JavaBeans VS Enterprise JavaBeans

Hi everyone,
I hope someone can clarify this little problem for me.
I am a starting developer with the J2EE technology. I
am impressed what it is capable of and I want to
continu my study in it. I have been using JavaBeans
for a while now and I have noticed that in the J2EE
design, there is almost no word about the place of
javabeans. Is it that javabeans should be completely
replaced by Enterprise Beans or not?
Does a EJB have every advantages that a javabean has?
I hope someone can help me with an answer.
Thx a lot...Well, I guess somebody has to explain it to you :D - so, here it goes
A java bean is a configurable component (you know the story about accessors and mutators, dont you) EJBs are same and that is precisely where all the similarities end. EJBs run in a container i.e. their life cycle is controlled by an external entity, beans also can be the same way. However, if you want to learn EJB, start with Servlet to understand what containers are actually and how do they operate and behave and how they interface with servlets - EJB after that will be a cake-walk (though a bit restrictive) :D
[email protected]

Similar Messages

J2EE-EJB-Deploying an Enterprise JavaBean-deployment failure

I am unable to deploy a simple EJB application . I am using j2skee1.3.1 and J2SDK1.4.0
The related files and error messages are reproduced.
The java files and ear files are in d:\myjava\ejb
class path is .;d:\j2sdkee1.3.1\lib\j2ee.jar;D:\forte_jdk\j2sdk1.4.0\lib;d:\myjava
j2ee_home= d:\j2sdkee1.3.1
java_home=D:\forte_jdk\j2sdk1.4.0
path=%SYSTEMROOT%;%SYSTEMROOT%\command;c:;d:\j2sdkee1.3.1\bin;%SYSTEMROOT%\system32;%SYSTEMROOT%\system32\WBEM;C:\Program Files\Common Files\Adaptec Shared\System;D:\forte_jdk\j2sdk1.4.0\bin;d\j2sdkee1.3.1\javaservlets;d:\MSSQL7\BINN;D:\forte_jdk\j2sdk1.4.0\bdk1_1\beans\beanbox
Can any one suggest a solution.
************calculatorHome**********
import java.io.Serializable;
import java.rmi.RemoteException;
import javax.ejb.CreateException;
import javax.ejb.EJBHome;
public interface calculatorHome extends EJBHome
     calculator create() throws RemoteException, CreateException;
************calculator***************
import javax.ejb.EJBObject;
import java.rmi.RemoteException;
public interface calculator extends EJBObject
     public double dollorToRs (double dollars) throws RemoteException;
**********calculatorEJB***********************
import java.rmi.RemoteException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
public class calculatorEJB implements SessionBean
     public double dollarToRs (double dollars)
          return dollars * 48.15;
     public calculatorEJB() {}
     public void ejbCreate() {}
     public void ejbRemove() {}
     public void ejbActivate() {}
     public void ejbPassivate() {}
     public void setSessionContext (SessionContext sc) {}
***********************************descriptor*************
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC '-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN' 'http://java.sun.com/dtd/ejb-jar_2_0.dtd'>
<ejb-jar>
<display-name>newcalculatorjar</display-name>
<enterprise-beans>
<session>
<display-name>calculatorEJB</display-name>
<ejb-name>calculatorEJB</ejb-name>
<home>calculatorHome</home>
<remote>calculator</remote>
<ejb-class>calculatorEJB</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Bean</transaction-type>
<security-identity>
<description></description>
<use-caller-identity></use-caller-identity>
</security-identity>
</session>
</enterprise-beans>
</ejb-jar>
***************************error message*****
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE ejb-jar PUBLIC '-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN' 'http://java.sun.com/dtd/ejb-jar_2_0.dtd'>
<ejb-jar>
<display-name>newcalculatorjar</display-name>
<enterprise-beans>
<session>
<display-name>calculatorEJB</display-name>
<ejb-name>calculatorEJB</ejb-name>
<home>calculatorHome</home>
<remote>calculator</remote>
<ejb-class>calculatorEJB</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Bean</transaction-type>
<security-identity>
<description></description>
<use-caller-identity></use-caller-identity>
</security-identity>
</session>
</enterprise-beans>
</ejb-jar>
STATIC VERIFICATION RESULTS
     NUMBER OF FAILURES/WARNINGS/ERRORS
     # of Failures : 3
# of Warnings : 0
     # of Errors : 0
     RESULTS FOR EJB-RELATED TESTS
     FAILED TESTS :
     Test Name : tests.ejb.intf.remoteintf.RemoteInterfaceMatchMethodArgs
     Test Assertion : Remote interface business methods have matching method arguments test
     Test Description : For [ calculatorEJB ]
For Remote Interface [ calculator ] method [ dollorToRs ]
Error: No corresponding business method with matching arguments was found for method [ dollorToRs ].
     Test Name : tests.ejb.intf.remoteintf.RemoteInterfaceMatchMethodException
     Test Assertion : Remote interface business methods have matching method exceptions test
     Test Description : For Remote Interface [ calculator ] method [ dollorToRs ]
Error: No corresponding business method with matching exceptions was found for method [ dollorToRs ].
     Test Name : tests.ejb.intf.remoteintf.RemoteInterfaceMatchMethodReturn
     Test Assertion : Remote interface business methods have matching method return type test
     Test Description : For [ calculatorEJB ]
For Remote Interface [ calculator ] method [ dollorToRs ]
Error: No corresponding business method with matching return type was found for method [ dollorToRs ].
Thanks in advance.
Nagarajan

