Business interface class count (EjbObject)

Hi,
Can Ejb have more than just one EjbHome based class (business interface)
Thanks,

You mean you have two component interfaces "InterfaceA" and "InterfaceB" and you want one ejb to implement both of them? Yeah, just created a third interface that extends both InterfaceA and InterfaceB and use that for your interface.
cheers
dim

Similar Messages

Implement an business interface in a bean

Is it true that when specifing a number of business interfaces for a bean class with an annotation (@Remote) it not require that the bean class implement the interfaces ??
it sounds weird to me..
if it is possible , then where is the implementation of the interfaces?
thanks in advanced.

If your bean doesn't implement the business interface, you'll need to use annotations (@Remote on the session bean class) or the deployment descriptor to let the container know what the business interfaces are used by the session bean.
For example,
// BusinessIF1.java
package myejbs;
public interface BusinessIF1 { public void doSomething(); }
// BusinessIF2.java
package myejbs;
public interface BusinessIF2 { public void doSomethingElse{}; }
// MySessionBean.java
package myejbs;
@Remote({BusinessIF1.class, BusinessIF2.class})
@Stateless
public class MySessionBean {
public void doSomething();
public void doSomethingElse();
}This isn't recommended, though. You'll lose a compile-time check to make sure that all of your business methods are implemented. You can catch this if you use Sun's verifier tool, though.

EJB3 Stateful Sessionbean how to implement multi business interfaces?

Hi All,
I met up some issue, can't make the session bean implement 2 business interfaces? Please kindly throw me some light! thanks
Business sessionbean
@Stateful
@ConversationScoped
@Named
@Local( { IWizard.class, IRegisterWizard.class })
public class RegisterWizard extends WizardBean {
@Local
public interface IWizard extends Serializable {
        public String back();
        public boolean hasBack();
        public boolean hasNext();
        public String next();
        public String abort();
@Local
public interface IRegisterWizard{
        public String submit();
}error message of glassfish3 below:
Caused by: java.lang.IllegalArgumentException: Not enough type information to resolve ejb for ejb name class wizard.RegisterWizard
        at org.glassfish.weld.services.EjbServicesImpl.resolveEjb(EjbServicesImpl.java:121)
        at org.jboss.weld.bean.SessionBean.createReference(SessionBean.java:422)
        at org.jboss.weld.bean.proxy.EnterpriseBeanProxyMethodHandler.<init>(EnterpriseBeanProxyMethodHandler.java:76)
        at org.jboss.weld.bean.SessionBean.create(SessionBean.java:298)
        ... 53 more

There does appear to be a bug in the handling of the bean with multiple business interfaces. I filed an issue for it :
https://glassfish.dev.java.net/issues/show_bug.cgi?id=11826. The inheritance is a separate issue. Are you getting the same error or a different one after applying @LocalBean.

How do I use a variable from an Interface class?

Right now I have three classes. First class is called Game and it extends my second class call Parent and also implements my third class call Source. Source is an interface class. I have a variable that I want to use in my Source class named Checker. Now, How do I go among using that variable from my Game class? What should the code look like?
ex.
public class Game extends Parent implements Source
need help badly....

ok, what I forgot to tell you guys is that my variable
in my interface class is a boolean type(true or
false). It is set to true now. But I want it to change
to false when a user triggers a button in the Game
class. How do I do this? You don't because you can't. If you have a varaible declared in an interface it must be static and final. It cannot, therefore, be changed. Better head back to the drawing board.

How do i hide a column in table interface class

Hi,
I need to hide a column in Abap table interface class. When i tried to hide from web item properties it didn't work so i am thinking to hide first column in the table interface class
Thanks,
mala

In the WebApplication Designer start Tools -> View Definition -> Based on a Query. Choose your query, change layout to your requirements and save the view. Now just use the view in your webtemplate.
Pls assign points if answer is useful
<a href="https://www.sdn.sap.comhttp://www.sdn.sap.comhttp://www.sdn.sap.com/irj/sdn/weblogs?blog=/pub/u/37289">vitaliy</a>

EJB:What is a Business Interface ?

