How to use EJB in Distributed Environment

Hello
I have to use the EJB in a distributed environment. There will be a Application server at one system which will access the Application server at another system which will be running ejb. I am using SAP J2EE Engine as application server.
So I would be thankful if anybody could tell me what are the steps to implement EJB in such a distributed Environment.
Venkat

You can implement your EJB as usual.
On the client side (i think this is also SAP J2EE, right?) you'll need the ejbclient.jar to have the interfaces of the EJBs available. In addition you need to feed the context factory with provider, username, password and context factory. etc.
An example can be found here:
http://help.sap.com/saphelp_nw70/helpdata/en/9b/a420ff77d6854bac64d0c4f1599ed0/frameset.htm
The example above uses a Corba factory for connection. The EJB standard RMI IIOP factory is "com.sap.engine.services.jndi.CosNamingInitialContextFactoryImpl" I think.
Markus

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hello,
i am novice programmer in EJB.
i am using weblogic 6.1 ...
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my code is as follow..but its not displaying any result.
<%@ page import="javax.naming.InitialContext,
javax.naming.Context,
java.util.Properties,
firstEJB.First,
firstEJB.FirstHome"%>
<%
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%>
<html>
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     </head>
     <body>
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</html>
please tell me the solution.

Hi, I don't know if it may be the cuase of your problems, but you should narrow the Object obtained doing the lookup, like this:
FirstHome home = (FirstHome) PortableRemoteObject.narrow(ctx.lookup("FirstEJB"), FirstHome.class);

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I've used beans in JSP.. but how to use EJB's in beans ??
EJB's are deployed in Oracle 8i
Please Help
Thank You.

Please find the answer in this HOWTO:
http://technet.oracle.com:89/ubb/Forum2/HTML/006404.html
HOWTO's are archived on the JDeveloper Documentation page:
http://technet.oracle.com/docs/products/jdev/listing.htm (Click on Documentation Tab)
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You can implement your EJB as usual.
On the client side (i think this is also SAP J2EE, right?) you'll need the ejbclient.jar to have the interfaces of the EJBs available. In addition you need to feed the context factory with provider, username, password and context factory. etc.
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http://help.sap.com/saphelp_nw70/helpdata/en/9b/a420ff77d6854bac64d0c4f1599ed0/frameset.htm
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Hi,
I want to call ABAP function module using ejb(Since I want to expose them as web service on different server). I know how to do that using Models, but dont know how to go ahead using ejbs.
Could you please guide me on this?
Regards,
Abhijeet.

Hi,
In another thread with a similar question I found these references:
/people/kathirvel.balakrishnan2/blog/2005/07/26/remote-enable-your-rfchosttoip-to-return-host-ip-to-jco
Re: interfacing SAP with an existing java applications
And this code example:
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          mConnection = getConnection();
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Good luck,
Roelof

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http://www.stardeveloper.com/articles/display.html?article=2001081301&page=1
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http://jakarta.apache.org/taglibs/tutorial.html
http://www.ibm.com/developerworks/edu/j-dw-java-custom-i.html
http://www.herongyang.com/jsp/tag.html

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hi
i created 8 methods in ejb now
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Hi Mitesh,
Sorry if I got you wrong, but if you are asking how to use an ejb in WebDynpro this thread may help you https://www.sdn.sap.com/sdn/collaboration.sdn?contenttype=url&content=http%3A//forums.sdn.sap.com/profile.jspa%3FuserID%3D635050 If your question is how to display the retrieved data on the screen, then you yourself will be best person to decide as no one else knows what data is being retrieved and how large they are.
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many thanks
sri