In EJB home you have -
public double dollorToRs (double dollars) throwsIn EJB you have -
     public double dollarToRs (double dollars)There is a spelling difference in the function name

While trying to import an Enterprise Javabean Model "No EJBs available"

Hi,
I´ve facing the following problem, it was working but suddenly it stopped.
I´ve created an EAR project that contains an EJB project, the EJBs are add to the public part, at least all the java classes that I want to access and the ear has another public part that references to the EJB public part, when I try to import it on Web Dynpro trying to create e new Enterprise javabeans it says to me that:No EJBs available, in fact it shows the project that contains the ejb but when i check and go next to list the EJB files in that project it says: No EJBs available.
Any idea of what is happeening?
Thanks and regards,
Eduardo

Hi
I think you forget one step : Copy the java bean that access EJBs into this web dynpro dc.
[Help1|Using EJB in Webdynpro
Best Regards
Satish Kumar

What is Enterprise JavaBean and Servlets?

Hi there..
I got kind of confused about enterprise JavaBean and Servlets.
Are there examples for them to help me understand each of them
Could someone kindly enlighten me. Thank u
AG

Keep a bookmark to http://java.sun.com/j2ee/tutorial/1_3-fcs/index.html

Enterprise JavaBeans & JavaBeans

Hi,
I wanted to build a j2ee based portal. These portal will not be accessed by many clients (<1000). I was told to use JavaBeans and not the Enterprise JavaBeans, as using the EJB will create unnecessary overhead. Is this a wise option? By using JavaBeans instead of EJB will it still be a J2EE application or a simple web based application. Is there an alternate solution to the above mentioned problem.
Thank u.

Find the difference between a simple java bean and EJB first, for simple applications you don't need to use EJBs.
You need to use EJB
If you need:
1) scalability in a larger sense,
2) cluster support from an application server,
3) more distributable architechture,
4) modular approach to the solution.
I don't know the difference between the the J2EE applicaion and simple web based application.

Enterprise JavaBean Model

Hi All ,
I am working on NWCE 7.1 . I have created Enterprise JavaBean model for sessions beans. I am refereing this tutorial link
https://help.sap.com/saphelp_nwce10/helpdata/en/45/f7fe8caea471fae10000000a1553f6/frameset.htm
But when i am rendering view inputfield for my input model attribute is read only. I have set cardinality of my request node to 1..1. still whn i am binding input model attribute under request node , its showing readinly whn view is rendered.
If i try to access request node using wdcontext.nodeRequest().size() i am getting exception as " model node element cannot be created without a model instance ". Read only property of inputfiled is set to fasle.Plz let me know how to resolve tihs.
Regards
Kavita

