It's a WebService and a Stateless Session bean

Ok,
I have a Stateless Session Bean that have annotated as a @WebService.
@Stateless
@WebService
public class TravelAgentWSBean {
I only call it as a WebService, never as a StatelessSessionBean. Do I get the exact same transactional behaviour as if it was a Stateless Session Bean?
Thanks.

You could try it like this
<c:catch var="formatError">
<fmt:formatNumber value="${row.payment}" type="currency" currencySymbol="" var="pay"/>
</c:catch>
<c:if test="${not empty formatError}">
Error formatting value <c:out value="${row.payment}"/>
</c:if>

Similar Messages

Implementing Web Service with Stateless Session Bean

I have a web service that I've built using the WorkSpace Studio tools (create a WSDL, generate the Java code from the WSDL, fill in the skeleton methods in the service implementation class). This service is deployed as a web module within an EAR to WebLogic Server 10.0 and is working great as a web service.
I'd like to be able to also call the operations on this service via an EJB interface (from a different application on the same server). I followed the guidelines for adding EJB annotations to the web service implementation class (from [http://edocs.bea.com/wls/docs100/webserv/jws.html#wp215790]). I added the @Session annotation to the class, implemented javax.ejb.SessionBean, and added the ejbXXX() methods. This all makes perfect sense, and looked like it was going to work. However, WorkSpace Studio now gives me a compile error on the class that says "EJB backed WebServices are not supported."
A few internet searches for that error didn't return anything relevant.
It seems like I followed the instructions correctly. Is there a better way to build a service like this that is both a web service endpoint and a stateless session bean?
Thanks!
-Eric

Having separate EJB and web modules certainly makes things easier, but I have non-trivial (i.e. not feasible to copy) application logic that I'd like to expose with both a bean interface (for intra-application usage) and a web service interface (for public consumption).
I've tried starting with a "web application" WorkSpace Studio project and adding bean annotations. This produces the error I originally described. I also tried starting with an "EJB" WorkSpace Studio project and adding web service annotations. This fails at deployment time with errors about missing web service descriptors (the error is correct - the web-service-related descriptor elements are missing from the deployment descriptors).
The documentation explicitly presents this as an option (annotating a class with both web service and session bean annotations), but how does one actually make this work?

Trying to call stateless session bean from MDB

Folks,
Am working on RAD and WAS 8.
I have an MDB. And a stateless session bean (AOBean under EJB project).
While the listener listens to the messages from queue, it also tries to persist to db. I want to achieve this via a method of AOBean (through instantiating session bean or by injection).
I have been sucessful by invoking a method from AOBean class - that method just returns a string (without any objects being passed)
Problem:
I am getting IllegalStateException when I try to invoke a method of AOBean class, that has an object as a parameter
For eg:
MDB
@EJB(name="ejb/TransactionMgrAOBean", mappedName="ejb/TransactionMgrAOBean")
ITransactionMgrAO tranAO;
    public void onMessage(Message message) {
     TextMessage textMessage = (TextMessage) message;
     boolean status = false;
try {
   TransactionVO tranVO = getTransactionVO();//Here building the object to be passed to session bean
   String status1 = tranAO.getVersion(tranVO);
}catch(Exception e){
AOBean
@Stateless
@Remote({ ITransactionMgrAO.class })
@WebService
public class TransactionMgrAOBean {
public String getVersion(TransactionVO tranVO) throws Exception{
try{
//business logic
} catch(Exception e){
throw e;
return true;
TransactionVO implements Serializable has also inner static classes that are not Serializable.
EXCEPTION: At runtime we are getting exception saying that the inner classes are not serialized.
REASON why we are invoking session bean from MDB? We found that if we invoke any service from AOBean the transaction management was successful. We are using sessionContext.setRollBackonly when an exception occurs. Tranasactions are not rolled back when any db exception occurs if we invoke business logic methods from Model layer of another NON-EJB package.
Hope I have provided enough information!

