JavaBeans and EJB Difference

Hi Experts:
Can anyone tell me DIFFERENCE between JAVABEANS and ENTERPRISE JAVABEANS? I am a newbie to JavaBean world. How do we know which one to use when?
Also, any startup BASIC TUTORIAL Link would be appreciated.
Thanks!

A javabean is simply a class that, through established conventions, exposes certain elements as standard properties. See http://developer.java.sun.com/developer/onlineTraining/Beans/beans01/ and http://developer.java.sun.com/developer/onlineTraining/Beans/beans02/ for a tutorial. Javabeans are a common part of most java programming.
An enterprise java bean (EJB) is a heavyweight, transactional, remotable component running in a managed "container." EJB has little or nothing to do with regular javabeans. Use EJBs to build web applications and web services with steep scalability, failover and transactional requirements. See http://www2.theserverside.com/books/masteringEJB/index.jsp for a lengthy and comprehensive tutorial.

Similar Messages

Javabeans and EJB

hi
I am new to EJB and i have not worked on javabeans...
My question is very basic... what is the difference between javabeans and EJB other than EJB running on a container and javabeans in jvm?
Thanks for your help

That's it in a nutshell, isn't it? EJBs require a J2EE container, and JavaBeans are components that follow the JavaBeans spec and run in a JVM.
But think about all that the "container" means and all the services it provides. That's all the difference in the world.
%

What is relationship between javabeans and Ejb ?

I am new to javabeans and Ejb .
thanks in advance.
zzl_hz_cn

nada. null. nil. void. zero. zilch.

What is the diffrence between a javabean and EJB

hi!
what is the diffrence between a javabean and entreprise jvaabeans! i mean which are the uitilization featires of eaxh one !

i am seeking for a solution for my problem , in fact i ma trying to implement and develop an application with java that allows a certain range of IP adresses to be connected to a database server in order to extract the suitable data from the server .
let me explain mor ethe suitation , in fact what i am loking for is to use javabeans to grant my application much more consistence and pertinence : si i am asking if it could be possible to use javabeans in my case especially if i am not trying to developp a web application but a cleint /server one allowing some services.
The application is in fact dealing with a stock exchange market and what i am trying to do is to grant particilar registrated customers to have the informations that they need ( portofolio, currency's status, market indicators, .) also drawing some charts decribing rates, variations, and others specefic financial caracterestics .So , if we consider that this application is not a web application ( no HTTP request and no servers like apache or others ) how it is possible to use javabeans and not EJB to build the application? i mean what could be suitable and preferable to rely on and dvelop to ensure a good java application !!
if you need more details to help you find the answer for me don't hesitate to answer me back !!
Someone here gave me that answer
use RMI to code the services and (Updateable) Value Objects to pass the information between tiers.
RMI is an all-java distributed component framework (ie. EJB, CORBA, DCE/RPC, DCOM, etc.), that is very suitable for developing non-containerized multi-tier applications. Refer to the RMI trail in the Java Tutorial as a starting point for coding RMI solutions (http://java.sun.com/docs/books/tutorial/index.html). Under this scenario you would code the database access service as an RMI service (server-side). Client/server communication should be facilitated through the use of JavaBeans/classes that wrap the information being passed (customer information, portfolio details, market information, etc.) - these are refered to as 'Updateable Value Objects' (a design pattern). Graphing and charting would be handled in your client from the information received from the (RMI) server. GUI JavaBeans can be used to provide this functionality as well as other client-side services. There are numerous "shrink-wrapped" components for GUIs available on the market just peruse any Java magazine to find them.
but how comes? how can i do it !! and where can i find more information please about 'Updateable Value Object "
thanks

What is the difference of using JavaBean and regular classes?

Experts,
I am new to JavaBean(not EJB), and wondering what is the difference of using JavaBean for JSP page compared with using regular Java class?
I know there are Bean tags which save some lines, what else?
What does "serialization" mean compared with "not serializable"?
thanks very much.

