Error trying to deserialize EJB HomeHandle and EJB Handle classes

I get the following exception when I try to deserialize both a javax.ejb.HomeHandle and a javax.ejb.Handle. I serialize and immediately deserialize within the same application using the same classloader so there are not alot of external variables that may cause the problem. Any ideas on why I can't deserialize an ejb handle?
The reason I am doing this is to try and get around the need to reference another application just to call a remote method in that application. I want to serialize the remote home interface handle or the remote component interface handle and deserialize it using my local application classloader. Does anybody know if this would work?
#1#java.lang.ClassNotFoundException: Loader /L_service:ejb could not load class turtle.registry.SBRegistryRemoteHome
     at com.sap.vmc.core.impl.sapjvm.sharing.NativeSharedClassLoaderImpl.loadClass(NativeSharedClassLoaderImpl.java:609)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:265)
     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:333)
     at java.lang.Class.forName0(Native Method)
     at java.lang.Class.forName(Class.java:242)
     at java.io.ObjectInputStream.resolveProxyClass(ObjectInputStream.java:656)
     at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1499)
     at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1462)
     at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1698)
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1304)
     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:349)
     at com.sap.engine.services.ejb3.runtime.impl.LocalHandleDelegate.readStub(LocalHandleDelegate.java:177)
     at com.sap.engine.services.ejb3.runtime.impl.ServerHandleDelegate.readStub(ServerHandleDelegate.java:64)
     at com.sap.engine.services.ejb3.runtime.impl.LocalHandleDelegate.readEJBHome(LocalHandleDelegate.java:101)
     at com.sap.engine.services.ejb3.runtime.impl.StatelessHomeHandleImpl.readObject(StatelessHomeHandleImpl.java:73)
     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 java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946)
     at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1818)
     at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1718)
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1304)
     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:349)
     at turtle.common.util.SerializationHelper.convertObject(SerializationHelper.java:43)
     at turtle.common.server.connect.RemoteFactory.getRemoteSAPWAS(RemoteFactory.java:206)
     at turtle.common.server.connect.RemoteFactory.getRemote(RemoteFactory.java:46)
     at turtle.common.server.connect.RemoteProxyFactory.getRemote(RemoteProxyFactory.java:99)
     at turtle.common.server.connect.RemoteProxyFactory.create(RemoteProxyFactory.java:91)
     at turtle.common.server.connect.RemoteProxyFactory.createProxy(RemoteProxyFactory.java:52)
     at turtle.server.runtime.registry.RegistryFacade.connectToRegistry(RegistryFacade.java:932)
     at turtle.server.runtime.registry.RegistryFacade.getGenericRegistryBI(RegistryFacade.java:987)
     at turtle.server.runtime.registry.RegistryFacade.unbindObjectsInProject(RegistryFacade.java:857)
     at turtle.registry.ProjectRegistrar$1$1.run(ProjectRegistrar.java:130)
     at java.security.AccessController.doPrivileged(Native Method)
     at javax.security.auth.Subject.doAs(Subject.java:337)
     at turtle.common.security.auth.AuthenticatorBase.doAs(AuthenticatorBase.java:387)
     at turtle.registry.ProjectRegistrar$1.run(ProjectRegistrar.java:172)
     at java.util.TimerThread.mainLoop(Timer.java:512)
     at java.util.TimerThread.run(Timer.java:462)

Has anyone been able to get this to work? Or can anyone confirm that this is a bug?
As a simpler test, I modified the UserManagementBean of the Car Rental example application. I added some code in the register method that serializes and deserializes the Handle object obtained from the SessionContext.getEJBObject().getHandle() method. The serialization completes without issue. However, I get the same error when trying to deserialize the Handle object:
java.lang.ClassNotFoundException: Loader /L_service:ejb could not load class com.sap.engine.examples.epf.ejb.controller.customer.UserManagementHome
     at com.sap.vmc.core.impl.sapjvm.sharing.NativeSharedClassLoaderImpl.loadClass(NativeSharedClassLoaderImpl.java:609)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:265)
     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:333)
     at java.lang.Class.forName0(Native Method)
     at java.lang.Class.forName(Class.java:242)
     at java.io.ObjectInputStream.resolveProxyClass(ObjectInputStream.java:656)
     at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1499)
     at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1462)
     at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1698)
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1304)
     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:349)
     at com.sap.engine.services.ejb3.runtime.impl.LocalHandleDelegate.readStub(LocalHandleDelegate.java:177)
     at com.sap.engine.services.ejb3.runtime.impl.ServerHandleDelegate.readStub(ServerHandleDelegate.java:64)
     at com.sap.engine.services.ejb3.runtime.impl.LocalHandleDelegate.readEJBHome(LocalHandleDelegate.java:101)
     at com.sap.engine.services.ejb3.runtime.impl.StatelessHomeHandleImpl.readObject(StatelessHomeHandleImpl.java:73)
     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 java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:946)
     at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1818)
     at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1718)
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1304)
     at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1917)
     at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1841)
     at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1718)
     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1304)
     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:349)
     at com.sap.engine.examples.epf.ejb.controller.customer.SerializationUtils.deSerialize(SerializationUtils.java:33)
     at com.sap.engine.examples.epf.ejb.controller.customer.SerializationUtils.deepClone(SerializationUtils.java:59)
     at com.sap.engine.examples.epf.ejb.controller.customer.UserManagementBean.register(UserManagementBean.java:75)

