Stateless Session Bean calling another Stateless Session Bean

Hi all,
I have written 2 Stateless Session bean and would like to call the business method of 2nd Stateless Session Bean in the business method of the 1st.
I have written the lookup code for 2nd SB in the business method of 1st SB and would like to execute the business method in the same method itself.
What do I have to do for the same for the following :
Deployment Descriptor file or any other file needs to be modified.
I am using Weblogic 6.1 and SQL Server 7.0 as database.
Thanks in advance,
Seetesh

This is actually quite similar to calling a session bean from anywhere.
Try this
//Session Bean 2 - Business Method, JNDI name SessionBean2
public void doSomethingMore(String what)
// Session Bean 1 which call.
public void doSomething()
   InitialContext initCtx = new InitialContext();
   SessionBean2Home home2 = null;
   SessionBean2 bean2 = null;
   try
     home2 = (SessionBean2Home)initCtx.lookup("SessionBean2");
     bean2 = home2.create();
   }catch(FinderException ex){..}
    catch(CreateExceptrion ex){..}
   try
     bean2.doSomethingMore("Anything");
   }catch(remoteException ex){..}
}In my case (webLogic 5.1) I did not need to change anything in any of the deployment descriptor. However, both beans needs top be deployed on same instance of Application server (might work across instances but didnt try)
This should do it.
Amitabh

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         java.io.NotSerializableException: DefaultSession_RemoteProxy_6nein01".
    [b/                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

    Your remote client passes a DefaultSession to AdminSession.initialize(..). This DefaultSession has to be a remote type. In your client, how does it get DefaultSession?
    Did your client look up DefaultSession, and have it return a (sessionContext.getBusinessObject(DefaultSession.class))? If so, it should work.

  • Using a CMP Entity Bean local stub as a field of another CMP Entity Bean

    Hello,
    Is it possible to implement a field of a CMP Entity bean as another CMP Entity bean and how is it done?
    I've seen a pseudo code for this in Ed Roman's Mastering EJBs, second edition, but I can't seem to get it to work (pages: 330 - 1:1 using CMP and 339 - fake M:N using CMP).
    I'm using SUN ONE Application Sever 7. Is this server capable of this?
    I'm trying to implement a fake M:N relationship using 3 beans: 2 for each side of the relationship and one as the "bridge" table.
    For example, the two beans on each side of the relationship are SubscriberBean, SubscriptionBean and the "bridge: bean is SubscriberSubscriptionBean. The SubscriberSubscriptionBean has two fields: SubscriberLocal stub and SubscriptionLocal stub.
    Please let me know if you need more information to answer this question.
    Thanks.
    Nikola