No.
A JavaBean is a regular JavaClass that:
1) implements java.io.Serializable
2) Its data members are private, and its data is accessed via getters and setters. You must define the getters and setters. Getters retrive the property, and must be in the format:
public PropertyType getPropertyName()
for most cases. The exception is when the PropertyType is a boolean, in which case you use:
public boolean isPropertyName()
Setters assign values to the property, and are in the form:
public void setPropertyName(PropertyType propValue)
3) There is also a PropertyChangeEvent model that needs to be followed.
A marker interface has no methods you need to implement. It just marks the class as supporting certain operations. In the case of Serializable, it means the class can be written to be an ObjectOutputStream for persistant storage.
As far as an example of JavaBean persistance, take a search on the java.sun.com site for Serializeable
Also, take a look at this: http://java.sun.com/developer/onlineTraining/Beans/beans02/
It concentrates mainly on gui component beans, but not all beans need to be gui parts... There are other pages to look at, but I can't find them at the moment, and I have to run...

Difference between simple beans and EJB

Anybody knows... the difference between the simple beans and EJB... Pls share with all. thanks a lot.

The Verrrrrrrrry short scoop is that JavaBeans pretty much just adhere to a standard format, mostly getters and setters. EJBs work only within a specific framework - an EJB container, and have access to J2EE support. For a detailed look at EJBs, see my tutorial Getting Started with Enterprise JavaBeans Technology at the developerWorks Java zone:
http://www-106.ibm.com/developerworks/edu/j-dw-java-gsejb-i.html
Joe Sam
Joe Sam Shirah - http://www.conceptgo.com
conceptGO - Consulting/Development/Outsourcing
Java Filter Forum: http://www.ibm.com/developerworks/java/
Just the JDBC FAQs: http://www.jguru.com/faq/JDBC
Going International? http://www.jguru.com/faq/I18N
Que Java400? http://www.jguru.com/faq/Java400

Difference between business components and EJB

hello guys, do anyone knows what is the core difference of using ADF Business components and EJB Session Beans ??

this blog might help http://blog.whitehorses.nl/2012/03/26/adf-11g-bc4j-or-ejb3/
Timo

What is the difference between ejb reference and ejb handle?

Hi:
I am newbie for J2EE.
I want to know what is the difference between ejb reference and ejb handle
from the client view and from the container view?
Very Thanks!
Stive

Hi John,,
1) Ejb Object Handle are nothing but a long lived proxy for the
ejb object, using this handle user can disconnect from the Ejb Server/Container
at any time
and after some time using the same handle he can able to resume the conversational
state
with the server / container where he was been disconnected From.
And there are currently two Handles , HomeHandle and Handle for EjbHomeObject
and EjbObject
Respectively. Both these handles have Persistent reference to the EJB Object
2) Ejb Reference is used to lookup a bean from other Enterprise Bean
Ejb reference is a nickname for the JNDI Location that you want to lookup a bean.
your code will looks up a Home object via using this nickname
and the deployer will bind the
nickname to the JNDI location of its choice
EJb Reference are declared in the deployment descriptor
Regards
Karthikeyan Gangadharan
SIP Technologies, Chennai
E-mail-ID : [email protected]
"John Stive" <[email protected]> wrote:
>
Hi:
I am newbie for J2EE.
I want to know what is the difference between ejb reference and ejb
handle
from the client view and from the container view?
Very Thanks!
Stive

Beans & EJB - difference?

What is the difference (if any) between Java Beans and EJB, is the latter a mere extension of the former? I've heard that EJBs dont have much in common with Java Beans. is it so?
Thanks in advance

Hi,
You're right. There does not appear to be a lot of similarities. A straight javabean is really a class that has get and set methods. eg. getName() and setName().
Whereas an EJB has lots of different types.
Firstly, you have a choice of session beans and entity beans - the former could be identified as a client bean e,g, a [person] in the simplistic view; whereas an entity bean could be a database record/s relating to a query. This latter type can have persistence(session control) that is handled by a bean or handled by the server itself.
This is a simplistic approach, and you need to read a few tutorials and books to avoid all the wrong information that I am probably giving to you.
The other important difference is that an EJB cannot be directly implemented by a client interface. this means that there has to always be a specific correlation between a home and remote call through an instance of an enterprise java bean.
If you study a few simple examples of EJB, this will become apparently clear. There appears to be a standard way of writing simple EJBs which endorse this approach.
Good reading material is the tutorials that go with the J2EE documentation and also Java Server Pages - J2EE edition by Wrox Press. Also, www.theserverside.com holds an important source of info as do many of the SUN tutorials.
They all explain it a lot better than I do.
best kev

Diff b/w bc4j model and ejb model in adf11g

hi all,
iam murali iam new for adf 11g i have some dout's in adf11g ,can u please solve my probleam
what is the difference b/w bc4j componet and ejb componet,how to develop ejb application in adf11g.