My concret problem is that I want to call an ejb session contained in an ejb project from a session bean in a different web project. When I include the code in my web session bean I get the error adjunted:
- Code:
@EJB
private UserRemote userSessionBean;
- Error:
Exception Details: javax.naming.NameNotFoundException
pac.UserRemote#pac.UserRemote not found
Possible Source of Error:
Class Name: com.sun.enterprise.naming.TransientContext
File Name: TransientContext.java
Method Name: doLookup
Line Number: 216
Any suggestion?

EJB 3.1new instance of stateless session bean not created on new invocation

I am using Netbeans 6.8 bundle that comes with JAVA EE 6. I have created a web application then created restful web services and then created few stateless session beans (with local interfaces) that are invoked from restful web services. From the browser, when I call the url with get method, restful web services are being invoked and they in turn calls stateless session beans and does the appropriate business logic. While testing, I observed that for every new url call from the browser, the same bean is being invoked. I tested this by adding a instance variable vector and adding one item ('test") to the vector in bean's method. My understanding is that on every bean's method invocation the vector should have only one item. However, the vector is growing with many "test" items. I am literally confused, not sure this is the way it is supposed to work. I tried to invoke bean's method from restful web service by using both dependency injection and jndi look up, both instances the vector is growing with many "test" items.
I would really appreciate if some body gives me more insight.

I appreciate your answers. There is a strong reason for posting this question. Basically, I am using JPA and using stateless session beans to invoke database calls. In the bean I am using the following code for entity manager.
@PersistenceContext(unitName = "AsgProtocolServerPU")
private EntityManager em;
I have noticed very strange scenario while getting records. From the application, I have obtained few records of a table. Then, I manually deleted few records from the table. Very strangely, I have obtained the deleted records during my next call to bean. After 2 hours, I tested the same and did not get those records. This is not consistent.
I am totally confused. I am just wondering this is happening because I made beans local (not remote) and placed them in the web application (Java EE6 allows this). I am not sure whether this is JPA related issue or beans issue.

Stateful/Stateless Session Bean combination

Hi.
Im in the process of designing a small card game(2-4 concurrent players), and I need to keep the state stored somewhere. I was thinking about putting most of the functionality together with state in a stateful session bean, but that doesnt scale very well.
Another option is to have the state stored on the client side and use stateless session beans, but then I have to pass state data on every method call.
I was thinking of another solution, using small light-weight stateful session beans to hold the state information, and link them to stateless session beans who do the hard work(with local interfaces).
Is this a good solution which will scale well?
How many bytes of memory do you think a SFSB with a couple of strings or integers + a reference to a SLSB will take? Thank you.

Hint:
To improve performance, you might choose a stateless session bean if it has any of these traits:
- The bean's state has no data for a specific client.
- In a single method invocation, the bean performs a generic task for all clients. For example, you might use a stateless session bean to send an email that confirms an online order.
- The bean fetches from a database a set of read-only data that is often used by clients. Such a bean, for example, could retrieve the table rows that represent the products that are on sale this month.
http://java.sun.com/j2ee/1.4/docs/tutorial-update2/doc/EJBConcepts3.html

How to use jta in toplink and stateless session bean EJB 3.0?

I have an application with techologies jsf,stateless session bean, adf, toplink
generated by toplink workbench.
In web side ı want to use two methods in stateless session bean which are updated
different tables. I call these methods in my page backing bean.
I also want to JTA in web side. My first methods is done correctly, but second method has an error. I wanto to rollback all transaction.
How can ı do that? with using JTA in Toplink...

Yuichi
Did you manage to solve this? I'm doing something similar and seeing the same problem, although they're up to 7.3 SP7.
Any help greatly appreciated.
Lewis

Hot delpoyment with TopLink and Stateless Session Beans

What is the recommended procedure for making hot deployment of Stateless session beans work with toplink in WLS 7.0sp1 and oc4j (9.0.3)
My current setup is as follows using WLS 7.0sp1:
A stateless session bean is accessing toplink enabled persistent java classes via the SessionManager. I'm currently using the class loader of the stateless session bean:
* Method in stateless session bean
* Return the TopLink Session (based on the wls stateless session bean demo)
public Server getSession() {
return (Server)SessionManager.getManager().getSession("ejb_sessionbean", this.getClass().getClassLoader());
Everything is working as such. My session bean can read and write the persistent java classes. However if I redeploy the stateless session bean jar file the toplink session is not reinitalized. This means that new settings in the session.xml are not used. I addition I get other errors.
I'm having toplink on the server classpath. The toplink enabled persistent classes are in the stateless session bean jar file.
Thanks
Henrik

