bean client wants to pass parameters by value or by reference.
SAP does not have plans to dynamically (or automatically as you call it) switch from calling by value to calling by reference as this is not just a performance optimization - this breaks the functionality. If we decide to do it, we will have at least two problems:
1. Incompatibility with the RMI specification
2. Incompatibility with previous versions
As I already mentioned, there are EJB components that rely on being called by value, no matter whether the client resides in the same JVM or is a remote one.
I still cannot get your goal - both insisting on remote interfaces and expecting object-by-reference.
Best regards,
Viliana

How to pass out multiple rows from EJB method?

I need a sample for passing multiple rows from a EJB query method
(using SQLJ). All I found in existing sample code is query on a
single row and pass out as a bean class e.g Emp class with some
getXX() method.
What I'm currently doing is to convert the Iterator to a Vector
and pass the Vector out, which means I've to code a bean class,
use a Vector and later use a Enumeration to read the result. Is
there a simpler way to receive multiple rows from EJB?
In EJB:
while ( empIter.next() ) {
EmpVect.addElement( new Emp( emps.empNo(), emps.eName(),
emps.job(), emps.deptNo()) );
return EmpVect;
In client:
Vector empVect = empEJB.getEmployees(123);
Enumeration employees = empVect.elements();
while ( employees.hasMoreElements() ) {
emp = ( Emp ) employees.nextElement();
System.out.println(" " + emp.getEName());

Hi Ankit,
There is a workarround that requires some excel work.
Here you need to follow the above mentioned steps along with this you need an additional combo box (wont be displayed at runtime, it will fetch the entire data if we select blank for the first combo box).
Now suppose we are using 2 combobox C1 and C2 and our data is from B3 to F6.
Now for C1 (one we are using for selection)
1. select the labels as Sheet1!$B$2:$B$6 (a blank cell is added for all selection)
2. Insertion type as filtered Rows
3. Take source data as Sheet1!$B$2:$F$6 (includeing one blank row)
4. selected Items as none
5. for C2 labels as Sheet1!$A$3:$A$6 source data as Sheet1!$B$3:$F$6 destination as Sheet1!$B$14:$F$17.
6. Selected Item : Sheet1!$B$9 (blank Type dynamic). So it will select the entire table, if nothing is selected.
7. take a Grid component and map it to Sheet1!$H$9:$L$12. use formula as =IF(IF($B$9="",B14,B9)=0,"",IF($B$9="",B14,B9)) on cell H9. Where we take H6 to L12 as final data set. Tis will become the data for next set fo Combo box for further selection.
8. follow the same steps for other combobox selections.
9. control the dynamic visibility of grids on the basis of Destination cell (like B9).
Revert if you need further clarification.
Regards,
Debjit

Getting logged in user id in EJB

Hi All,
I have a session bean which will be exposed as webservice and will be consumed in webdynpro. Both by EJB and webdynpro are running on the same WAS . Is it possible to retrive the logged in portal user id in the EJB insted of webdynpro . if so can you please provide how it can be done.
Regards,
Raj
Edited by: Raj A on May 27, 2008 6:02 AM

I found this WIKI and thread
retriving user details from user rofile in portal database
/people/sap.user72/blog/2005/06/05/user-management-api-in-webdynpro
Which says that below code
IUser iUser = user.getSAPUser();
getSAPUser() method, though it says SAP User it's not direct retireval from ABAP, it's from SAP Web App Server user which could be any datasource (R/3, LDAP, Portal UME).
If you read in the blog right at the bottom in the user comments sections you will find clarification on getSAPUser and portal user. This answers my question that I can use user.getSAPUser() method irrespective of user datasource(r/3, LDAP, UME).
If my understanding is wrong please advise. I'm marking this thread answered.
Thanks
Praveen
Edited by: Praveen11 on Oct 16, 2009 3:14 AM