,how to develop ejb application in adf11gTake a look at this tutorial for starters:
http://st-curriculum.oracle.com/obe/jdev/obe11jdev/ps1/ejb/ejb.html

What is a javabean and how to compose it?

Q1:although have used many java class in jsp within tomcat, but i don't is it a standard javabean. I mean is any java class can be an javabean, or what is the different between javabean and java class.
for now i found some problem with 'javabean' used in jsp.
Q2:what is ther difference between use jsp:setProperty,jsp:getProperty and direct give value like 'myBean.variable=100'?
thanks!

javabeans are standard classes but have :
- default constructor
- getter and setter methods
javabean can be used on custom tags, so no code on your jsp !
why don't directly use attributes ?
look this thread :
http://forum.java.sun.com/thread.jsp?forum=45&thread=314643
this is one, but it's not the only, reason.
Regards.

ADF and EJB. Why so little samples / information

Hi All,
I was wondering if other JDev / ADF developers have the same feeling as me in regards to ADF / EJB.
There is barely enough information and examples on using ADF with EJB. Seems that most examples and blogs are related to BC instead.
I was reading an article (sorry, don't have the link to it) not long ago that an Oracle Executive was asked if BC or EJB was Oracle's future and EJB was the answer. However, that doesn't seem to be the what most blogs and sample are about.
I know that BC has tight integration with ADF, but it's not a standards based back-end framework. We are locked in the ADF UI for all of our development, but not touching BC at all. All code is EJB compliant.
So, my request is:
- comments? do other developers out there feel the same way?
- bloggers, the great articles from "Frank Nimphius" and "Andrejus Baranovskis", not to mention others, can you guys post a little more on using ADF with EJB?
BTW: great article on that "http://www.oracle.com/technology/products/jdev/tips/fnimphius/ControlHintsWithPojos/controlHintsWithPojos.html" (How-to find and set control hints on POJO entities in bean Data Controls)
Thanks and Regards
Jonny Oenning

Hi!
I rised this issue long time ago - with TP3 I noticed regression in EJB/JPA support with ADFm (binding layer as referred by Shay). Following the development, I draw this conclusions:
1. Oracle is oriented toward J2EE standards, including the strategic orientation to EJB/JPA. The team that managed JDev 11g initial development phases was oriented toward EJB (but was replaced/fired sometime between TP2 and TP3).
2. Oracle decided that FMW 11g stack products as well as EBS migration from PL/SQL to EJB is not feasible in short time frame (I think that was poor judgment). So, the BCs got the push over the EJB and TP3/4 was biased toward BCs. Even the default Fusion technology stack is changed - in TP1/2 the Fusion Web project was ADF RC + EJB buy default and then changed to ADF RC + BC4J. Also the development guides were "rephrased".
3. As BC4J are proprietary Oracle technology, the are lacking many J2EE standard features and many strong points of the modern multi-tier architecture. Many developers are witnessing the performance / scalability issues as the BC4J are basically a mutant: they are SQL based concept wrapped into EJB for deployment! But they are not relaying on proven scalable J2EE technologies (like JPA/JTA, object caching etc.). They are trying to reinvent the wheel, decalratively offering the heaven of J2EE multi-tear architecture to old fashion SQL-focused architects/developers. But it is just a marketing - the truth is that BC4J are not and cannot be the replacement for proven J2EE architecture. They are trying to mimic the concepts of J2EE (like object-entity mapping, like JTA/JPA, like scalability and caching, transparent web-services exposition etc.) but they are lagging behind even J2EE 1.4 and we are facing the J2EE 6 in few months!
4. Oracle is aware that EJB is the future but they are trying to bridge the gap between their legacy code written mainly in PL/SQL. So they developed and they are developing the JDeveloper 11g in fashin that should support and serve for their primary goals - migration of their own old PL/SQL based products to new, J2EE, world (of BEA!).
So, anyone who is expecting the that Oracle JDeveloper is what they are marketing (full scale J2EE IDE) - is going to waste some time and money waiting the Oracle to finish it's half-way migration from PL/QL and Forms/Reports to PL/SQL + ADF RC! In few years from now.
Thus, if you need efficiency in J2EE standards development - try something else than JDeveloper. Or, as suggested by Shay, don't use overmarketed ADFm as it is not compatible with EJBs in scalable / clustered deployment! Yes, that is proven issue (but I wont elaborate here as it is already well elaborated in this forum in another tread but the Oracle guys wisely neglected that issue).
And beside few very very old and for me useless blog entries (one of which is not working in 11g as you may read in comments) there will be no much support for EJBs in this release of JDeveloper - I can bet!
But, as final message to the public, I'm still stuck with JDev and EJBs as. When you develop you own patterns, it is still the best combination for developing the scalable, high performance apps on Oracle FMW 11g platform - mandatory including several grid technologies that are making the difference in scalability of true J2EE apps and quasi-J2EE "Fusion" apps based on BC4Js "silently" wrapped in EJBs for deployment.
Regards,
PaKo