Hi Kavita,
Make sure your EJB application is deployed and started. If so, check whether its binaries (jar files) contain all the needed classes. The files are situated under /usr/sap/<SID>/JC<num>/j2ee/cluster/apps/<vendor>/<appName>/applicationjars/. Check also whether you EJB contains all the methods you are using from the Web Dynpro application.
Also search for any suspicious exceptions in the defaultTrace files (/usr/sap/<SID>/JC<num>/j2ee/cluster/server0/logs/). If any, please post here.
My final guess: have you added the last code snippet as shown here (in wdDoInit method):
https://help.sap.com/saphelp_nwce10/helpdata/en/45/f7f4c0c98d3482e10000000a1553f6/content.htm
Note that you should use the fully qualified name of the model, which means both the package and the class name, when registering the instance.
Best regards,
Vesselin

New Application window doesn't show 'Tutorial:Enterprise JavaBeans

Hello,
Topic: Tutorials: EJB Project
Step1: Begin the EJB tutorial
When I try to create a New Application for this tutorial, I can't see 'Tutorial:Enterprise
JavaBeans' in the new window as mentioned & pictured in the tutorial. When I
select 'Tutorial' from the left pane, I could see only two tutorial entries in
the right pane which are :
Tutorial: Process Application
Tutorial:Hello World Process Application
(Tutorial:Enterprise JavaBeans entry is missing)
Can I enable this entry by making changes to the configuration? How can I get
this entry? Please help...
I'm using server: C:\bea\weblogic81\samples\domain\workshop
Workshop version is 8.1 (Build:2003.0710.190003)
Thanks in advance.
Dharam.

Dharam,
This is part of Service Pack 2 for version 8.1 You can download 8.1 sp2 from
the product download website now. The version you are currently using is
WebLogic Platform 8.1 GA.
Regards,
Anurag
"Dharam Kulangara" <[email protected]> wrote in message
news:40296a9f$[email protected]..
>
Hello,
Topic: Tutorials: EJB Project
Step1: Begin the EJB tutorial
When I try to create a New Application for this tutorial, I can't see'Tutorial:Enterprise
JavaBeans' in the new window as mentioned & pictured in the tutorial. WhenI
select 'Tutorial' from the left pane, I could see only two tutorialentries in
the right pane which are :
Tutorial: Process Application
Tutorial:Hello World Process Application
(Tutorial:Enterprise JavaBeans entry is missing)
Can I enable this entry by making changes to the configuration? How can Iget
this entry? Please help...
I'm using server: C:\bea\weblogic81\samples\domain\workshop
Workshop version is 8.1 (Build:2003.0710.190003)
Thanks in advance.
Dharam.

Enterprise JavaBean Model context mapping problem with dates from CAF BO

Hi Experts,
using CAF BO inside WD Java is a little bit problematic!
The CAF core Datatype "Date" is exposed as "javax.xml.datatype.XMLGregorianCalendar".
This datatype is not bindable to context attributes, cause wd is only supporting native java types.
in this case, a java.sql.date is needed.
What is the best practise to use JavaBean Models (CAF BOs) with attributes of type "Date"?
The normal Adaptive RFC Model imports ABAP Dates as java.sql.dates!
Using CAF external services, all ABAP Dates are exposed also as XMLGregorianCalendar.
How can i use/bind such models with less programming effort?
Best wishes,
Holger

Hi Roelof,
CAF automatically decides which datatypes are used. It is not possible to change the used datatype
for imported external RFCs, so all ABAP Date Attributes will be typed as XMLGregorianCalendar.
This is different from the Web Dynpro Adaptive RFC Model, where ABAP Date Attributes are
converted as java.sql.date.
Best wishes,
Holger

What is an enterprise Javabean?

What is it??? And what can it do?