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hi,
i am not able to use the patch. there are always missing files and i dont know the path for this files.
here is the output of the console:
patch -p1 -i /home/felix//Desktop/vmware-workstation-6.5.1.126130-2.6.29_x86_64.patch
can't find file to patch at input line 4
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
|diff -Naur orig/vmblock-only/include/compat_wait.h new/vmblock-only/include/compat_wait.h
|--- orig/vmblock-only/include/compat_wait.h 2008-10-28 22:47:20.000000000 -0700
|+++ new/vmblock-only/include/compat_wait.h 2009-01-20 04:49:44.000000000 -0700
File to patch:
Skip this patch? [y] y
Skipping patch.
1 out of 1 hunk ignored
can't find file to patch at input line 19
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
|diff -Naur orig/vmci-only/include/compat_wait.h new/vmci-only/include/compat_wait.h
|--- orig/vmci-only/include/compat_wait.h 2008-10-28 22:47:21.000000000 -0700
|+++ new/vmci-only/include/compat_wait.h 2009-01-20 04:49:44.000000000 -0700
File to patch: y
y: No such file or directory
Skip this patch? [y]
Skipping patch.
1 out of 1 hunk ignored
can't find file to patch at input line 34
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
|diff -Naur orig/vmmon-only/include/compat_wait.h new/vmmon-only/include/compat_wait.h
|--- orig/vmmon-only/include/compat_wait.h 2008-10-28 22:47:18.000000000 -0700
|+++ new/vmmon-only/include/compat_wait.h 2009-01-20 04:49:44.000000000 -0700
File to patch:
Skip this patch? [y] y
Skipping patch.
1 out of 1 hunk ignored
can't find file to patch at input line 49
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
|diff -Naur orig/vmmon-only/include/x86apic.h new/vmmon-only/include/x86apic.h
|--- orig/vmmon-only/include/x86apic.h 2008-10-28 22:47:17.000000000 -0700
|+++ new/vmmon-only/include/x86apic.h 2009-01-20 04:49:44.000000000 -0700
File to patch:
Skip this patch? [y] y
Skipping patch.
1 out of 1 hunk ignored
can't find file to patch at input line 64
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
|diff -Naur orig/vmmon-only/linux/driver.c new/vmmon-only/linux/driver.c
|--- orig/vmmon-only/linux/driver.c 2008-10-28 22:47:18.000000000 -0700
|+++ new/vmmon-only/linux/driver.c 2009-01-20 04:49:44.000000000 -0700
File to patch:
Skip this patch? [y] y
Skipping patch.
1 out of 1 hunk ignored
can't find file to patch at input line 85
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
|diff -Naur orig/vmmon-only/linux/hostif.c new/vmmon-only/linux/hostif.c
|--- orig/vmmon-only/linux/hostif.c 2008-10-28 22:47:17.000000000 -0700
|+++ new/vmmon-only/linux/hostif.c 2009-01-20 04:49:44.000000000 -0700
File to patch:
Skip this patch? [y] y
Skipping patch.
4 out of 4 hunks ignored
can't find file to patch at input line 173
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
|diff -Naur orig/vmmon-only/linux/vmmonInt.h new/vmmon-only/linux/vmmonInt.h
|--- orig/vmmon-only/linux/vmmonInt.h 2008-10-28 22:47:17.000000000 -0700
|+++ new/vmmon-only/linux/vmmonInt.h 2009-01-20 04:49:44.000000000 -0700
File to patch:
Skip this patch? [y] y
Skipping patch.
1 out of 1 hunk ignored
can't find file to patch at input line 188
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
|diff -Naur orig/vmnet-only/bridge.c new/vmnet-only/bridge.c
|--- orig/vmnet-only/bridge.c 2008-10-28 22:47:18.000000000 -0700
|+++ new/vmnet-only/bridge.c 2009-01-20 04:49:44.000000000 -0700
File to patch:
Skip this patch? [y] y
Skipping patch.
1 out of 1 hunk ignored
can't find file to patch at input line 203
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
|diff -Naur orig/vmnet-only/compat_wait.h new/vmnet-only/compat_wait.h
|--- orig/vmnet-only/compat_wait.h 2008-10-28 22:47:19.000000000 -0700
|+++ new/vmnet-only/compat_wait.h 2009-01-20 04:49:44.000000000 -0700
File to patch:
Skip this patch? [y] y
Skipping patch.
1 out of 1 hunk ignored
can't find file to patch at input line 218
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
|diff -Naur orig/vmnet-only/driver.c new/vmnet-only/driver.c
|--- orig/vmnet-only/driver.c 2008-10-28 22:47:19.000000000 -0700
|+++ new/vmnet-only/driver.c 2009-01-20 04:49:44.000000000 -0700
File to patch:
Skip this patch? [y] y
Skipping patch.
1 out of 1 hunk ignored
can't find file to patch at input line 235
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
|diff -Naur orig/vmnet-only/netif.c new/vmnet-only/netif.c
|--- orig/vmnet-only/netif.c 2008-10-28 22:47:18.000000000 -0700
|+++ new/vmnet-only/netif.c 2009-01-20 04:49:44.000000000 -0700
File to patch:
Skip this patch? [y] y
Skipping patch.
4 out of 4 hunks ignored
can't find file to patch at input line 286
Perhaps you used the wrong -p or --strip option?
The text leading up to this was:
|diff -Naur orig/vsock-only/include/compat_wait.h new/vsock-only/include/compat_wait.h
|--- orig/vsock-only/include/compat_wait.h 2009-01-20 14:11:34.000000000 +0100
|+++ new/vsock-only/include/compat_wait.h 2009-01-20 14:51:05.000000000 +0100
File to patch:
Skip this patch? [y] y
Skipping patch.
1 out of 1 hunk ignored
thanks
felix