    Im sorry but i dont know about the example you are talking about. I kinda learn
    all those techniques from forums, articles and tutorials because book often suffer from
    not having the information im mostly looking for.
    As far as i understand you, you want to implement a bridge been, which is representing a row in a join table. So that if one side of the relation is deleted the join-table entry (your bridge-CMP-Bean) is cascaded. Right?
    First of all the simple part: (My approach)
    - The joint table is foreign keys only - without a relation description. -
    In this case you dont have to implement a bridge bean. Because it just wouldnt represent anything of sense.
    Lets think of an entity/table USER whith the columns name (PRIMARY KEY), and prename.
    Our second entity/table is ADDRESS with the columns road (PRIMARY KEY) and housenr.
    The join table is simply: USER_ADDRESS with fk_name (FOREIGN KEY) and fk_road (FOREIGN KEY) both on CASCADE DELETE. So if the address is deleted the mapping entry is deleted, too same for the user part:
    USER -> USER_ADDRESS <- ADDRESS.
    Our entity Beans are called User and Address in class-names JNDI-names and names.
    Now we want to create the CMR mapping so we can access the addresses of a user from the user bean directly. The methods on the user side are:
    public abstract Collection getAddresses();
    and
    public abstract void setAddresses(Collection new_addresses);
    the xdoclet comments on the User side are (for the getter only)
    * @ejb.interface-method
    * @ejb.relation
    *                name = "User-has-Addresses"
    *                role-name = "User-Addresses"
    *                target-ejb = "Address"
    *                target-multiple = "true"
    * @sunone.relation
    *                column="USER_ADDRESS.fk_name"               
    *                target="USER_ADDRESS.fk_road"               
    public abstract Collection getAddresses();
    for the other side of the relation we define in the Address-Entity
    public abstract Collection getUsers();
    and
    public void setUsers(Collection users);
    the xdoclet comments on the Address side are (for the getter only)
    * @ejb.interface-method
    * @ejb.relation
    *                name = "User-has-Addresses"
    *                role-name = "Address-User"
    *                target-ejb = "User"
    *                target-multiple = "true"
    * @sunone.relation
    *                target="USER_ADDRESS.fk_road"               
    *                column="USER_ADDRESS.fk_name"
    As we dont want the user or address to be deleted if the other side of the relation is deleted we dont specify cascade-delete="yes" in the ejb.relation namespace.
    The sun-cmp-mappings.xml should now look like this:
    (For the User - side)
    <!-- Relationship User-has-Addresses, role User-Addresses -->
    <cmr-field-mapping>
    <cmr-field-name>addresses</cmr-field-name>
    <column-pair>
    <column-name>USER_ADDRESS.fk_name</column-name>
    <column-name>USER_ADDRESS.fk_road</column-name>
    </column-pair>
    </cmr-field-mapping>
    and similar on the Address-Side:
    <cmr-field-mapping>
    <cmr-field-name>users</cmr-field-name>
    <column-pair>
    <column-name>USER_ADDRESS.fk_road</column-name>
    <column-name>USER_ADDRESS.fk_name>/column-name>
    </column-pair>
    </cmr-field-mapping>
    Dont forget that all elements in the Collection must be of the right Interface-type.
    First of all the harder part:
    Now what you might want is when the relation has some information specified like user live at address and is tenant or facility manager.
    The, in the first step you will have to implement the UserAddressRelation entity which will have to CMR fields of the 1:N type.(Just as you wish)
    Lets think of the example above extended by the relation type. Our relation bean is named UserAddressRelation.
    Now User has the methods as above but the classes in the Collection must now be of the UserAddressRelationLocal/Remote interface and not AddressLocal/Remote-interface.
    You will have to change the xdoclet comment to:
    * @ejb.interface-method
    * @ejb.relation
    *                name = "User-has-Addresses"
    *                role-name = "User-Address"
    *                target-ejb = "UserAddressRelation"
    *                target-multiple = "true"
    * @sunone.relation
    *                target="USER_ADDRESS.fk_name"               
    *                column="USER.name"
    So we now dont reference the other side bean directly. We reference the relation EntityBean. Do the similar changes on the other side.
    In particular you will have to specify 4 CMR mappings now:
    1. User to UserAddressRelation 1:N
    2. UserAddressRelation N:1
    3. Address to UserAddressRelation 1:N
    4. UserAddressRelation N:1
    Which i dont want to explain in detail now because its kinda all the same as above.
    Now you cann access the Addresses of a user in the way.
    UserLocal.getAddresses(); <- !you get the mappings!
    UserLocal.getAddresses().item(0).getAddress() <- you get the address (this is dirty coding just for understanding)
    UserLocal.getAddresses().item(0).getUserRole() <. you get the role of the user at this address.
    Hope this helped you. You are welcome to ask any detailed question.

  • Problem while invoking a Stateless Session bean from another bean

    Hi,
    I have a peculiar problem while coding with Stateless Session beans. Maybe you guys can help me out over here. The scenario is as follows
    There are 3 Stateless Session beans. Let Us say Bean A, B and C. There are three methods, method1, method2, and method3 inside A, B and C respectively.
    From A.method1(), B.method2(), and C.method3() are being invoked sequentially. Each of these methods does some JDBC operation and then returns.
    The problem is this, if C.method3() throws and exception, then I am unable to rollback the changes made by B.method2(). Those changes get "Committed" to the database.
    All the 3 beans have Bean managed persistence property set. I am using WebSphere 6.1.
    Any insight on why this is happening would be greatly appreciated.
    Thanks In Advance
    Amardeep Verma

    Hi,
    This is a matter of calling all three methods in the same transaction context. Most easy way of doing this is having a 4th session bean containing a method calling the other 3. Make sure that the Transaction Attributes are REQUIRED, which is the default.
    If the calls a to different backends/databases, you need global transactions and therefor XA complient database and drivers.
    HTH Robert

  • Y is Stateless Session Bean is of type Session Bean?

    Hi all!
    Statless Session Bean...It not maintaining a state ...then y its of type Session Bean?

    Because it's not an Entity Bean, or a Message-Driven Bean, or even a Timer Bean. ;-)
    I usually refer to Stateless Session Beans as "Stateless Beans" and to "Stateful Session Beans" as "Stateful Beans" although Entity Beans are also "Stateful" and Message-Driven Beans could be considered as "Stateless". It's just a simplification of language.

  • Calling a session bean from another bean

    Hi,
    Using weblogic server 6.1, I am trying to call a session bean, B, from a session bean A.
    After importing B's package, I have added the following code to A's implementation:
    try {
    Properties h = new Properties(); h.putContext.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory");
    h.put(Context.PROVIDER_URL, "t3://localhost:7001" );
    Context ctx = new InitialContext(h);
    Object tempHome = ctx.lookup(JNDI Name of B);
    BHome home;
    home = (BHome)javax.rmi.PortableRemoteObject.narrow(tempHome, BHome.class);
    catch(Exception e){...}
    I can compile the code successfully but when I run it,I get an error saying:"java.lang.NoClassDefFoundError: B.BHome"
    Can someone please tell me where I am going wrong?
    Thanks in advance,
    Fauzia

    I haven't used that web server but I have had the same kind of problem with ours.
    My guess is that you are compiling this in an environment where the home class is in the classpath. When you run it, though, this class cannot be resolved. Usually we have this problem when the class that is trying to get the bean is unable to find the remote jar.