Enterprise Java Beans (EJBs) are used in server-side programming, most often for distributed environments. Most new java programmers, those that are just learning the J2SE API, don't really need to write one. However, if you are interested in doing client-server programming (or are already doing it without EJBs), you may want to use EJBs. EJBs are one of SUN's way of doing Remote Method Invocation (RMI). Let me further explain this. Lets say you write a client application which has its own Java Virtual Machine (JVM). Also, lets pretend that you have an application server, say Sybase's EAServer for example, and you write code on the server. The classes for the client are loaded into one JVM while the classes for the server are loaded into another JVM. How do you get a class on your client to execute a method in a class that lives in an entirely different JVM on the server? You could use an industry standard approach called CORBA. But its very complex to implement. So Sun came up with an easier way to do RMI (but it only supports java while CORBA is a specification that can be used by most languages). SUN also came up with the concept of EJB's that fully support RMI. So, you could write an EJB on the server side that accesses data from a database. This EJB will have methods that can be called from the client. Remember EJBs are loaded into their own JVM on the server. Using a protocol called IIOP, the client is capable of getting a handle (a reference) to this EJB and calling its methods to receive that data. This is cool stuff because you can write several different clients on different machines (different OS) in different languages and access the same EJB to retrieve the data.
There are different types of EJB's also. Session EJBs (Stateful and Stateless), Entity EJBs, and Message Driven EJBs. Of course, this is just a rudimentary explanation of EJB's. Don't even think about using them unless you are interested in doing client-server programming. EJB's are more complex than most java API's.
I hope this helped,
tajenkins

Cannot run Enterprise Javabean Project in Netbean 6.9.1

I just installed Netbeans 6.9.1 and created a Enterprise Java Bean project. I started the Glassfish server 3. The server started successfully. But now when i try to run the project it gives an error message saying that "HTTP 400 Bad Request. The web page cannot be found". The url of the application shows something like this,'http://localhost:8080/EnterpriseLibrary-war/' . It does not show up the index.jsp page. Can this be the reason?? I tries to fix this by setting up the welcome page in web.xml under Pages section. Can anyone help me solve the issue? What can be the possible reason for this error?
Any help in this regards is greatly appreciated.
Thanks in advance!!!!