What is the recommended procedure for making hot deployment of Stateless session beans work with toplink in WLS 7.0sp1 and oc4j (9.0.3)
Everything is working as such. My session bean can read and write the persistent java classes. However if I redeploy the stateless session bean jar file the toplink session is not reinitalized. This means that new settings in the session.xml are not used. I addition I get other errors.
I'm having toplink on the server classpath. The toplink enabled persistent classes are in the stateless session bean jar file.Henrik,
This is a recent post note I found on the same topic:
It all hinges on whether the TopLink ServerSession class has
been loaded by a classloader which is actually thrown away
during the hot deployment process. If this is the case, then
hot deployment causes the ServerSession to go out of scope
and finalize methods take care of logging it out properly.
If you deploy your TopLink Project on the Sytem class path then
it definately won't work. You'd have to restart the server every time.
But if the TopLink Project is deployed inside of an .ear file
and if you pass the correct ClassLoader to the
SessionManager.getSession( .... ) call then TopLink Session will
be re-started when you hot deploy the .earBased on this, the solution might be to deploy your EJBs in an ear file. Everything else looks OK. Can you try this and let us know?
Thanks,
Pete Farkas

WLS10 and Stateless Session Bean

I tried to create EJB3 application example.
1. Created Stateless Session Bean that implements Remote and Local interfaces:
Session Bean code:
package com.session;
import javax.ejb.Local;
import javax.ejb.Remote;
import javax.ejb.Stateless;
import javax.ejb.TransactionAttribute;
import javax.ejb.TransactionAttributeType;
@Stateless(mappedName="SessionBeanService")
@Remote(ISessionBeanRemote.class)
@Local(ISessionBeanLocal.class)
@TransactionAttribute(TransactionAttributeType.REQUIRED)
public class SessionBean implements ISessionBeanLocal,
ISessionBeanRemote
public String reply(){
return "MySessionBean - success !!!";
Remote Interface code :
package com.session;
public interface ISessionBeanRemote
public String reply();
Local Interface code:
package com.session;
public interface ISessionBeanLocal
public String reply();
application.xml:
<?xml version="1.0" encoding="UTF-8"?>
<application xmlns="http://java.sun.com/xml/ns/javaee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
          http://java.sun.com/xml/ns/javaee/application_5.xsd"
     version="5">
     <display-name>EJB3 Sample Application</display-name>
     <module>
     <ejb>beans.jar</ejb>
     </module>
</application>
weblogic-application.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE weblogic-application PUBLIC
     "-//BEA Systems, Inc.//DTD WebLogic Application 8.1.0//EN"
     "http://www.bea.com/ns/weblogic/90/weblogic-application.xsd">
<weblogic-application>
          <classloader-structure>
               <module-ref>
                    <module-uri>beans.jar</module-uri>
               </module-ref>
          </classloader-structure>
</weblogic-application>
2. I packaged classes into EAR file and deployed to WLS10.
I didn't include any weblogic specific XML descriptors besides weblogic-application.jar.
My client code lookes as follows:
public void test(){
Context context = getMyServerContext();
// THIS JNDI NAME I SEE ON MY SERVER JNDI TREE
String jndiName = "sessionbeansbeans_jarSessionBean_ISessionBeanRemote";
Object obj;
obj = context.lookup(jndiName);
System.out.println(" obj class : " + obj.getClass().getName());
ISessionBeanRemote remote = (ISessionBeanRemote) PortableRemoteObject.narrow(
obj, ISessionBeanRemote.class );
String res = remote.reply();
System.out.println("res : "+res);
I get an Exception:
Exception occurred!
java.lang.ClassCastException: Cannot narrow remote object to com.session.ISessionBeanRemote
     at weblogic.iiop.PortableRemoteObjectDelegateImpl.narrow(PortableRemoteObjectDelegateImpl.java:242)
     at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:137)
     at ca.cgi.mvest.test.server.wms.GlFacadeTest.runTest(GlFacadeTest.java:91)
     at ca.cgi.mvest.test.server.wms.GlFacadeTest.<init>(GlFacadeTest.java:53)
     at ca.cgi.mvest.test.server.wms.GlFacadeTest.main(GlFacadeTest.java:151)
java.lang.ClassCastException: Cannot narrow remote object to com.session.ISessionBeanRemote
My server console have the following output:
Root cause of ServletException.java.lang.NoClassDefFoundError: com/session/SessionBean_7pp7ls_ISessionBeanRemot
eIntf
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:12
4)
at weblogic.utils.classloaders.GenericClassLoader.defineClass(GenericCla
ssLoader.java:338)
at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(Generic
ClassLoader.java:291)
Truncated. see log file for complete stacktrace
Server logs a problem already on the line when I do lookup
on JNDI name even before narrow();
It looks like my EAR was missing something. But server never complained during deployment.
May be someone can direct me to a real sample of Weblogic10-ejb3.0 application, since examples that come with WLS 10 intallation combersome and do not follow
docmentation.
Thanks in advance for any suggestion.

