EJB support

Is it possible to use JHeadstart in combination with EJB's?

It is not supported out of the box. You could write session beans that implement the JHeadstart handler interface, but this is not a trivial task to do.
The JHeadstart release that aligns with ADF (10.0, targeted for end of june 2004) will use the ADF data binding layer which means EJB's are fully supported.
If you can't wait for this JHeadstart release, it might be a better option to start with JDeveloper 10g and ADF rather than the current Jheadstart release, as EJB support is very strong in JDeveloper 10g. Once JHeadstart is available you can still start using it, as it is entirely based on the ADF design time and runtime environment.
Steven Davelaar,
JHeadstart Team.

Similar Messages

Weak EJB support

Hi,
I tried Jdev2 with AppServer 4.0.7 to build EJB-based
application. I'm disappointed with EJB support in AppServer.
It is not standard and based on CORBA. Comunication between
client and EJB server goes via ORB. In case of applet client
it have to download two big ORB libraries (aprox. 0.8 MB each)
in addition to it's own code. Maybe I'm wrong, but it seems
to me that AppServer in current state not sutable EJB container
for production system.
Will be situation improved in next relese of AppServer or
Oracle8i?
When Oracle8i will be available for trial download?
Vladimir
null

JDeveloper Team (guest) wrote:
: Vladimir (guest) wrote:
: : Hi,
: : I tried Jdev2 with AppServer 4.0.7 to build EJB-based
: : application. I'm disappointed with EJB support in AppServer.
: : It is not standard and based on CORBA. Comunication between
: : client and EJB server goes via ORB. In case of applet client
: : it have to download two big ORB libraries (aprox. 0.8 MB
each)
: : in addition to it's own code. Maybe I'm wrong, but it seems
: : to me that AppServer in current state not sutable EJB
container
: : for production system.
: : Will be situation improved in next relese of AppServer or
: : Oracle8i?
: : When Oracle8i will be available for trial download?
: : Vladimir
: You are right that the EJB support in the AppServer is not
: complete. With version 4.0.8 that will be improved. Oracle8i
has
: EJB support according to the EJB spec. Not sure about
availablity
: for download. Possibly the 8i production release.
Could you give some details? Will Entity beans or EJBHome
interface be supported? For example, JDeveloper offers an option
to create Entity bean in EJB descriptor wizard. But there is no
place to deploy that Entity bean. Oracle8i doesn't support Entity
bean either.
Andrei
null

EJB support in Oracle products

I'm curious. Since current Oracle products only support session
beans and not entity beans, what can be done with just the
session beans? I would love to be able to get the full
utilization of EJB, but would have to acquire "a whole nother"
server (like WebLogic) for that. I understand that the next
releases of Oracle products (such as JDeveloper 3) will have
full support for entity beans, but what am I to do until then?
Would it be wise to develop session beans that directly access
databases instead of the entity beans? It doesn't make much
sense to me.
Thanks,
Steve
null

Hi
JDeveloper 2.0 (which is in Producition) allows you to create
either session or entity beans (EJB) from the EJB Wizard. But
there is no deployment support yet. The next release of Oracle8i
will have support for Entity beans.
regards
raghu
Steve Magruder (guest) wrote:
: I'm curious. Since current Oracle products only support
session
: beans and not entity beans, what can be done with just the
: session beans? I would love to be able to get the full
: utilization of EJB, but would have to acquire "a whole nother"
: server (like WebLogic) for that. I understand that the next
: releases of Oracle products (such as JDeveloper 3) will have
: full support for entity beans, but what am I to do until then?
: Would it be wise to develop session beans that directly access
: databases instead of the entity beans? It doesn't make much
: sense to me.
: Thanks,
: Steve
null

EJB support class won't die.

I have a jar file that contains an EJB. The EJB acts as a facade so that all clients
can talk to it's
own separate EJB instance, but each facade talks to a single, static class instance.
Therefore,
that static support class is the place where everything client request goes through.
Here's my problem. This support class has a small Java GUI associated with it.
When it is first
instantiated, the GUI appears. There is a button on the GUI that will kill this
instance. However,
when I attempt to kill this instance by calling dispose and making all references
to it null, it has
no effect. The bean remains alive. I can't get it to get garbage collected.
Any advise?
Thanks,
Joel

Joel,
You can not use interactive utilities on server side
by definition. I mean - you sure you can, but it's not
going to work. So the only way to fix your problem
is to rewrite this utility, or to ask your vendor to do it.
Regards,
Slava Imeshev
"Joel" <[email protected]> wrote in message
news:3ee4d43f$[email protected]..
>
I have a jar file that contains an EJB. The EJB acts as a facade so thatall clients
can talk to it's
own separate EJB instance, but each facade talks to a single, static classinstance.
Therefore,
that static support class is the place where everything client requestgoes through.
>
>
Here's my problem. This support class has a small Java GUI associatedwith it.
When it is first
instantiated, the GUI appears. There is a button on the GUI that willkill this
instance. However,
when I attempt to kill this instance by calling dispose and making allreferences
to it null, it has
no effect. The bean remains alive. I can't get it to get garbagecollected.
Any advise?
Thanks,
Joel

Why does 9i AS have such lame EJB support? Where is this product going?