JNDI / EJB deployment and clustering

I'm aware that replication isn't supported for stateful EJBs. But the
 "serialization of the handle isn't supported" statement has me concerned.
 So I'm looking for a little clarification on this scenario:
 Let's say I've got a stateful session bean, which is accessed from a
 servlet. For performance reasons, you want to find the colocated instance -
 the smart stub should do this, right? To have it colocated in all
 instances, then I need to deploy it into each server of the cluster. This
 essentially bind()/rebind()'s (whichever call the container does during a
 deploy operation) the EJB n times. Does each of those JNDI bind/rebind
 calls "overwrite" the previous one, or does the replicated JNDI tree somehow
 "keep" all the entries?
 What happens if I bind/rebind "non-cluster enabled" objects into the JNDI
 tree in each server to the same name (like a reference data table - doesn't
 really need to be an RMI object, one per server is fine)? Will they get
 "overwritten"? Should I need to take into account the server name when
 binding into the tree, and then also use that for subsequent lookups?
 Thanks for any input!
 --Jason


Guys,
Thanks for the information.
The problem was that classpath, some other packages required for the Bean
were not in the weblogic\classes directory.
so that was it.
Thanks
/selvan
Murali Krishna Devarakonda wrote in message
<7qjkr1$7dl$[email protected]>...
Are you using the HOT DEPLOY feature(startweblogic.bat does it)?
Then you could go to the WebLogic Console, select the Bean, and Redploy.
You could also do it from a command line utility "weblogic.deploy".
If you didn't start the server with the hot deploy, you need to restartyour
server after any changes.
You should read the weblogic docs on the Hot Deploy feature. A different
classloader is used for it. Also, the standard weblogic classpath cannot
coexist with it.
Hot Deploy uses: (assuming your weblogic installation is in D:/WebLogic
D:\WebLogic\classes/boot
It will throw an exception if you have D:\weblogic\classes or
D:\WebLogic\lib\weblogicaux.jar in the system classpath. You need to use
the weblogic.classpath instead.
Regards,
Murali Krishna Devarakonda
Tamilselvan Ramasamy <[email protected]> wrote in message
news:7qi0ln$kpc$[email protected]..
Hello,
I have created bunch of EJB Components and deployed for WLS4.0 using the
following way. It works fine under WLS4.0
To compile java code -> javac *.java
Create SER file -> java weblogic.ejb.utils.DDCreator -d .
DeploymentDescriptor.txt
Create JAR file -> jar cmf manifest Bean.jar /directory
EJBC and deployment -> java weblogic.ejbc -d /targetDirectory Bean.jar
and also add an entry in the welogic.properties file
weblogic.ejb.deploy= ...
When I do the samething in the WLS4.5, it doesn't work, first of all,
JNDI
is not finding the home interface. It throws a naming Exception
please give me an idea hw do I deploy my Beans in the WLS4.5 using the
command line option. I don't have Visual Cafe to do that automatically.So
I
have to do that manually.
Thanks
/selvan
Captura Software Inc
[email protected]

Missing oracle.toplink.ejb.cmp3.EntityManagerFactoryProvider

I have been trying to use Toplink 11G with Spring 2.5 and when I wire it up according to the Oracle JPA/Toplink article I get a class not found error. When I look at the toplink.jar the EntityManagerFactoryProvider its looking for its not there but the oracle.toplink.internal.ejb.cmp3.EntityManagerFactoryProvider exists instead.
When I look at the toplink.jar shipped with jdeveloper 11 TP2 the EntityManagerFactoryProvider is there. Am I missing a jar?

TopLink Essentials was intended to be a JPA implementation that offered most of what was needed by an average application that needed ORM. It was a pared down version derived from TopLink code and was never intended to include full TopLink functionality.
The official plan of record (not just my opinion) is that both TopLink and EclipseLink will be shipped in 11g, but in future releases the TopLink product will be composed of the EclipseLink code base plus some server integration code.
I don't know what the rules are with your client, but a) Oracle is the lead of the EclipseLink project and b) Oracle will be shipping it in 11g, so my personal opinion is that you should be able to consider it part of the Oracle stack.
As an open source project the usual kinds of support will be available (forums, etc.) but assuming that your client has an Oracle support contract then I would guess (personal opinion again) that if they are using 11g then they would also be entitled to official support on the version of EclipseLink that is shipped with 11g, anyway.
In the end you should check with your client but if they (or you) have any questions then they (or you) can always contact us for clarification.

Clarification on EJB

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