Hello Freind
The main different b\w stateful and statless is that stateful maintain state of method conversation means it has record that which method call before this method
but in case of stateless conversation state does not saved second different we can say that create method in stateless having no parameter but statefull having parameter I think u can understand easily
With Best Regards
Rajesh Pandey
email :[email protected]
url :-- http://www.sixthquadrant.com
Mob :-- 9811903737
Delhi India

JCo 3.0 Server and Stateless Session Bean

Hello,
I use JCO (3.0) and I need to integrate SAP with JBoss.
The SAP Module is calling EJB-Services over JCo.
How would the architectur looks like?
I start with using an MBean to start and stob the native JCO-Server over JMX.
This still works.
But it doesn't work:
The Client(SAP) calls the JCoServer (works fine).
But the call off the EJB failed.
What solutions do you have to share?
Do you use a stateless session bean?
Best regards
Peter

The program ID should be with length 8 max

How to get stateful and stateless session bean in second jsp

I create stateful session bean in the first jsp, then how can I get the stateful session bean in the second jsp? I find that somebody store the bean in HttpSession.
If I store the stateful session bean in HttpSession, then I can get it in the second jsp. My problem is that I can store the stateless session bean in HttpSession, and get it in the second jsp. Then, both stateful and stateless can maintain the state in the second jsp. What is the difference between stateful and stateless session bean in this case ?
I understand the definition of stateful and stateless session bean, but I'm confuse how to use session bean. Can anyone provide sample jsp to show difference of stateful and stateless? How the stateful session bean can maintain the state for the client?

Greetings,
I create stateful session bean in the first jsp, then how can I get the stateful session bean in the
second jsp? I find that somebody store the bean in HttpSession.Which is the correct scope for sharing client-specific data when 'request' scope is insufficient.
If I store the stateful session bean in HttpSession, then I can get it in the second jsp. My problem is
that I can store the stateless session bean in HttpSession, and get it in the second jsp. Then, bothWhy is that a "problem"? Does your application not require the stateless bean to be shared? If so, then don't store the EJBObject reference in the session...
stateful and stateless can maintain the state in the second jsp. What is the difference betweenWhat do you mean by this exactly?..
stateful and stateless session bean in this case ?Statefulness of session beans is in regard to maintaining client state (er, in all cases). If your "stateless" bean is receiving information from the client (i.e. its caller) - either through a create method or a business method - and that information is available (retrievable from the bean) on subsequent method calls, then that bean is, in fact, stateful - regardless of how it is deployed.
I understand the definition of stateful and stateless session bean, but I'm confuse how to use
session bean.The correct question, it here seems, is "when" to use which type... Use a "stateful" bean when information about (from) the client (i.e. the caller) must be maintained across method calls of the bean. Use a "stateless" bean for general business methods that do not depend on "prior knowledge" of the client (i.e. the caller).
Can anyone provide sample jsp to show difference of stateful and stateless? How the statefulA "sample JSP" would yield nothing additional... The semantics of calling, using, and "persisting", bean references are always the same - regardless of type or class. However, the reason(s) for using one over the other depends entirely on the needs of your application.
session bean can maintain the state for the client?I recommend that you spend more time learning about EJBs generally. In particular, it seems you require more fundamental understanding of their scope and lifecycle. Refer to sections 4, 6, and 7 of the EJB 2.0 Specification.
Regards,
Tony "Vee Schade" Cook

Stateless session Bean - xml and ejb-jar.xml file ???