  • Local session bean lookup in another local session bean in EJB 3.0

    Hi,
    I am doing JNDI lookup of a local session bean in a session bean. ( I do not want to use EJB dependency injection).
    Lookup of local interface from session bean is successful. But, when the calling session bean is a local session in another session bean, the lookup fails.
    Here is an example:
    @Stateless
    @EJBs({@EJB(name="EJB2Local", beanInterface=EJB2Local.class),
    @EJB(name="EJB3Local", beanInterface=EJB3Local.class)})
    public class EJB1 implements EJB1Remote, EJB1Local{
    public void findEJB3Local(){
    //1. JNDI lookup for EJB3Local ----
    //2. EJB3Local.someFunction()
    @Stateless
    @EJB(name="EJB1Local", beanInterface=EJB1Local.class)
    public class EJB2 implements EJB2Remote, EJB2Local{
    public void findEJB1Local(){
    //1. JNDI lookup EJB1Local
    // 2. Call EJB1Local.findEJB1Local method
    //THIS METHOD CALL WILL FAIL.
    public void findEJB1Remote(){
    //1. JNDI lookup EJB1
    / 2. Call EJB1Local.findEJB1 method
    @Stateless
    public class EJB3 implements EJB3Remote, EJB3Local{
    public void someFunction(){}
    This setup was working in EJB 2.1, as we had clear ejb-local-ref definitions in our ejb-jar.xml file.
    I am suspecting that EJB 3.0 has special annotation to use when lookup is made from another local session bean.
    Any comments will be appreciated.
    Thanks,
    Mohan

    From a private component environment perspective, declaring @EJB in a bean class is equivalent
    to using ejb-ref or ejb-local-ref for that same bean in ejb-jar.xml. In each case, the EJB dependency
    is declared for that bean. Each EJB component has its own private component environment, so
    code running within invocations on different EJBs can not see the component environment of the
    components that made the invocations.
    What exact error are you getting? Please post the stack trace if possible.
    --ken                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

  • How to use a session bean in another session bean (or an EJB in a session)

    JDev 11.1.1.4, WLS 10.3.4, Windows 7 x64
    I have a login controller with a session-scoped bean that manages logins.
    I have another session-scoped bean that manages menu security.
    both modules compile and work fine now I need to share the data from one to another.
    I need to reference the login controller in the menu security bean. How do I reference (include) the login bean in the security bean?
    I tried an EJB - what a farce - these are supposed to be universal and easy ( basis of the oop in Java).
    the bean is defined:
    @Stateless(name = "SecurityEJB", mappedName = "ZITASApplication-ZITASModel-SecurityEJB")
    I have tried :
    ic = new InitialContext();
    session = (SecurityEJBLocal)ic.lookup("ZITASApplication-ZITASModel-SecurityEJB#model.security.logic.SecurityEJB");
    session = (SecurityEJBLocal)ic.lookup("ZITASApplication-ZITASModel-SecurityEJB#model.security.logic.SecurityEJBLocal");
    session = (SecurityEJBLocal)ic.lookup("java:ejb/model.security.logic.SecurityEJB");
    session = (SecurityEJBLocal)ic.lookup("java:ejb/SecurityEJB");
    session = (SecurityEJBLocal)ic.lookup("java:app/SecurityEJB");
    session = (SecurityEJBLocal)ic.lookup("java:module/SecurityEJB");
    All return null pointers and claim the name cannot be resolved.
    As you can see - I have found various claims to how to do this.
    One way says create a sevlet, generate a listener and use the sevlet. Basically one for every EJB - a lot of work to use the EJBs
    I would assume that this would be one of the easiest parts of java - as it is the foundation of re-usability and oop.
    I can do either in the application - the added complexity of the EJB is less desirable - but better programming?