I got the url from browser address bar.When i run the application from IDE it opens up IE n i get this url,http://localhost:8080/EnterpriseLibrary-war/
This is what i get when i start my GlassFish server. I can see that it is listening to port 8082.
May 13, 2011 2:29:17 PM com.sun.enterprise.glassfish.bootstrap.ASMain main
INFO: Launching GlassFish on Felix platform
Welcome to Felix
================
INFO: Perform lazy SSL initialization for the listener 'http-listener-2'
INFO: Starting Grizzly Framework 1.9.18-o - Fri May 13 14:29:51 IST 2011
INFO: Starting Grizzly Framework 1.9.18-o - Fri May 13 14:29:51 IST 2011
INFO: Grizzly Framework 1.9.18-o started in: 484ms listening on port 7676
INFO: Grizzly Framework 1.9.18-o started in: 1406ms listening on port 8082
INFO: Grizzly Framework 1.9.18-o started in: 1094ms listening on port 8181
INFO: Grizzly Framework 1.9.18-o started in: 1110ms listening on port 4848
INFO: Grizzly Framework 1.9.18-o started in: 1000ms listening on port 3700
INFO: Using com.sun.enterprise.transaction.jts.JavaEETransactionManagerJTSDelegate as the delegate
INFO: SEC1002: Security Manager is OFF.
INFO: Security startup service called
INFO: SEC1143: Loading policy provider com.sun.enterprise.security.provider.PolicyWrapper.
INFO: Realm admin-realm of classtype com.sun.enterprise.security.auth.realm.file.FileRealm successfully created.
INFO: Realm file of classtype com.sun.enterprise.security.auth.realm.file.FileRealm successfully created.
INFO: Realm certificate of classtype com.sun.enterprise.security.auth.realm.certificate.CertificateRealm successfully created.
INFO: Security service(s) started successfully....
INFO: Created HTTP listener http-listener-1 on port 8082
INFO: Created HTTP listener http-listener-2 on port 8181
INFO: Created HTTP listener admin-listener on port 4848
INFO: Created virtual server server
INFO: Created virtual server __asadmin
INFO: Virtual server server loaded system default web module
INFO: JTS5014: Recoverable JTS instance, serverId = [3700]
INFO: Portable JNDI names for EJB TestSessionBean : [java:global/EnterpriseLibrary/EnterpriseLibrary-ejb/TestSessionBean, java:global/EnterpriseLibrary/EnterpriseLibrary-ejb/TestSessionBean!SessionPkg.TestSessionBeanRemote]
INFO: Glassfish-specific (Non-portable) JNDI names for EJB TestSessionBean : [SessionPkg.TestSessionBeanRemote#SessionPkg.TestSessionBeanRemote, SessionPkg.TestSessionBeanRemote]
INFO: Loading application EnterpriseLibrary#EnterpriseLibrary-war.war at EnterpriseLibrary-war
INFO: Loading EnterpriseLibrary Application done is 36422 ms
INFO: GlassFish Server Open Source Edition 3.0.1 (22) startup time : Felix(23078ms) startup services(49203ms) total(72281ms)
INFO: Binding RMI port to *:8686
INFO: Hibernate Validator bean-validator-3.0-JBoss-4.0.2
INFO: Instantiated an instance of org.hibernate.validator.engine.resolver.JPATraversableResolver.
INFO: Created HTTP listener http-listener-1 on port 8082
INFO: Grizzly Framework 1.9.18-o started in: 16ms listening on port 8082
INFO: Perform lazy SSL initialization for the listener 'http-listener-2'
INFO: Created HTTP listener http-listener-2 on port 8181
INFO: Grizzly Framework 1.9.18-o started in: 16ms listening on port 8181
INFO: JMXStartupService: Started JMXConnector, JMXService URL = service:jmx:rmi://samir-4f36711ff:8686/jndi/rmi://samir-4f36711ff:8686/jmxrmi
INFO: [Thread[GlassFish Kernel Main Thread,5,main]] started
INFO: {felix.fileinstall.poll (ms) = 5000, felix.fileinstall.dir = D:\Program Files\glassfish-3.0.1\glassfish\domains\domain1\autodeploy\bundles, felix.fileinstall.debug = 1, felix.fileinstall.bundles.new.start = true, felix.fileinstall.tmpdir = D:\DOCUME~1\Samir\LOCALS~1\Temp\fileinstall--140954548172234423, felix.fileinstall.filter = null}
INFO: {felix.fileinstall.poll (ms) = 5000, felix.fileinstall.dir = D:\Program Files\glassfish-3.0.1\glassfish\modules\autostart, felix.fileinstall.debug = 1, felix.fileinstall.bundles.new.start = true, felix.fileinstall.tmpdir = D:\DOCUME~1\Samir\LOCALS~1\Temp\fileinstall--1877644427928429434, felix.fileinstall.filter = null}
INFO: Started bundle: file:/D:/Program%20Files/glassfish-3.0.1/glassfish/modules/autostart/osgi-web-container.jar
INFO: Started bundle: file:/D:/Program%20Files/glassfish-3.0.1/glassfish/modules/autostart/org.apache.felix.scr.jar
INFO: Portable JNDI names for EJB TestSessionBean : [java:global/EnterpriseLibrary/EnterpriseLibrary-ejb/TestSessionBean, java:global/EnterpriseLibrary/EnterpriseLibrary-ejb/TestSessionBean!SessionPkg.TestSessionBeanRemote]
INFO: Glassfish-specific (Non-portable) JNDI names for EJB TestSessionBean : [SessionPkg.TestSessionBeanRemote#SessionPkg.TestSessionBeanRemote, SessionPkg.TestSessionBeanRemote]
INFO: Loading application EnterpriseLibrary#EnterpriseLibrary-war.war at EnterpriseLibrary-war
INFO: EnterpriseLibrary was successfully deployed in 1,937 milliseconds.
INFO: Updating configuration from org.apache.felix.fileinstall-autodeploy-bundles.cfg
INFO: Installed D:\Program Files\glassfish-3.0.1\glassfish\modules\autostart\org.apache.felix.fileinstall-autodeploy-bundles.cfg
INFO: {felix.fileinstall.poll (ms) = 5000, felix.fileinstall.dir = D:\Program Files\glassfish-3.0.1\glassfish\domains\domain1\autodeploy\bundles, felix.fileinstall.debug = 1, felix.fileinstall.bundles.new.start = true, felix.fileinstall.tmpdir = D:\DOCUME~1\Samir\LOCALS~1\Temp\fileinstall-5357407348647107125, felix.fileinstall.filter = null}
And this is what i get when i run the application in Netbeans. Here it shows that is browsing on 8080!!
pre-init:
init-private:
init-userdir:
init-user:
init-project:
do-init:
post-init:
init-check:
init:
deps-jar:
deps-j2ee-archive:
EnterpriseLibrary-ejb.init:
EnterpriseLibrary-ejb.deps-jar:
EnterpriseLibrary-ejb.compile:
EnterpriseLibrary-ejb.library-inclusion-in-manifest:
Building jar: D:\Documents and Settings\Samir\My Documents\NetBeansProjects\EnterpriseLibrary\EnterpriseLibrary-ejb\dist\EnterpriseLibrary-ejb.jar
EnterpriseLibrary-ejb.dist-ear:
EnterpriseLibrary-war.init:
EnterpriseLibrary-war.deps-module-jar:
EnterpriseLibrary-war.deps-ear-jar:
EnterpriseLibrary-ejb.init:
EnterpriseLibrary-ejb.deps-jar:
EnterpriseLibrary-ejb.compile:
EnterpriseLibrary-ejb.library-inclusion-in-manifest:
EnterpriseLibrary-ejb.dist-ear:
EnterpriseLibrary-war.deps-jar:
EnterpriseLibrary-war.library-inclusion-in-archive:
EnterpriseLibrary-war.library-inclusion-in-manifest:
Copying 1 file to D:\Documents and Settings\Samir\My Documents\NetBeansProjects\EnterpriseLibrary\build
EnterpriseLibrary-war.compile:
EnterpriseLibrary-war.compile-jsps:
EnterpriseLibrary-war.do-ear-dist:
Building jar: D:\Documents and Settings\Samir\My Documents\NetBeansProjects\EnterpriseLibrary\EnterpriseLibrary-war\dist\EnterpriseLibrary-war.war
EnterpriseLibrary-war.dist-ear:
pre-pre-compile:
pre-compile:
Copying 1 file to D:\Documents and Settings\Samir\My Documents\NetBeansProjects\EnterpriseLibrary\build
do-compile:
post-compile:
compile:
pre-dist:
post-dist:
dist-directory-deploy:
pre-run-deploy:
Starting GlassFish Server 3
GlassFish Server 3 is running.
Undeploying ...
Initial deploying EnterpriseLibrary to D:\Documents and Settings\Samir\My Documents\NetBeansProjects\EnterpriseLibrary\dist\gfdeploy\EnterpriseLibrary
Completed initial distribution of EnterpriseLibrary
post-run-deploy:
run-deploy:
Browsing: http://localhost:8080/EnterpriseLibrary-war/
run-display-browser:
run-ac:
run:
BUILD SUCCESSFUL (total time: 1 minute 58 seconds)