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not sure. If I add it to the frame, can I call it
whenever I need to use it like when I click the
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I have web application as jsp files.
and I made .jar for some EJBs
and I used local call for calling EJB from jsps in WLS 6.1
but in WLS 7.0 .. occured error calling EJB as Local call
while JNDI lookup.
So I packed all applications as EAR and deployed then all works good.
but in developing I want to use JSPs as jsp files.
There is no way to use Local call to EJB in WLS 7.0 without packing EAR ? (like
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The way JNDI lookups were implemented in 6.1 allowed to deploy individual ejb-jars
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to deploy the ear (no matter whether it is exploded or not). It takes minutes
with 1.3 and debugging turned on.
6.1 implementation allowed to "pre-deploy" relatively static ejb-jars and still
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which takes only seconds. We didn't have problem with JNDI lookup performance
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The behind-the-scene JNDI optimization "improvement" introduced in 7.0 makes it
no longer possible to use this technique, since even though classloading still
works in the same way, no objects are bound to JNDI tree and thus could not be
access from another ejb-jar. This significantly impacts developer productivity
(in our large project). It's not only about minutes lost (which btw makes hours
over time), it just disrupts developer's train of thought to have such long round
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Is it possible to provide an option to turn this "optimization" off and actually
bind JNDI objects?
Thank you,
Sergey
"Dimitri I. Rakitine" <[email protected]> wrote:
Park <[email protected]> wrote:
Thanks Rakitine.
I wonder if I use EAR while developing could I apply changes to EARwhithout packing
again.Sure - you can simply deploy your app as an 'exploded' EAR during development.
There is no probelm delivering time but in developing time ..
If I can not use that kind of way how can I make modification ?
Plz. let me know.
And I have one more question.
When I use EAR I met some problem.
I packed all JSP into one .war file.
fot that I had to inclde requred classes into .war because jsps usethese classes.
then I packed EAR file with WAR and some EJB jar files.
After then I deployed EAR file to WLS.
But If remove classes from classpth while EJB deploying Error occured.Because
EJBs reference these classes.
I thoght if I packed classes into .WAR .. there is no problem.
But Error occured.
I have to include classes into classpth for that ? or
Any mistakes in my way.No, you do not have to add anything to the system classpath. In fact,
you should
make sure that none of your application classes are in the system classpath.
thank you.
"Dimitri I. Rakitine" <[email protected]> wrote:
Yup, that appears to be the difference between 6.1 and 7.0 - in
6.1 success of a local invocation depended only on the Classloaders
arrangement, so everything worked when you added your classes to the
system classpath. In 7.0 looks like it also depends on the application
context - that's why you cannot do a JNDI lookup from another deployment
unit.
Is there any reason why you do not want to use EAR's ???
Park <[email protected]> wrote:
in WLS 6.1 ..
I have EJB as jar files. (deployed each to WLS)
and I added EJB interface class to classpath.
and I made WebApplication as Directory (not war file).
in that webappication jsp call EJB as Local interface.
These environment .. local call workes well in WLS 6.1.
but in 7.1 not works .. (JNDI look up error)
of course Remote call works well. and If I make EAR .. works well.
Rob Woollen <[email protected]> wrote:
You can have an exploded EAR and have it work.
Can you give some more detail on how you are deploying in 6.1. Is
it
an
exploded EAR, or do you have the ejb interfaces in the classpath?
This behavior should not have changed between 6.1 and 7.0.
-- Rob
park wrote:
I have web application as jsp files.
and I made .jar for some EJBs
and I used local call for calling EJB from jsps in WLS 6.1
but in WLS 7.0 .. occured error calling EJB as Local call
while JNDI lookup.
So I packed all applications as EAR and deployed then all works
good.
but in developing I want to use JSPs as jsp files.
There is no way to use Local call to EJB in WLS 7.0 without packingEAR ? (like
WLS 6.1)
Dimitri
Dimitri

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i am using CMP EJB with OC4J server
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thanks
warm regards
vikassheelgupta

<ejb-ql>select object(o) from Partymas o where o.stationCode like '?1' and
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Hello,
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DESNAME: EMAIL_ADDRESS (this is the column in the database table which holds the emails of each clients, to whom the report is going to be sent; each client receives his/hers invoice)
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COPIES: 1
I save, and then File >> Distribute, (asks me that is going to be send to multiple destinations) says: Distribution completed succesfully. BUT nothing happens (no emails).
Questions:
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2. Where could i see the activity logs of the application (are there any), where i could investigate what is going on in the backend?
Thank you,
Michael.

Hi there guys,
I have tracked down my mistaked.
in the object navigator, i clicked on main, then in the body i have spotted down the R_ section, clicked on it, and then in the report design i have deleted. Then it worked like a charm.
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1. How can i configure all the details that will be displayed in the email? (like sender, subject, body etc.) Using the distribution box it gives me no alternative, in the distribution XML i can do this by editting all the details.
2. How can i log all the responses that i get from each e-mail address to which has an email been sent. For example, one e-mail address is not valid anymore, i want to grep the answer that the mail server receives and in the end, to make a report ( out of 100% - 20% failed, 80% succesfully delivered). How can i accomplish this task?
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Michael.

How to use EJB 3.0 in Visual Pack Web ?

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thanks

I have a similar question: How can you set up entities and persistence units when working in a visual web project created using the Visual Web Developer pack?
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I've a few questions about the usage of the AppStore in business environments.
We have round about 25 Macs in our office.
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Not every Mac have an internet connection.
Nobody own a credit card from the company.
Okay, I have an Apple-ID but only for my own personal usage combined with my own personal and private credit card. But I don't want to pay the company bills with my credit card. Can I create an Apple Account for business usage without having a credit card from the company? Like Amazon, where we have a business account and where we pay our bills by direct debit. This works fine, is there a possibility to pay in AppStore by direct debit?
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Maybe someone can bring some light into this dark and cold prospect.
Thanks in advance & bye Tom

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Newbie-how to use EJB in JSP?

Can some one please point me to any sources, tutorials, examples on using
          enterprise javabeans in JSP?
          How can I use an entity bean home interface or findByprimaryKey methods in
          JSP?
          Thanks in advance.


look at /examples/jsp/EJBeanManagedClient.jsp in your WLS distribution.
          Kumar
          Manmari wrote:
          > Can some one please point me to any sources, tutorials, examples on using
          > enterprise javabeans in JSP?
          > How can I use an entity bean home interface or findByprimaryKey methods in
          > JSP?
          >
          > Thanks in advance.

How to use EJB in Distributed Environment

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