    Hi,
    ic.lookup("ZITASApplication-ZITASModel-SecurityEJB#model.security.logic.SecurityEJB");This should work with remote interface. If you want to lookup local interface, you need to register it in web.xml. Quote:
    To access the business local interface you need to define ejb local references for your component environment (i.e. from your servlet environment). You can do this by defining references in your web.xml. For example:
    <ejb-local-ref>
    <ejb-ref-name>ejb/BusinessLogicBean</ejb-ref-name>
    <local>packagename.BusinessLogicBean</local>
    </ejb-local-ref>
    To lookup your local reference from your servlet you need to use the following JNDI reference:
    java:comp/env/ejb/BusinessLogicBean Another one
    First, declare a local ejb reference in your web.xml file (This will add it to JNDI):
    <ejb-local-ref>
    <ejb-ref-name>ejb/Foo</ejb-ref-name>
    <local>simple.ejb.FooLocal</local>
    </ejb-local-ref>
    Then it can be looked up from JNDI:
    InitialContext ctx = new InitialContext();
    FooLocal foo = ctx.lookup("java:comp/env/ejb/Foo");Hope this helps.
    Pedja
    Helpful links (judging from your first post, you are probably sick of these :) )
    How to lookup local EJB in Oracle Weblogic 10.3
    http://m-button.blogspot.com/2008/07/reminder-on-how-to-use-ejb3-with.html
    http://www.coderanch.com/t/451012/EJB-JEE/java/EJB-Local-Lookup-not-working

  • Local Session Bean Call Exception in App Server

    I have been having trouble calling a Local Session bean in Glassfish.
    I set up an example to show the exception I am having:
    MainBeanLocal
        package com.test;
        import javax.ejb.Local;
        @Local
        public interface MainBeanLocal {
             void testCall();
    MainBean:
        package com.test;
        import javax.ejb.Stateless;
         * Session Bean implementation class MainBean
        @Stateless(mappedName = "ejb/MainBean")
        public class MainBean implements MainBeanLocal {
             @Override
             public void testCall() {
                  System.out.println("Test Call Succeeded");
    RemoteBeanRemote:
        package com.test;
        import javax.ejb.Remote;
        @Remote
        public interface RemoteBeanRemote {
             public void callMainBean();
    RemoteBean:
        package com.test;
        import javax.ejb.Stateless;
        import javax.naming.InitialContext;
        import javax.naming.NamingException;
         * Session Bean implementation class RemoteBean
        @Stateless(mappedName = "ejb/RemoteBean")
        public class RemoteBean implements RemoteBeanRemote {
             @Override
             public void callMainBean() {
                  try {
                       InitialContext ctx = new InitialContext();
                       MainBeanLocal mb = (MainBeanLocal) ctx.lookup("ejb/MainBean");
                       mb.testCall();
                  } catch (NamingException e) {
                       // TODO Auto-generated catch block
                       e.printStackTrace();
    Test Code:
        package com.test;
        import javax.naming.InitialContext;
        import javax.naming.NamingException;
        public class BeanTester {
             public static void main(String[] args){
                  try {
                       InitialContext ctx = new InitialContext();
                       RemoteBeanRemote remote = (RemoteBeanRemote) ctx.lookup("ejb/RemoteBean");
                       remote.callMainBean();
                  } catch (NamingException e) {
                       // TODO Auto-generated catch block
                       e.printStackTrace();
    Output Trace:
        INFO: deployed with moduleid = TestEJB
        INFO: **RemoteBusinessJndiName: ejb/RemoteBean; remoteBusIntf: com.test.RemoteBeanRemote
        INFO: LDR5010: All ejb(s) of [TestEJB] loaded successfully!
        WARNING: javax.naming.NameNotFoundException: MainBean not found
             at com.sun.enterprise.naming.TransientContext.doLookup(TransientContext.java:216)
             at com.sun.enterprise.naming.TransientContext.lookup(TransientContext.java:188)
             at com.sun.enterprise.naming.SerialContextProviderImpl.lookup(SerialContextProviderImpl.java:74)
             at com.sun.enterprise.naming.LocalSerialContextProviderImpl.lookup(LocalSerialContextProviderImpl.java:111)
             at com.sun.enterprise.naming.SerialContext.lookup(SerialContext.java:409)
             at javax.naming.InitialContext.lookup(InitialContext.java:392)
             at com.test.RemoteBean.callMainBean(RemoteBean.java:19)
             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:597)
             at com.sun.enterprise.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1011)
             at com.sun.enterprise.security.SecurityUtil.invoke(SecurityUtil.java:175)
             at com.sun.ejb.containers.BaseContainer.invokeTargetBeanMethod(BaseContainer.java:2920)
             at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:4011)
             at com.sun.ejb.containers.EJBObjectInvocationHandler.invoke(EJBObjectInvocationHandler.java:203)
             at com.sun.ejb.containers.EJBObjectInvocationHandlerDelegate.invoke(EJBObjectInvocationHandlerDelegate.java:117)
             at $Proxy71.callMainBean(Unknown Source)
    ...What am I doing wrong when calling **MainBeanLocal**? I would like to avoid dependency injection, as if the MainBeanLocal was being called from a POJO.
    Note: I have no trouble calling the RemoteBean.. I want to be able to call the local bean from the remote bean.

    Maik,
    If this is still a problem, could you please post the descriptors from the EAR?
    Are you using any annotations?
    - Tim

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