Enterprise JavaBeans and SNMP Java Connector

There is possible to develop a Java Connector that will allow my J2EE application to collaborate ( send , receive) SNMP commands with various network devices ( sensors, Access Points, hardware devices).
The information eventualy will be pushed back to the subscribed users using AJAX technologies.
Mike

Hi,
I do not get your question.....
You want to connect from MI7.1 directly to a BAPI in the Middleware? Well, in 7.0 there was Generic Sync to do that - and I think this should be still there. With Generic sync it was possible to connect to call any BAPI in the middleware directly - if your user had appropiate rights. Check MDK for details.
And if you want to do that in our own app - if this is the intention of your question.... well.... then I would tell you this is under SAP (C), so as you know you could decompile the MI client code, but this is not allowed.
But I guess it was the first thing you are after, so see if that answer helps. But even there you need the running MI middleware - and this thing confused me in your question - are you using MI already or not and what do you want to do?
Regards,
Oliver

Compiling Enterprise JavaBeans and Its Interfaces

I've downloaded j2sdk1.4.1_02 and can't compile any code that imports
javax.servlet.* and javax.servlet.http.*
The install ZIP file has a JAVAX directory but no SERVLET or SERVLET.HTTP subdirectory.
What's the going on? Am I missing some isoteric point? Shouldn't the JAVAX contain SERVLET and SERVLET.HTTP stuff?

That's just the base SDK. If you want J2EE, you either need to get the J2EE reference implementation or a J2EE-compliant container. Several have been suggested on this forum: Tomcat, JBoss (JETTY or Tomcat), Orion, etc.
J2EE is not part of the default package.