Hello,
I am using netbeans 5.5 and creating a stateless bean.
I have the following files in my enterprise application:
ConverterBean.java: This is my Bean.
ConverterRemote.java: This is my Remote Interface.
ConverterRemoteBusiness.java: Business Interface ??? .. never heard of it before..Netbeans created this one automatically.
ConverterRemoteHome.java: This is my Home Interface.
Help me out ..here.

newark wrote:
[http://java.sun.com/javaee/5/docs/tutorial/doc/bnbnc.html]
Search that page for business interfaceSuppose we have MulletBean. Its business in the front, party in the back. But hows does the EJB architecture capture this?

How to directly call business object class from backing bean class

I woul like to call business object class directly from the backing bean class and implement methods in BO. If possible can anyone give an example code.
Thanks in advance

Which problems are you occurring then? I really don't see problems. You're just free to access and invoke them.

Understanding the use of interface class?

Hello,
This question referes to java servlets, but the questions is about java design.
My wrox java server pages text, includes an example where some user data is posted to servlet.
To process the data posted and store this, they created a interface class and another class AdminManager which implements the interface.
In the servlet they create an object from the interface class, and call the AdminManager methods through the interface object.
In the book this was the only example which used a interface. And I wondered if this design approach was often used, or should an interface normally be used if several classes would implement the interface.
Thanks

It depends. You might want to create an interface even if you only have a single implementation of that interface in mind, because you want to make it easy to create more implemenations later.
Also keep in mind that not all implementations of an interface are strictly for production use. For example, you might want to define an interface, define an implementation of that interface for production use, but then also define a "mock" version of that interface for testing, prototyping, etc.
Generally I feel that if you have a sufficiently complex set of types and relationships between those types, it makes a lot of sense to express those relationships purely as interfaces, on a high level. Then provide implemenations as a separate step in the programming process.

Bean problem: No interface classes found

Hi ;
I try to create a adapter . according to tutorial "How To Create Modules for the J2EE Adapter Engine"
https://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/f013e82c-e56e-2910-c3ae-c602a67b918e&overridelayout=true
Although I did all steps in it , I copied sda files and extract them then I imported them to the project but I get this error in Netweaver Studio "Bean problem: No interface classes found" while creating ejb file.
the document says you must close and reopen project when you come accross this error but it doesnt work?
Is there any one solve this error?
ps: I use NWDS 7.0.19 , I copied aii_af_lib.sda, aii_af_svc.sda and aii_af_cpa_svc.sda files from PI 7.01

Hi Tuncer!
Did you download and "import" these JAR files into your NWDS Build Path - classpath variables:
com.sap.aii.af.lib.mod.jar     <bin>/ext/com.sap.aii.af.lib/lib
sap.comtcloggingjavaimpl.jar     <bin>/system
com.sap.aii.af.svc_api.jar     <bin>/services/com.sap.aii.af.svc/lib
com.sap.aii.af.cpa.svc_api.jar     <bin>/services/com.sap.aii.af.cpa.svc/lib
com.sap.aii.af.ms.ifc_api.jar     <bin>/interfaces/com.sap.aii.af.ms.ifc/lib
<bin> stands for: /usr/sap/<SID>/<instance-id>/j2ee/cluster/bin in a PI 7.1 system.
Windows -> Preferences -> Build Path -> Classpath Variables -> New ...
Choose a name of your choice and then select the JAR files mentioned above.
This should resolve your problem.
Regards,
Volker

RE: Hide a column in web report using table interface class

Hi,
I want to hide first column in web template using table interface class. Following is the code i used in CAPTION_CELL and CHARACTERISTIC_CELL. Is this correct?
method CAPTION_CELL.
*First column
if i_x = 1.
add comment tag
move ' '
C_CELL_CONTENT
into C_CELL_CONTENT.
endif.
endmethod.
method CHARACTERISTIC_CELL .
*CALL METHOD SUPER->CHARACTERISTIC_CELL
EXPORTING
I_X =
I_Y =
I_IOBJNM =
I_AXIS =
I_CHAVL_EXT =
I_CHAVL =
I_NODE_IOBJNM =
I_TEXT =
I_HRY_ACTIVE =
I_DRILLSTATE =
I_DISPLAY_LEVEL =
I_USE_TEXT =
I_IS_SUM =
I_IS_REPETITION =
I_FIRST_CELL = RS_C_FALSE
I_LAST_CELL = RS_C_FALSE
I_CELLSPAN =
I_CELLSPAN_ORT =
CHANGING
C_CELL_ID =
C_CELL_CONTENT =
C_CELL_STYLE =
C_CELL_TD_EXTEND =
First column
if i_x = 1.
save document-item number
move I_CHAVL_EXT to l_docitem.
add comment tag
move ' '
C_CELL_CONTENT
l_docitem
into C_CELL_CONTENT
separated by space.
endif.
endmethod.
Activate the methods/class and add this in the Web Template!
for example:
<param name="MODIFY_CLASS" value="ZHCOLAPP">
ZHCOLAPP is the table interface class in this case.
Best,
Michael