I installed 9i AS and really became disgusted with the product.
Oracle shows it's shameless corporate greed by hyping 9iAS as an EJB server -but 9iAS doesn't even support ejb 1.1 !! No entity beans! What a rip off...
Where is this product going? ejb 1.2 is already comming into the market....www.orionserver.com... BUT oracle doesn't even have 1.1 down yet....
What is the estimated development track for 9iAS?
As for me, I am ready to return my 9iAS copy...

Which version was giving you problems?
The latest version of O9iAS does in fact support EJB 1.1 (Session & Entity Beans with both Container Managed Persistence and Bean Managed Persistence). As well as Servlet 2.2, and JSP 1.1.
It does this through Oracle's Enterprise Java Engine, a highly scaleable reliable and available Java virtual machine. Unlike other JVMs, the EJE provides built in session isolation so programmers don't need to worry about thread collisions, concurrent garbage collection, or any of those things. Plus, you can compile the bytecode to native code before runtime for better performance.
That said... I agree the install could be a little simpler, but if you look at everything it's trying to install... you'll realize it's not trivial. Reading the documention is highly recommended.
-=< Nick >=

EJB Supporting Different Application Server

I have a task to develop an session/entity bean(for both select and insert) which needs to be called from both WebSphere Application Server(4.x) and Resin Application Server
For your information - WAS uses EJB(1.1) and Resin uses EJB(2.0).
I want to create this session/entity bean which works on both application server without doing any change in code. Is that really possible. If YES - HOW ? Please suggest if you really know anything on this topic. Thanks.
Zahid.

So - Which Entity Bean should I use. CMP or BMP. I would prefer CMP as I do not have to write code for callback methods. Cracker - could I contact you. If yes - please email me at [email protected] I really need help on this and want to complete this. Won't take much of your time. Thanks.
Zahid.

EJB Support in JDeveloper9i UML Editor

Hi,
I was wondering if there is support for Enterprise JavaBeans in JDevelopers' UML Editor? I tried dragging and dropping a previously created bean into the UML Editor pane but that didn't work.
If this can be done, I would appreciate it if anyone could tell me how this is achieved.

Fergal,
This functionality is not in the 9.0.2 Production Release but has been implemented in the next release of JDeveloper, but I'm not sure when that will be available yet.
Thanks,
Lisa
JDev QA