JavaBeans in EJB App

In which circumstances to use JavaBeans in Ejb application?
I have created a simple e-commerce application using EJB components but without JavaBeans at all.
The thing is that i have a problem with the jsp page which presents all the products under a particular category, (each product has a link to add it to the shopping cart of the user).
After the user select a category, a servlet getting the products list from a session ejb and put the result as an attribute in the request. Then i'm prining all the products - till here no problem.
In order to add a product to the shopping cart i'm sending to a servlet some info about the product , but this info sometimes contains a special characters , so i decided to use <c:url> with <c:param> for the attributes.
     <%
      java.util.List<Entity.Products> products=(java.util.List<Entity.Products>)request.getAttribute("products");
       for(Entity.Products product : products)
        %>
<c:url value="ShoppingCartServlet" var="productUrl">
      <c:param name="productId" value="" />
      <c:param name="productName" value=""/>
</c:url>
<A href="${productUrl}">Add</A>now how can i set the values of the params?
i can't use scripting elements (<%=%>) , it is not allowed.
Do i need to use JavaBeans?
Thanks in advanced.

is it so hard? Looky here:
; hostname: 127.0.0.1; port: 3820"The application is trying to connect to the localhost, and the glassfish server is not running on the localhost. The JNDI properties of the application must point to the actual host that the glassfish server is running on.

JDO 2 and EJB 3

I saw the letter posted on JavaLobby
(http://www.javalobby.org/thread.jspa?forumID=61&threadID=14630&start=0&mode=flat)
about the JDO and EJB working groups working together and think that's
great. I think a unified persistence API will be a huge win for the Java
community.
Here is my question/comment to the Solarmetric people on the JDO board:
What is the impact this has on JDO 2.0 and it's timeline? With Kodo 3.2.0
being on RC2 and having JDO 2.0 "preview" features, I had been hoping that
JDO 2.0 was going to be released soon. If JDO 2.0 is going to have to be
re-worked to work with (or be?) the EJB 3.0 persistence system, I would
assume that it will be a lengthy process and will have to push back the
release of JDO 2.0. After all, there are large differences between the way
the two specs handle persistence, and even with the new-found sence of
friendship, there is likely to be grounds for arguement.
The problem with pushing back the JDO 2.0 release, is that it increases the
amount of time that users of JDO have to choose between the 1.0 spec or
using "preview" releases of 2.0 which SEEM to follow a spec, but really
leads to vendor lock-in. If we use the JDO 2.0 features in Kodo 3.2.0, we
have to stay with Kodo since no other vendor supports their particular
version of the preview spec, and who knows if the post-EJB actual JDO 2.0
spec will differ significantly enough that Kodo will be forced to keep the
old "preview" 2.0 features simply as vendor-specific APIs. If we aren't
coding to a standard, why not just use Hibernate?
I would suggest considering how the unified persistence framework will
impact JDO, then make educated guesses as to how the JDO and EJB will come
together in order to make nessisary changes to the JDO 2.0 spec that will
help--but not significantly impact the JDO 2.0 timeline. Then, create a new
JSR for JDO 3.0 which will be able to work within the timeframe of the
EJB/J2EE spec timeframe. An added bonus would be the fact that EJB and JDO
would have the same version numbers which may help some people's confusion
(any little bit helps)
Thanks,
Nathan