Syntax error on keyword "void"; "interface", "class" expected

When migrating my application for Visual-Age to Web-Sphere 5.1
The following error occurred:
Syntax error on keyword "void"; "interface", "class" expected
for the code:
* ejbLoad method comment
* @exception javax.ejb.EJBException The exception description.
public void ejbLoad() throws javax.ejb.EJBException{
_initLinks();
}Thanking you in an advance

I had missed a closing breacket '}'

Default Table Interface Class - 0TPL_BAP_MASTER

Hi there
We are trying to determine which table interface class is used on the default 0TPL_BAP_MASTER web template.
We have created our own web template, but one of the pieces of functionality delivered with the standard template is the sort (ascending/descending) functionality which is included as arrows on the table column headings. We would very much like to use this on our custom template, and believe it to be implemented in the table interface class, but are not sure what that class is.
Anybody know the name of the class?
Cheers,
Andrew

Hi Deepu,
How are you?
I got a error about 0TPL_BAP_MASTER, when we are exicuting webtemplates in my portal. Can you please tell me what may be the error and how to overcome with this error.
Thanks,
Surendra.

No business interface, component interface or web service endpoint interface found for Session Bean SessionEJB

hi ,
i am just using EJb in my Application
just created an SessionBean and with Local interface in it i am getting this wierd exception with weblogic NetBeans and eclipse also
weblogic.ejb.container.compliance.ComplianceException: No business interface, component interface or web service endpoint interface found for Session Bean SessionEJB
weblogic.ejb.container.compliance.ComplianceException: No business interface, component interface or web service endpoint interface found for Session Bean SessionEJB
    at weblogic.ejb.container.compliance.SessionBeanClassChecker.checkInterfacesExist(SessionBeanClassChecker.java:177)
    at weblogic.ejb.container.compliance.Ejb30SessionBeanClassChecker.checkInterfacesExist(Ejb30SessionBeanClassChecker.java:27)
    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 weblogic.ejb.container.compliance.EJBComplianceChecker.check(EJBComplianceChecker.java:331)
    at weblogic.ejb.container.compliance.EJBComplianceChecker.checkDeploymentInfo(EJBComplianceChecker.java:280)
    at weblogic.ejb.container.ejbc.EJBCompiler.checkCompliance(EJBCompiler.java:789)
    at weblogic.ejb.container.ejbc.EJBCompiler.doCompile(EJBCompiler.java:222)
    at weblogic.ejb.container.ejbc.EJBCompiler.compileEJB(EJBCompiler.java:461)
    at weblogic.ejb.container.ejbc.EJBCompiler.compileEJB(EJBCompiler.java:428)
    at weblogic.ejb.container.deployer.EJBDeployer.runEJBC(EJBDeployer.java:437)
    at weblogic.ejb.container.deployer.EJBDeployer.compileJar(EJBDeployer.java:795)
    at weblogic.ejb.container.deployer.EJBDeployer.compileIfNecessary(EJBDeployer.java:683)
    at weblogic.ejb.container.deployer.EJBDeployer.prepare(EJBDeployer.java:1254)
    at weblogic.ejb.container.deployer.EJBModule.prepare(EJBModule.java:442)
    at weblogic.application.internal.flow.ModuleListenerInvoker.prepare(ModuleListenerInvoker.java:199)
    at weblogic.application.internal.flow.DeploymentCallbackFlow$1.next(DeploymentCallbackFlow.java:517)
    at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:52)
    at weblogic.application.internal.flow.DeploymentCallbackFlow.prepare(DeploymentCallbackFlow.java:159)
    at weblogic.application.internal.flow.DeploymentCallbackFlow.prepare(DeploymentCallbackFlow.java:45)
    at weblogic.application.internal.BaseDeployment$1.next(BaseDeployment.java:613)
    at weblogic.application.utils.StateMachineDriver.nextState(StateMachineDriver.java:52)
    at weblogic.application.internal.BaseDeployment.prepare(BaseDeployment.java:184)
    at weblogic.application.internal.EarDeployment.prepare(EarDeployment.java:58)
    at weblogic.application.internal.DeploymentStateChecker.prepare(DeploymentStateChecker.java:154)
    at weblogic.deploy.internal.targetserver.AppContainerInvoker.prepare(AppContainerInvoker.java:60)
    at weblogic.deploy.internal.targetserver.operations.ActivateOperation.createAndPrepareContainer(ActivateOperation.java:207)
    at weblogic.deploy.internal.targetserver.operations.ActivateOperation.doPrepare(ActivateOperation.java:98)
    at weblogic.deploy.internal.targetserver.operations.AbstractOperation.prepare(AbstractOperation.java:217)
    at weblogic.deploy.internal.targetserver.DeploymentManager.handleDeploymentPrepare(DeploymentManager.java:747)
    at weblogic.deploy.internal.targetserver.DeploymentManager.prepareDeploymentList(DeploymentManager.java:1216)
    at weblogic.deploy.internal.targetserver.DeploymentManager.handlePrepare(DeploymentManager.java:250)
    at weblogic.deploy.internal.targetserver.DeploymentServiceDispatcher.prepare(DeploymentServiceDispatcher.java:159)
    at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.doPrepareCallback(DeploymentReceiverCallbackDeliverer.java:171)
    at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer.access$000(DeploymentReceiverCallbackDeliverer.java:13)
    at weblogic.deploy.service.internal.targetserver.DeploymentReceiverCallbackDeliverer$1.run(DeploymentReceiverCallbackDeliverer.java:46)
    at weblogic.work.SelfTuningWorkManagerImpl$WorkAdapterImpl.run(SelfTuningWorkManagerImpl.java:528)
    at weblogic.work.ExecuteThread.execute(ExecuteThread.java:209)
    at weblogic.work.ExecuteThread.run(ExecuteThread.java:178)
    at weblogic.ejb.container.compliance.EJBComplianceChecker.check(EJBComplianceChecker.java:321)
    at weblogic.ejb.container.compliance.EJBComplianceChecker.checkDeploymentInfo(EJBComplianceChecker.java:280)
    at weblogic.ejb.container.ejbc.EJBCompiler.checkCompliance(EJBCompiler.java:789)
    at weblogic.ejb.container.ejbc.EJBCompiler.doCompile(EJBCompiler.java:222)
    at weblogic.ejb.container.ejbc.EJBCompiler.compileEJB(EJBCompiler.java:461)
    Truncated. see log file for complete stacktrace
>