Enterprise JavaBeans Project

I am working on a project: A server will load messages (XML Strings) into a IBM MQ. Another server will pull these messages and execute the necessary business logic.
I will be responsible for the latter part (pull msgs and apply business logic). This server has bea WebLogic 8.1 and Oracle database.
Here is the issue: I am new to bea Weblogic and EJBs and so I am having difficulty putting all of it together in terms of design or architecture. From all that I have read, I realize that I will be using MDB (message driven beans) to pull the messages, then use SessionBeans (stateless likely) to work on the message (use XMLBeans to extract the message content, and then apply the business logic which eventually create a SQL statement that needs to be executed on the Oracle database).
I know I am still unsure of a lot of things and need to pull this one in matter of 2 weeks. What do you guys recommend and any key points that you can offer that can help me accelerate into understanding how to develop this project?
Some of the questions I have are:
1) How do I configure WebLogic to connect to the MQ to pull the messages and remove it only when I am doing processing it successfully?
2) Should I even bother with SessionBean or use plain java (POJO - plain old java objects) to implement the rest (business logic, xml parsing, sql execution)?
3) I know if I use SessionBeans I should use pooling to improve performance as we expect many messages. How do i configure Weblogic for the pooling or how do I tell MDB how to call a SessionBean from the pool?
4) If I should use XMLBeans to parse the XML strings, do I use Weblogic to pool?
5) Should I use JDBC connection pooling or should I use Weblogic to do the connections? I know I will be executing mostly select, insert and deletes on prolly only one table.
6) Given that the messages do inserts or deletes only on one table, is it even worth having SessionBeans Pool, XMLBeans pool, connection pool?
Thanks for any and all the help.

I am working on a project: A server will load messages (XML Strings) into a IBM MQ. Another server will pull these messages and execute the necessary business logic.
I will be responsible for the latter part (pull msgs and apply business logic). This server has bea WebLogic 8.1 and Oracle database.
Here is the issue: I am new to bea Weblogic and EJBs and so I am having difficulty putting all of it together in terms of design or architecture. From all that I have read, I realize that I will be using MDB (message driven beans) to pull the messages, then use SessionBeans (stateless likely) to work on the message (use XMLBeans to extract the message content, and then apply the business logic which eventually create a SQL statement that needs to be executed on the Oracle database).
I know I am still unsure of a lot of things and need to pull this one in matter of 2 weeks. What do you guys recommend and any key points that you can offer that can help me accelerate into understanding how to develop this project?
Some of the questions I have are:
1) How do I configure WebLogic to connect to the MQ to pull the messages and remove it only when I am doing processing it successfully?
2) Should I even bother with SessionBean or use plain java (POJO - plain old java objects) to implement the rest (business logic, xml parsing, sql execution)?
3) I know if I use SessionBeans I should use pooling to improve performance as we expect many messages. How do i configure Weblogic for the pooling or how do I tell MDB how to call a SessionBean from the pool?
4) If I should use XMLBeans to parse the XML strings, do I use Weblogic to pool?
5) Should I use JDBC connection pooling or should I use Weblogic to do the connections? I know I will be executing mostly select, insert and deletes on prolly only one table.
6) Given that the messages do inserts or deletes only on one table, is it even worth having SessionBeans Pool, XMLBeans pool, connection pool?
Thanks for any and all the help.

How to deploy Enterprise JavaBeans in JBoss server.pls help me

anybody can help me,how to deploy SessionBeans,CMP,BMP,JMS in jb oss server.pls explain me the steps for how to deploy EJB in JBoss server.what are the steps i have to follow.

Hi Chris,
Yes, I have created a MSI package for the application and installed it on the server.
I have created the run time package for powerbuilder and install it on the server.
I have installed the DB Client drivers also.
Can you please help me on how to the configure the application pools, as i never worked on this stuffs,In developemnt enviornment just click on the run webservice and its there .
Regards
Subrat

How can I use a JavaBean in another JavaBean?

I create a JavaBean named "dbBean.java"
And I create another JavaBean named "login.java" which want to use the method defined in "dbBean.java".
Could anyone tell me the syntax of using it?

compile the .java files into .class files and then they are usable
from dbBean...
login myLogin = new login();
perhaps you want to use it in some script and not java?

JavaBeans VS Enterprise JavaBeans

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