Java API's supported in the Jdeveloper, IAS, and RDBMS product components

If there are any technical errors or "mistatement of the facts" in this posting, please let me know about them ..
This article is being delivered in Draft form and may contain
errors. Please use the MetaLink "Feedback" button to advise
Oracle of any issues related to this article.
PURPOSE
This article describes the "Enterprise Java Beans" (EJB), "Java Server Pages"
(JSP) and servlets Application Programming Interfaces (API) supported by the
Oracle products, Jdeveloper, Internet Application Server (IAS) and the Oracle
RDBMS release 2 and release 3, also known as Version 8.1.6 and 8.1.7,
respectively.
SCOPE & APPLICATION
All parties interested in the Java API's supported by these products.
Java API's supported in the Jdeveloper, IAS, and RDBMS product components
JDEVELOPER
JDEVELOPER is Oracle's Java development tool designed for coding / development,
testing / debugging, and deployment of Java Applications to the IAS and
RDBMS platforms.
With the java software api's being in a constant state of evolution, each new
release of Jdeveloper adds support for the "then current" version of the java
software api's, if it does not already have it implemented.
JDEVELOPER SERVLET API JSP API EJB API
VERSION VERSION VERSION VERSION
3.2.X.X 2.2 1.1 1.1
3.1.X.X 2.1 1.0 1.0
NOTE :
Sun Microsystems and their advisory teams (Oracle is on it) is working on
"draft" specifications for the next version of all of these API's
EJB -------> http://java.sun.com/products/ejb/index.html
JSP -------> http://java.sun.com/products/jsp/index.html
Servlets --> http://java.sun.com/products/servlet/?frontpage-javaplatform
It is anticipated that future releases of Jdeveloper will continue to be
upgraded to include support for the next version of each api.
To obtain the latest information on Oracle's Internet Development Suite (IDS)
of tools, please review the "Internet Developer Suite" information located
on Oracle's technet web site at :
http://technet.oracle.com/products/index.htm
IAS
IAS is Oracle's next evolution of the web server and application server
product technology superceeding the Web Application Server (WAS) and Oracle
Application Server (OAS) product lines.
IAS SERVLET API JSP API EJB API EJE VERSION
VERSION VERSION VERSION VERSION SUPPORTED
9I(1.0.2) 2.2 1.1 1.1 817
8i(1.0.1-NT) 2.0 1.0 1.0 816
8i(1.0.0-UNIX) 2.0 1.0 1.0 816
The IAS product contains two Java Virtual Machines (JVM) within it's
architecture.
They are called :
1) APACHE JSERV servlet engine
2) ORACLE ENTERPRISE JAVA ENGINE (EJE)
APACHE JSERV servlet engine
The APACHE JSERV servlet engine is an EXISTING product licensed from the
apache group which supports the servlet api 2.0.ONLY.
The APACHE JSERV product does not support ANY JSP's unless the customer
installs a third party jsp engine.
The IAS 8i/9i which has the APACHE JSERV product embedded in it, comes with
Oracle's JSP engine (OJSP) already integrated into it. OJSP supports JSP's up
to the specific JSP engine version documented in the Oracle Universal
Installer (OUI) for the 8.1.7 RDBMS or the IAS products. It is also documented
in the product's release notes.
Oracle ENTERPRISE JAVA ENGINE (EJE)
The EJE formerly known as :
1) Oracle 8i Java Virtual Machine (JVM)
2) JSERVER component,
3) Aurora JVM
was originally releas ed in the RDBMS 8.1.5 database with jdk 1.1.6 based java
support.
The currently supported versions of the Oracle 8i RDBMS, versions 2 and 3,
also known as Version 8.1.6 and 8.1.7, respectively, provides a jdk 1.2.1
based java virtual machine support.
"EJE" Version 816
This EJE, found in rdbms 8.1.6 and IAS 8i, contains support for the ejb
api 1.0, corba, and java stored procedures.
"EJE" Version 817
This EJE, found in rdbms 8.1.7 and IAS 9i, contains support for the ejb,
corba, and java stored procedures as well as the Oracle Servlet Engine (OSE)
which provides support for the servlets 2.2 api and JSP 1.1 api.
Note :
EJB support in the "EJE" Version 817 has been upgraded to comply with the EJB
1.1 api specification which includes "entity beans" support.
What is the bottom line ??
1) Servlets deployed to the APACHE JSERV must comply with servlet api 2.0.
2) Servlets 2.1 or higher are only supported in EJE's OSE component found in
the rdbms 817 or ias 9i products. Servlets api 2.0 can also run in the OSE.
References
1) "Oracle9i Application Server Technical White Paper" located at :
http://technet.oracle.com/products/ias/pdf/9ias_102.pdf
2) "Whats New? Oracle8i JVM Accelerator, Oracle Servlet Engine, OracleJSP ..."
located at :
http://technet.oracle.com/products/oracle8i/pdf/504.pdf
3) "Oracle8i Release 3 New Features Summary" located at :
http://technet.oracle.com/products/oracle8i/pdf/8iR3_nfs.pdf
null

which jvm is used by jserv ?? EJE or a separate jdk ?
The Jserv servlet engine is running in a separate jdk JVM external to the EJE jvm which is embedded within the "database" component of ias and the RDBMS.
See the reference below for more details ...
if jserv only support old apis, why it is in oracle's products ?
i would assume that the oracle servlet engine was under development when ias 8i was released and became available in time for the ias 9i and rdbms 817 products.
looking back in history leads me to believe ias 8i was a migration path to get to ias 9i or rdbms 817.
Based upon the long history of new releases of every oracle product being upgraded with new features, it's reasonable to assume that these products will continue to evolve.
when I deploy a jsp how to deploy in the right servlet container ("EJE") ?
as documented in the reference below, you can deploy JSP's to either the apache jserv jvm or the EJE since the ORACLE JSP engine functionality is in both jvm's.
there are many posts where you can see that people have deploy in jserv and they have problems because they don't use the right container (servlet 2.0 instead of
servlet 2.2) http://technet.oracle.com:89/ubb/Forum2/HTML/006349.html
when ias 8i came out this was clearly an issue since servlet support was at api 2.0, and the current servlet api was probably at 2.1.
oracle clearly made every effort to get ias 9i released quickly to supply a servlet 2.1 and 2.2 capable engine to resolve this issue.
since ias 9i and rdbms 8.1.7 are available this is no longer an issue.
The reference below explains the architecture and understanding it would eliminate a lot of "deploy to the wrong ias 9i component" issues.
so why jserv is bundled with oracle 8i/9ias since EJE support the right api version ?
if in ias 9i release , oracle had removed the jserv component without any advance warning, many customers would have been very upset since oracle makes every attempt to give advance notice before removal of functionality.
References
1) "Oracle9i Application Server Technical White Paper" located at :
http://technet.oracle.com/products/ias/pdf/9ias_102.pdf

