Why there are overloaded create methods in Statful bean?

Hi all,
I have a question ...!
Why there are overloaded create methods for Statefule beans? and why not for Stateless bean?
because any way these create methods are for giving referneces of EJB objects.hence, what is use of overloaded methods in stateful bean?
Thanks in advance.
Regards,
Rahul

Hi Rahul,
Each stateful session bean is tied to a particular client. That means whatever state is passed in during create() is guaranteed
to be available on subsequent invocations. Allowing multiple create methods is a convenience.
For stateless session beans there is no prescribed relationship between the caller and which bean instance is used to handle
an invocation. It wouldn't make sense to allow creation parameters since there would be no guarantee that a subsequent
invocation is handled by an instance containing that particular initialization state.
All of this only applies to the EJB 2.1 and earlier API. Starting in EJB 3.0, there are no longer explicit create() methods.
As you've seen there isn't any benefit to having them in the stateless case. For stateful session beans in EJB 3.0, the
developer can perform initialization by just declaring a particular business method and calling that after first acquiring a
new stateful session bean reference.
--ken                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

Similar Messages

  • Why there are two init methods?

    I copied this code from netbeans for a JApplet.. and it has two init methods
    One is public void init() that calls another initComponents() method.
    And the initComponents() method has all the components defined in it, and it is private.
    I replaced private with public and changed initComponents to init, and then deleted all the init method, it worked that way.
    But why there two methods when you can put every thing in single init() method?
    The init() method has this code in it:
    public void init() {
            try {
                java.awt.EventQueue.invokeAndWait(new Runnable() {
                    public void run() {
                        initComponents();
            } catch (Exception ex) {
                ex.printStackTrace();
        }

    BDLH:
    WWJD? Probably code in Ruby, but I digress. No, he would define an abstract base for that boilerplate code:
    import java.awt.*;
    import java.lang.reflect.*;
    import javax.swing.*;
    public abstract class AbstractApplet extends JApplet {
         public void init() {
              try {
                   EventQueue.invokeAndWait(new Runnable() {
                        public void run() {
                             initComponents();
              } catch (InterruptedException ex) {
                   ex.printStackTrace();
              } catch (InvocationTargetException ex) {
                   ex.printStackTrace();
         protected abstract void initComponents();
         //ditto: start, stop, distroy
    }

  • Why there are no choices of none in payment info?

    In payment info why there are only 3choices visa, mastercard, and amex? what if i already don't have a credit card. How can i choose none if  it is not in the choices? I cannot download free games because need to verify my credit card account. Which i already don't have it. Pls help.

    You can create an iTune and App Store account without credit card details
    1. Sign out of current Apple ID if you are sign-in to one (important)
    2. Go to App Store and select a free app
    3. Tap INSTALL APP
    4. Create New Apple ID
    5. Confirm Your Country
    6. Agree with Terms and Conditions
    7. Fill in your Apple ID and Password (you must create a new Apple ID; don't use your old Apple ID)
    8. Create and answer your secret question
    9. Select NONE for Payment Method
    10. Fill in Billing Address
    11. Submit application for new Apple ID
    12. Wait for verification email
    13. When email arrive, verify your account
    14. Start downloading your free apps

  • Why there are differences in error table definitions?

    Why there are differences in error table definitions?
    We are using OWB repository 10.2.0.3.0 and OWB client 10.2.0.3.33. The Oracle version is 10 G (10.2.0.3.0). OWB is installed on Linux.
    I created a error table using DBMS_ERRLOG.CREATE_ERROR_LOG in databse.
    Here is the layout.
    =========
    ORA_ERR_NUMBER$
    ORA_ERR_MESG$
    ORA_ERR_ROWID$
    ORA_ERR_OPTYP$
    ORA_ERR_TAG$
    PROJECT_ID
    DESCRIPTION
    PROJECT_TYPE
    CREATION_DATE
    ===========
    I imported the table metadata into OWB. As I used the table in mapping using table operator, I am not able to see ERR group in table object of mapping.
    How do we bring manually created error table metadata into OWB? Is it feasible?
    I specified data rule/shadow table for imported table using object editor. I deployed the table via CC.
    Here is the layout from deployed ERROR table from DB
    +++++++++++++
    ORA_ERR_NUMBER$
    ORA_ERR_MESG$
    ORA_ERR_ROWID$
    ORA_ERR_OPTYP$
    ORA_ERR_TAG$
    ERR$$$_AUDIT_RUN_ID
    ERR$$$_AUDIT_DETAIL_ID
    ERR$$$_ERROR_ID
    ERR$$$_ERROR_REASON
    ERR$$$_SEVERITY
    ERR$$$_OPERATOR_NAME
    ERR$$$_ERROR_OBJECT_NAME
    PROJECT_ID
    DESCRIPTION
    PROJECT_TYPE
    CREATION_DATE
    ++++++++++++
    Why there are differences in error table definitions?
    As I used the table in mapping using table operator, I am not able to see ORA_ERR_NUMBER$ , ORA_ERR_MESG$ , ORA_ERR_ROWID$ , ORA_ERR_OPTYP$ , ORA_ERR_TAG$ in ERR group in table object of mapping.
    Are there any additional steps/process?
    Any idea ?
    Thanks in advance.
    RI

    There are columns for data rule errors (logical errors) and DML errors (physical errors), I think you probably have data rules on the table..?
    To process DML errors you will have to add the error table into a map you may have to reverse engineer it). The error group behavior is only available for processing errors from tables with data rules. Ensure your table operator is synchronized with your design table.
    http://blogs.oracle.com/warehousebuilder/newsItems/viewFullItem$184
    Cheers
    David

  • Why there are no layout in number 3.0 ????????

    why there are no layout in number 3.0 ????????
    I need to export the number file to PDF file , I don't want all of the pages are together , I need to seperate the pages in PDF file , I need the PDF file with layout function , just like previous version .
    why are this useful function missing in new version ????????????????????????????????????????????????????????????