Error trying to run "Measurement and Automation"

I recently purchased a PCI-6014 DAQ in an attempt to save time but along with many others we've exprerienced nothing but problems with it, including problems with the board itself and now with the NI-DAQ software. My most recent problem, which I've unsuccessfully tried to debug is an error message when trying to access "Measurement & Automation" as follows: "The instruction at 0X73DD8789 referenced memory at 0X04781D70. The memory could not be read. Click OK to terminate the program". Any suggestions or should I cut my loses and move on to another test approach as I'm already far behind schedule?

Hi cmm-
What type of operations are you trying to perform when you run into this error? It sounds like your NI-MAX installation may have become corrupted. I would suggest reinstalling NI-DAQmx 7.5. This driver install will install full support for your board as well as the newest version of NI-MAX to make sure that all files are up to date and uncorrupted.
You should first uninstall any versions of NI-DAQ and NI-MAX under the "National Instruments Software" section of Add/Remove Programs in the Control Panel. Have you had any luck in attempting to access the software on another machine or with other NI DAQ cards?
Please give these suggestions a try and let us know if you are still seeing problems.
Thanks-
Message Edited by Tom W. on 09-01-2005 01:36 PM
Tom W
National Instruments

Getting an error trying to extract CS6 Web and Design Premium after downloading

Hi, I purchased the CS6 Web and Design Premium back in 2013 and I have installed it on my laptop successfully. I got a new Windows desktop PC this year and I'm trying to install this on here without any success. I have downloaded the two files from the "Download CS6 Products" page on Adobe's website, but when I try to open the .exe file, I come up with an error saying "A problem occurred while extracting some files. Check available space on your computer and write privileges on the destination folder." I have no idea what this means or what I'm doing wrong? I would appreciate any help since I've been trying to get this working for about an hour with no progress at all.

make sure you downloaded both files completely and that they match.
if you're not sure how to do that or you think you have done that, what files (name and extension) and what file sizes did you download?

Many EJB's and ejb-jar.xml

I will have about 20 EJB's who have relationships with each other.
Now all those EJB's come in the same deployment descriptor, causing it to grow to over 2000 lines.
Is it possible to split the ejb-jar.xml in several ejb-jar.xml's? One for every EJB or one for every EJB group as a business object pattern.
Or is there another solution?