Dear Experts,
Stateless-session bean
For Creating an ear file
we need ejb-jar.xml and weblogic-ejb-jar.xml files
Is these files are already available
or we have to type these files ??
Advance Thanks
Rengaraj.R

My best advice: surrender to use an IDE.
You wonder sometimes at how much productivity (read as 'time') could be wasted by doing something that could be done automatically. For a learning experience or a once only exercise is fine but as a routine thing, not worth it.
Cheers

Stateless session beans and idle timeouts (weblogic 10.3.1)

Need clarification about stateless session beans and the idle-timeout-seconds setting.
Situation is this – we have a process that is timing out due to an API call to a very slow Authentication server.
I am trying to resolve this with a code change, but need to further other understand what the server is actually doing.
We have a session bean which calls another which is calling a util class that does all the work and returns the results back up to the initial session bean. I have left out the ejbName in these examples (it’s irrelevant here).
Example:
SessionBean1 // basically called just once a day
@Session(defaultTransaction = Constants.TransactionAttribute.SUPPORTS,
enableCallByReference = Constants.Bool.TRUE,
type = Session.SessionType.STATELESS,
transTimeoutSeconds = "0",
initialBeansInFreePool = "0",
maxBeansInFreePool = "20")
Methods
@RemoteMethod() public boolean getUserList(String adminGroup) {
Map usrList = getUserList(adminGroup);
Private Map getUserList(String adminGroup) {
     return SessionBean2.getUsers(adminGroup);
SessonBean2
@Session(defaultTransaction = Constants.TransactionAttribute.SUPPORTS,
enableCallByReference = Constants.Bool.TRUE,
type = Session.SessionType.STATELESS,
transTimeoutSeconds = "0",
initialBeansInFreePool = "3",
maxBeansInFreePool = "20")
Method
@RemoteMethod() public Map getUsers(String adminGroup) throws RemoteException {
return javaUtilClass.getUsers(adminGroup);
JavaUtilClass
Method
public Map getUsers(String adminGroup) throws RemoteException {
     // This is where the work happens, calling the Authentication server to get a complete
     // list of users for an admin group. When the user list is around 1500 entries, this can
     // take an hour. Did I mention this server is very slow? It’s about this threshold of 1500
     // that causes the timeout.
     return Map of users
First thought, just bump the idle-timeout-seconds setting for the session beans (from the default 600), but that would be a temporary solution until the user list grew larger.
Second thought, refactor the call to the Authentication Server API to get the user list in blocks of data (say 400 at a time) and decreasing the call/response time between the method getUsers and the API call. This would still occur in the JavaUtilClass, so I am unsure this would make a difference. The session beans would still be idle and subject to timeout, correct?
Would setting initialBeansInFreePool to 1 in SessionBean1 make any difference?
Or should I be looking at replicating the re-factored method from the JavaUtilClass in SessionBean1 where the user list is being used so that the API calls come back to it and keep it 'active'?
Thanks for any advice you could give me on this.

Hi
regarding timeouts, there are two ways:
1.- Changing the settings in the JTA WebLogic domain , called "Timeout Seconds". This will affect globally to all EJB deployed in the domain.
or
2.- Specified directly in the bean with a weblogic annotation, like this:
@TransactionTimeoutSeconds(value = 300)I hope this will help you.
Regards.
Felipe

Difference between stateful and stateless session beans

can any body explain simply what is the difference between stateful and stateless session beans? also in what kind of situations we can use these.