Hi everybody,
I'm glad to hear some more pessimistic comments on TSS about the new plans
of SUN and the future of JDO/EJB.
My opinion about the "evolution" of persistence I have already mentioned
here:
http://theserverside.com/news/thread.tss?thread_id=28995#139908
http://theserverside.com/news/thread.tss?thread_id=28995#139903
I must admit that when KODO 3.2.0 RC2 was released I was a little bit
confused and suspicious about the new "Single String JDOQL".
The new syntax reminded me on the syntax of HQL and EJBQL.
I think that was a sign ...
If you compare the drafts of EJB 3.0 and JDO2 there were many common
concepts. But I think JDO2 has really more features which help you to
optimize the database access in the domain layer.
So the only think I wanted to know in which direction will the new JSR 220
go and will it support all the features of JDO2.
I think it can't since the new persistence will be part of J2SE and also
the new JSR is lead by the EJB lobby.
And especially I'm interested in how KODO will look like. KODO is very
good product with a plenty of features.
But how will KODO look like in 2 years. Which API's will be supported ?.
And how will an enterprise O/R mapping tool like KODO with support of
distributed cache,... fit in the new persistence API that will be part of
J2SE. Or will two version exists, one for J2SE and one for J2EE.
So think of a big project in which you have to realize a big domain layer.
Which persistence technology/API should you use in the next two years ?
I'm looking forward to the Q & A and hope that they will make everything
clearer ?
Thanks,
Matthias
Alex Roytman wrote:
Hi Patrick,
Any comments?
http://theserverside.com/news/thread.tss?thread_id=28995#139905
http://theserverside.com/news/thread.tss?thread_id=28995#139908
http://theserverside.com/news/thread.tss?thread_id=28995#139912
Thanks
Alex
"Patrick Linskey" <[email protected]> wrote in message
news:[email protected]...
Alex Roytman wrote:
If I understood Sun announcment, there will be no JDO2 - just maintenance
for JDO1 and some JDQL enhancements. So whatever JDO2 features are
implemented by vendors might be a dead-end since evolution of JDO2 is
not in plansSun's press announcements to date (or at least, as of five hours ago) were
relatively vague. According to my knowledge, JDO2 will continue pretty
much as planned, except that the JDO2 team will work on ensuring that a
few pieces of the JDO2 puzzle can be easily reused by the new team working
under the auspices of JSR220 as well.
Hopefully, Sun's FAQ will make these issues clear. Sun had intended to
release the FAQ today along with the announcement, but things got delayed,
basically for logistical reasons from what I understand.
-Patrick

Rmi and EJB

Hi guys,
i feel ejb is internally using rmi.Am i right?what are the differences between rmi and ejb and also what r the similarities?
Thanks
Regards
Vivek.S

RMI is just an API that allows Java classes to be invoked remotely. It uses Java Remote Method Protocol. But it also can use IIOP in which case this whole thing is called RMI-IIOP.
RMI doesnt provide any component model like EJB, that has several types of components with well defined behavior and purpose.
Since EJB's can be called remotely they may use JRMP but it's not mandatory.
EJB's have to use IIOP as a connection protocol to ensure interoperability among EJB servers and CORBA ORB's. So EJB' s use RMI as an API, but they have to support IIOP and optionally some other protocols like JRMP. For example, WebLogic supports some interesting protocol called T3.
best regards,
Maris Orbidans
SCJP SCWCD SCBCD

JavaBeans and EJB Difference

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