EJB finder query with ORDER BY clause

Hi,
How to query the data in ordered list using Order By clause in the entity Bean.
Here is the part of My code in which i am interrested.
/* @ejbgen:finder
* signature = "Collection findAllData()"
* ejb-ql = "SELECT OBJECT(z) FROM DataProfileBean AS z"
abstract public class DataProfileBean extends EntityAdapter {
* @ejbgen:cmp-field column = DATA_PREFIX
* @ejbgen:primkey-field
* @ejbgen:local-method transaction-attribute = Required
public abstract Integer getDataPrefix();
public abstract void setDataPrefix(Integer DataPrefix);
Now what modification needs to be done in the ejb-ql query to find the DataPrefix in the sorted list.
Regards,
Dilip

I don't think the current spec for EJBs support ORDER BY. But Weblogic has an extension that you can use (that is, if you're using it). Here's the info: http://e-docs.bea.com/wls/docs61/ejb/cmp.html#1076421

UML to EJB

Hi all,
i am using Sun Java Studio Enterprise 8.1 and i see there is a UML-Tool. Can i model with this UML-Tool an ejb-architecture? if yes, please say me how, or is there anyone tutorial or document to learn that.

Sun Java Studio Enterprise 8.1 is based on NetBeans 5.0 (and provides features such as UML modeling as add-ons to NetBeans 5.0). Since then UML module itself has been open-sourced and is being developed at netbeans.org.
For UML modeling, you may want to work with the latest versions of NetBeans and install the UML module add-on on top of it.
- NetBeans 5.5.1
Download and install the ide from http://www.netbeans.org/
Bring up the ide and use 'Tools | Update Center' menu to download and install UML module from the Update Center
- NetBeans 6.0
You can download the latest milestone of NB6 from http://dlc.sun.com/netbeans/download/6.0/milestones/latest/ .
uml.netbeans.org provides the starting page for UML module. From here there are links to documentation, faqs, blogs and other information.
Regarding EJB support:
UML for NetBeans 5.5 supports design patterns for ejb:
From http://www.netbeans.org/products/uml/:
here is a full set of predefined and extensible design patterns including EJB 1.1,
EJB 2.0 and Gang of Four (23 patterns).The article 'Designing Patterns With UML' at http://developers.sun.com/jsenterprise/nb_enterprise_pack/reference/techart/uml_patterns.html is for a slightly older version but should still apply.
EJB code generation is not currently supported but is on the roadmap:
http://wiki.netbeans.org/wiki/view/UMLRoadmap

Manual EJB BC4J Deployment

Quick question.
Is manual BC4J deployment to an EJB supported?

Deployment instructions are completely documented in the online help:
User Guides
Developing Business Components
Deploying Business Components
For the client:
User Guides
Developing Applications
Developing Java Forms for Business Components
Deploying Java Forms

CAn EJB do persistance without hibernate?

Hai All.....
My doubt is that 'Can EJB do persistance without hibernate or any other tools'?
Can EJB do persistance alone??
Please Help

EJB 3, and JPA are just specification, not implementation. EJB 3 alone cannot do anything, it is just interfaces. Any product that implements the EJB 3 spec will support EJB SessionBeans and JPA and persistence.
Any JEE 5 server will support EJB 3 and JPA persistence (WebLogic, OC4J, Glassfish, JBoss, WebSphere, etc...). Each server uses a different product to support JPA, (Glassfish v2 uses TopLink Essentials, OC4J 11g uses TopLink, WebLogic uses Kodo, JBoss uses Hibernate, Glassfish v3 uses EclipseLink, etc.). Technically if you are using JEE 5, you don't need to worry about what JPA product you are using and can consider that EJB supports persistence, but more than likely you will need to know you JPA provider in more intimacy.
You will also need a database to persist to. Again most JEE server bundle a database, but most production applications prefer to choose their own database.
The JPA part of EJB also works outside of JEE, in this case you will need to choose one of the many JPA products.
see,
[http://en.wikibooks.org/wiki/Java_Persistence/What_is_JPA%3F|http://en.wikibooks.org/wiki/Java_Persistence/What_is_JPA%3F]
-- James : [http://www.eclipselink.org|http://www.eclipselink.org]