Hi Rajendar,
I think the problem with having empty interfaces, or interfaces without methods for EJBs, is that they don't really make "sense". After deploying your EJB, a client application will use JNDI or dependency injection to access your EJB. So in your case it will look something like this
@EJB
    mytestSSBLocal myejb; //(In this case we are using the local interface)
In the second step, you will want to do something will your EJB, but since mytestSSBLocal doesn't define any methods, there is nothing you can do with your ejb.
The Exception is telling you that weblogic couldn't find a complaint interface for your EJB.
best regards, Nicolas

Abstract Classes & Interface Classes

Dear members of the Sun Community
My studies are progressing and just 1 period ago we started doing Object-Orinted Programming in Java and I must say I'm quite fond of it. It's become quite clear that OOP is an important aspect of Programming and just can't be missed. We've learned about Inheritance, Polymorfism, Mutators, Inspectors, Uses-Relationships and everything else however now I've come to the point where I got a problem:
Up until now we have been using normal classes to work with in which you could create objects and in your main program create objects from that class however. We've just learned about Abstract and Interface classes. As far as I'm concerned I'm quite confused with both of them.
If I am not mistaken (please correct me if I'm wrong) Abstract classes are classes from which you cannot create an object but is only used to make a subclass inherit everything from this superclass.
I am not quite sure what Interface classes are as they just plain confuse me. Would anyone be so kind to maybe explain what all of this is ?
Thanks a whole bunch
Herazio

Funny enough that already solved the question !
Thank you so much for the quick reply ^^
Herazio

Who can tell the difference of the abstract interface class?

someone ask me that he had a abstarct interface class, such as :
public abstract interface Book{
I was comfused, who can tell me why use it?

http://java.sun.com/docs/books/tutorial/java/interpack/interfaceDef.html
Scroll down to the bottom.
Drake

Business interface class count (EjbObject)

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