No - this is a case of "what you sow, you reap." In other words, if you have that many relations, you have a large ejb-jar.xml, since all the Entities involved in the relations must be in the same .jar file. What I would try to do is break down the relations into logical groupings and, ideally, those groups would not have relations with each other. Then split those groups out into separate deployments. Or if the relation between two groups is "light" (maybe only one), you can manually handle the relation through remote calls, instead of using CMR.

EJB-QL and ejb-name bug

Hi,
I think I found a bug when using EJB-QL with oc4j.
If the name of your bean (<ejb-name> tag) is set to something with a "dot". E.g. "mytests.MyLocalBean" then the finder methods (using EJB-QL) will return an SQL exception. The exception says that no table named "MyLocalBean" can be found. The "mytests" prefix seems to be missing in the dynamically generated SQL statement.
If I change the bean name to "MylocalBean" everything works fine.
I'm currently using Iterbase DB, but I think this is an error in the oc4j container.
/johan

Johan -- I will take a look at it.
Thanks -- Jeff

Error when @Singleton in Glassfish v3 and weld. CDI not working for EJBs.

Hello,
I am getting the following error when deploying a web app with a SSB with the @Singleton annotation. If I use javax.ejb.Singleton I get the error. If I use @Stateless and @Singleton with javax.inject.Singleton, I don't.
I use Glassfish v3 with weld.
[#|2009-12-19T01:29:19.423+0100|SEVERE|glassfish|global|_ThreadID=16;_ThreadName=Thread-1;|The annotation symbol defined in super-class is not compatible with Session ejb ElaphusManager.
symbol: TYPE location: class com.cervatoh2.elaphus.ejb.ElaphusManagerBean
By the way,
what is the right way to install weld into glassfish? To make @Named work I had to treat Glassfish v3 as if it was Tomat:
          <listener>
                    <listener-class>org.jboss.weld.environment.servlet.Listener</listener-class>
               </listener>
          <resource-env-ref>
<description>Object factory for the CDI Bean Manager</description>
<resource-env-ref-name>BeanManager</resource-env-ref-name>
<resource-env-ref-type>javax.enterprise.inject.spi.BeanManager</resource-env-ref-type>
</resource-env-ref>
And also add weld-servle.jar to /WEB-INF/lib
isn't Glassfish v3 supposed to have builtin weld support?
thanks for any directions,
Ignacio

Well,
I think I have understood what the problem is, and maybe also a patch for it.
I have observed the exact same scenario as you guys.
I think the problem is exposed by the statement in the status.conf file:
rwConnStart message=All 1 wget requests did not return a valid vpnserver.conf
The contents of the vpnserver.conf file in your case is:
Which I also have observed. Now, I have just had a session, where one of my colleagues have a succesfull connection and I have a failed one. Now, his vpnserver.conf was:
version=1
msgtype=configuration
conn xxxxx_rw
presharedkey=xxxxxxxxxxxxxxxxxxx
rightsubnet=xxx.xxx.xxx.xxx/xx
remotelanip=xxx.xxx.xxx.xxx
dnsserver=xxx.xxx.xxx.xxx
domain=
which is somewhat different. Mine was like the failing one you had. This made me think. The client is supposed to download vpnserver.conf via HTTPS and save it. Sometimes this goes wrong, and I think it is the router software that gets confused.
It simply thinks you are trying to remote mgmt it and sends you the html to go to the welcome.html page. In my setup I have enabled HTTPS and disbaled Remote MGMT. So it should never ever think it is being remotely managed, but somehow it does that - doh!
Thus, either the SW on the router is confused/buggy and this causes it to give you a HTML respond instead of the contents of the vpnserver.conf file. Another explanation could be that the wget tool has a problem, when a vpnserver.conf file already exists and then it doesn ensure to force download the file correctly or something.
Nevertheless, I have two ways to solve this problem:
1. Rebooting the router has worked for me, but is of course not nice
2. Delete the local version of vpnserver.conf BEFORE you try to connect.
The 2nd solution has not yet been verified to work in a broader scale, but we are trying to verify it.
Please report if this helps you guys.
Thanks, Jacob

Error when One EJB calls anothe EJB

Hi,
I got the following error when I use one EJB call another EJB in OAS 4.0.8.1, the code is developed in JDeveloper 3.0/Win NT 4.0/SP5.
Can anyone give me some ideas? or is there any samples in this case?
Thanks a lot!
Creating an initial context
Looking for the EJB published as 'APP/APPEJB'
Creating a new EJB instance
Calling APPEJB methods...
CORBA: org.omg.CORBA.BAD_OPERATION: ; nested exception is:
org.omg.CORBA.BAD_OPERATION:
java.rmi.ServerException: CORBA: org.omg.CORBA.BAD_OPERATION: ; nested exception is:
org.omg.CORBA.BAD_OPERATION:
at javax.rmi.oas.corba.CorbaRemoteExceptionHelperValue.OBVObjFrom(Compiled Code)
at TwoEJB._stub_APPEJB.callEJBMapping(Compiled Code)
at TwoEJB.TwoEJBClient.main(Compiled Code)
null