EAR + EJB + Spring Class-Path problem

Hi,
I'd been using JDeveloper for a few years, but this is the firstime I package an EJB application. I have two jars (the ejb.jar and api.jar) both are using the Spring 2.0 Library that JDeveloper provides.... but when I package the EJB as an EAR everything seems to be OK:
-ear
- META-INF
- application.xml
- ejb.ar
- api.jar
- spring.jar
But when I try to publish the EAR in the OC4J standalone management console, this error is thrown:
oracle.classloader.util.AnnotatedNoClassDefFoundError: Class not found: org.springframework.ejb.support.AbstractStatelessSessionBean. Dependent Class sv.com.sti.ebs.sgd.ejb.SgdTrxSessionBean
Cargador: sgd-ear.root:0.0.1
(Failure analysis caught java.lang.NullPointerException)
So I Think the ejb is not using the spring libraries located in the EAR's root or maybe I have to add the classes to the ejb's manifest.....But JDeveloper ejb jar deployment doesn't add any entries in the Manifest Class-Path entry....
Please Help.

Hi
Try putting the utility classes in an EJB JAR file, then putting a Class-Path attribute in the MANIFEST.MF for that JAR far. That is
Class-Path: lib/myutils.jar
It doesn't matter where you put the utility JAR, so long as it's somewhere in the EJB JAR and you specify it in Class-Path. This should make the utility classes accessible to servlets as well. Note that classes defined in a WAR file's ./lib directory willl not be accessible to EJBs, as a matter of policy.
Best wishes
Kevin

EJB Impressions?

Hi all,
I was hoping to get some feedback from you guys regarding the usefulness of EJB's in J2EE applications. I am currently researching this topic for a class I am taking. I've been reading the J2EE Tutorial, and all the relevant sections, as well as running the examples, and I think I'm getting a pretty good overview of how they work.
However, I have never actually used EJB's in a real world application. I only have some experience with JSP, servlets and JDBC. I was hoping some of you might provide me with your real-world EJB experiences/impressions. What are the pros, cons? What are the scenarios in which you would want to use them, and when (if ever) would you avoid using them?
Thanks a lot in advance.
Samantha

Pro: It's good to use EJBs when you are building a networked application with multiple computers. Using J2EE and EJBs gets the app online much sooner, and keeps it scalable.
Con: If your app is going to stay within the capacity of a single server EJBs could be overkill
Pro: J2EE (EJBs) supports communications between systems by different manufacturers
Con: If all your app components come from the same vendor, you may not need this capability
Pro: An EJB container can enforce security restrictions on access to data based on user types.
Con: If your app doesn't deal with sensitive data - or you have other options for security you might not want an EJB
Pro: EJBs can provide for storing and restoring of the vital data of an EJB object - which makes it appear that the object is always available.
Con: Other options could be an OO database.
Pro: As the J2EE standard becomes more accepted there are more companies that are creating toolkits that simplify interfacing and creating EJB components
Con: The functionality that you need might be available off the shelf - but at a high cost.
Pro: An EJB container can provide management of transactions so that equipment failure can not corrupt a database.
Con: If your app doesn't involve database transactions - or your transactions aren't critical - you may not need this capability
Overall Experience:
I've used EJBs for working with communications and databasing with sensitive information. Other methods don't provide the security - or guaranteed data quality. EJBs can be used among several applications that are needing the same functionality - including security.
So, for security and data integrity EJBs are often the way to go.

How to create the simple EJB Applications.

Hi
I have asked about the what are the necessary softwares required for creating the Simple EJB Applications.
I have
Jdk 1.6,
Netbeans 5.5,
J2EE5 ,
Apache Tomcat 5.5
what are other necessary softwares?please tell me From where i get the source code samples?
Please Tell me it is necessary for me..

Hi U,
Tomcat is only JSP/Servlet container -- no EJB support.
Easiest is to download the Netbeans 6.1 bundle including Glassfish and JavaDB, thats all you need + JDK and Java EE of course.
Glassfish has both web/JSP/Servlet-container and EJB-container, so Tomcat is not needed then.
( If for some reason you really want to use Tomcat, you can use it together with OpenEJB for example, to add EJB-support. )

EJB support

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