Hi
This is the classificatio os Session Bean.
(1) Statfull
(2) Stateless
Stateful means u will persists the state of the object.
USESE:
In a Banking system u can use the statful session just for maintaing the
state.
(2) STATELESS: that's mean u do't want to persists any state of the object. that's mean a single Request is coming ,do the desire and give the output.
EX: A Credit Card System is the Example of Stateless.
May it will helpfull to understands u. if any need write here
saM

Call stateless session bean EJB 2.0 from Webdynpro Java UI

Hello,
Can someone please tell me asto how to call a stateless session bean EJB 2.0 from Webdynpro Java UI?
The NWDS version is 7.0.
Thanks and Regards,
Arya

Hi Aryadipta
Please check this pdfs
https://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/b00917dc-ead4-2910-3ebb-b0a63e49ef10&overridelayout=true
Steps for calling stateless session bean in Webdynpro java
Go to NWDS -> open perspective ->j2ee
select EJB Module Project ->create a project with name
Open the Project -->RC on ejb-jar.xml -> Select new --> EJB
Give name to EJB Bean (First letter should be in capital letters)
select the type of bean as Stateless session bean and give the package name to store that EJB bean.
After that Expand ejb-jar.xml and then select the <projectEJB>
Double click on this on method tab double click you will get business method where we will create the methods for business logic
Double click on projectEJB and then RC on bean tab and write required business logic in bean window as follows(based on requirement we will design a business logic).
After writing the business logic go to project -> rebuild
Till now we have created one EJB jar file
then go to File-->Enterprise Application Project -->create a project (projectEAR)
After creating a project click on next-> here we will have ear projects and then we select specific project required for our application.(here select projectEJB)
After that Calculate EAR project will be available on j2ee explorer.
Right click on <Bean> here
select New->Web Service->give a name to webservice and select Default configuration type as simple SOAP
-->click next -> Finish.
That webservice and related are created in ejb-jar.xml .
Expand the ejb-jar.xml.and double click on < webservice>
RC ProjectEJB -> Build EJB Archive RC on CalculateEAR ->Build applicationarchive.
Expand the projectEAR->RC on CalculateEAR.ear->Deploy to J2EE Engine
Double click on calculateEAR.ear ->Webservice navigator tab ->we eill servers expand the node
select the specific WebService
Here we test the webservice by click on Test and test it.
After that go to Web dynpro perspective ->create one webdynpro Project and one component
RC on model> Select import Web Service model(last)>give model name and package
and select radio button as local file system or URL
Go to WSnavigator->copy the WSDL path and paste it in model WSDL path and click on finish.
from here onwards steps are same as that adaptive RFC model
Hope it helps
Thanks
Tulasi Palnati
Edited by: Tulasi Palnati on Aug 26, 2009 12:15 PM
Edited by: Tulasi Palnati on Aug 26, 2009 12:43 PM

Newbie: How do i use a stateless session bean in a backing bean?

I have a stateless session bean with a function 'getVoterList()'; how do i instantiate the bean and use it in from my managed bean?
I dont want to use seam; coz the stateless serrion bean/EJB is written by another developer and we cant updat eit now to use seam..
any tutorials? walk thrus or sample code?
thanks
illi

I used a different method...
I used servicegen with only a.jar to create the ear.
I touch-ed my own application.xml to make it newer than the one already in the
newly created ear.
I used the ant <ear> task to add b.jar, c.jar, and application.xml to the ear.
Worked like a charm.
Mike
Bruce Stephens <[email protected]> wrote:
Hello,
See if Neal's answer here helps solve your problem using servicegen's
service element "IncludeEJBs" attribute:
http://newsgroups.bea.com/cgi-bin/dnewsweb?cmd=article&group=weblogic.developer.interest.webservices&item=2932&utag=
HTHs,
Bruce
kk wrote:
This is my situation.
I have an .ear file and in that i have several other .jar files whichare
inter-dependant, lets say
A.jar
B.jar
C.jar files
and i want to expose only A.jar as
webservice, how can i do that ?
Does WLS8.1 provided any way how to do that?
I Appreciate any suggestions and advices.
Thanks
kk

It's a WebService and a Stateless Session bean

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