Home handle is an object that identifies an enterprise bean. A client may serialize the handle, and then later deserialize it to obtain a reference to the enterprise bean.
The javax.ejb.HomeHandle is similar to javax.ejb.Handle. Just as the Handle is used to store and retrieve reference to EJB objects, the HomeHandle is used to store and retrieve remote references to EJB homes. HomeHandle can be stored and later used to access an EJB home remote refrence the same way that a Handle can be serialized and later used to access an EJB object's remoe reference.
import java.io.*;
import javax.ejb.EJBHome;
import javax.ejb.HomeHandle;
public class WorkingWithEJBHandles {
public static void main( String[] args ) throws Exception {
EJBHome aHome = null;
// get hold of a home interface
HomeHandle handle = aHome.getHomeHandle();
ByteArrayOutputStream bos = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream( bos );
oos.writeObject( handle );
byte[] handleAsBytes = bos.toByteArray();
// store in the database, on file. howwever you want
FileInputStream fis = new FileInputStream( "fileobj" );
ObjectInputStream ois = new ObjectInputStream( fis );
HomeHandle theHandle = (HomeHandle) ois.readObject();
// get back the EJBHome from the HomeHandle
aHome = theHandle.getEJBHome();
// the same kind of logic also holds for EJBHandles, as well as
// HomeHandles
Transfer Object is a Design pattern. Refer to Core J2EE Design Pattern.
http://java.sun.com/blueprints/corej2eepatterns/Patterns/TransferObject.html
Rgds,
Seetesh

EJB 3.0 @Stateless @EJB @Resource and JNDI clarity..

Hi,
I am trying to configure an EJB 3.0 but not able to do so properly.
I have a single business interface and 2 bean implementation class of the same business interface doing different things. How do I access the EJB's if I have the same business interface class.I am getting JNDI error while trying to lookup.
Also what does the "name" and "mappedName" in @Stateless(name ="...",mappedName="") signify.
Then in case of Dependency injection,how should I look for the EJB? What would be it's JNDI name in this case?
@EJB(name="",beanName="",mappedName="")
private HelloEJB hello;
What does the name,benaName and mappedName in case of an @EJB annotation signify??
Please clear me with these attributes of @Stateless and @EJB and @Resource. I am getting toatlly confused with what should be the logic name and what is the JNDI name????
Thanks

In @Stateless, @name() is the annotation equivalent of <ejb-name> in ejb-jar.xml. It gives a unique bean name identifier to the component within the ejb-jar. It is completely independent of mappedName. If no @Stateless name() is specified, it defaults to the unqualified bean class name.
In @Stateless, mappedName() is used to assign a global JNDI name to the bean's remote interface. This can be used to explicitly lookup the EJB reference to that interface or as one way to resolve a caller's EJB dependency.
In @EJB, if the target of the dependency lives within the same application, you can always fully resolve it using only beanName(). beanName() takes the value specified in @Stateless name(), or the default as described above.
@EJB name() assigns a name to the client dependency within the caller's component environment. It is optional. In most cases that value doesn't matter since if the dependency is being injected you never have to refer to the name() attribute anywhere else.
@EJB mappedName() is used to resolve an EJB dependency that spans applications. It holds a global JNDI name, e.g. the one specified in @Stateless mappedName(). mappedName() is not required to be supported by all vendors.
So, to sum it all up, it's fine to have two different beans that expose the same interface. E.g. :
@Stateless(name="A1", mappedName="A1Global")
public class A1 implements A { ... }
@Stateless(mappedName="A2Global") // name() defaults to "A2"
public class A2 implements A { ... }
In a caller within the same application :
@EJB(beanName="A1")
private A a;
@EJB(beanName="A2")
private A a;
In a caller within a different application :
@EJB(mappedName="A1Global")
private A a;
@EJB(mappedName="A2Global")
private A a;
You can find additional information in our EJB FAQ :
https://glassfish.dev.java.net/javaee5/ejb/EJB_FAQ.html#EJB_ejb-ref_ejb_local_ref

Error trying to deserialize EJB HomeHandle and EJB Handle classes

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