    All we know here is that the new version of Numbers is significantly different than the old version of Numbers. We didn't write the specifucation nor do we know what the objectives were for the redesign, other than Apple's stated desire to make the three platform versions of Numbers as compatible as possible across platforms. That's the best "why" we can give you.
    Thanks for using only one exclamation point in your last post.
    Jerry

  • Why there are N169.3 things when i right click my desktop ?

    i think my macbook pro is having an error. this morning, when i right click on my desktop and then there are "new folder", "get info", "change desktop background", "N169.3", "N148", "N35". Why there are those N-number words? and also I can't open some of the applications that i downloaded before. do anyone knows why?

    yeah i am having the same problem!!!!!!! its really annoying just done a software update and its done nothig either!
    sounds like we arent the only tho.
    might be just one of thos glitches in the software that has activated at a certain time!
    im running snow leopard?
    also my skype has been down for about a week now wont let me open it at all so messed up.
    i hope they read this and fix it soon

  • Does anyone know why there are no football apps for the iPhone for 2011

    does anyone know why there are no football apprs for the iphone for 2011
    I had apps last year for NFL schedules and also for college
    can't find even one this year
    anybody know

    If this is true, then it is because no one is making these apps.
    Why else would it be?

  • I bought a new ipad3 packed but after opening its box there are no headsets in it and iphone headsets wont work with iphone so is it normal I mean why there are no heas sets with ipad3 ?

    I bought a new ipad3 packed but after opening its box there are no headsets in it and iphone headsets wont work with iphone so is it normal I mean why there are no heas sets with ipad3 ?

    Headsets don't come with the iPad. All you get is the iPad, USB cable and wall charger.
    Since you're new to iPad ...
    You can download a complete iPad User Guide here: http://manuals.info.apple.com/en/ipad_user_guide.pdf
    Also, Good Instructions http://www.tcgeeks.com/how-to-use-ipad-2/
    Apple - iPad - Guided Tours
    http://www.apple.com/ipad/videos/
    Watch the videos see all the amazing iPad apps in action. Learn how to use FaceTime, Mail, Safari, Videos, Maps, iBooks, App Store, and more.
    How to - Articles & User Guides & Tutorials
    http://www.iphone-mac.com/index.php/Index/howto/id/4/type/select
    iPad How-Tos  http://ipod.about.com/lr/ipad_how-tos/903396/1/
    You can download this guide to your iPad.
    iPad User Guide for iOS 5
    http://itunes.apple.com/us/book/ipad-user-guide-for-ios-5/id470308101?mt=11
     Cheers, Tom

  • Why there are big differences in the prices of spare parts (hinge) ..?? particular egypt ibm

    I have Lenovo 3000 N200 0769 with problem in left hinge lcd , the number of it i think (41W5214) 15.4 lcd.
    lenove egypt (IBM) was told to me cost 100 $ but in Many sites (hinge) cost betwen 19 $ , 30$ , 80 $
    i want to understand why there are a big difference betwen prices , and why the ibm egypt is  Highest price...!!!
    i was asked  ibm egypt can replace (Repair) it , if I bought one by my self from internet , but refuse my Request and told to me you must bought it from egypt ibm !!!
    thank you 

    it`s hinge!!!! just Metal hinge !!??
    not hardware like ram or H.d or vga.....etc
    original or not it`s nothing important like other hardware must be original
    if you see the hinge pic (41W5214) you will know what i mean about 80$ differences in the prices
    and
    why lenovo Egypt refuse my Request to replace (Repair) it , if I bought one by my self ??
    the answer is Forced to purchase an Expensive one from lenovo Egypt "kind of business" and customers not important to agree or disagree
    I hope Lenovo tighten the control of the Egypt Branch, with some simplification
    Message Edited by sadzaglol on 03-07-2009 06:40 AM
     I hope Lenovo tighten the control of the Egypt Branch, with some simplification
    Message Edited by sadzaglol on 03-07-2009 06:41 AM

  • Why there are no books for sale in iBooks?

    Hej,
    I just want to ask everyone why there are no books for sale in iBooks in Sweden. I mean this is really disappointing because I want to buy and read new books and there are no books for sale. If anyone has an answer to my query please reply. Thank you

    It's unfortunately an issue of sorting out all of the legalities for apple to sell books in your country and unfortunately haven't been able to do that for Sweeden as of yet. And so your iBooks store will only have the out of copyright (or free) books available for download. I can only assume apple is working to bring the bookstore to more countries, if you really need books you can make iTunes account for a different country but to do so you would need either a credit card or an iTunes gift card from that country.
    Otherwise hold tight till they open they iBook store in your country

  • There are two CDC methods - Source based CDC and Target based CDC which one

    There are two CDC methods - Source based CDC and Target based CDC, which one is better performancewise. in data services.
    If there is any document available which compares both and provides any info on performance etc, will be helpful.
    thank you for the helpful info.

    LIke Suneer mentioned CDC is for better performance.
    Following link would be helpful.
    http://wiki.sdn.sap.com/wiki/display/BOBJ/Extractors-Source-Based+CDC
    http://wiki.sdn.sap.com/wiki/display/BOBJ/Extractors-Target-Based+CDC
    Thanks,
    Arun

  • Why there are two IMG steps provided for Home Page configuration?

    Dear experts,
    I wonder why there are two IMG steps provided for configuring ESS home page.
    1. Cross Application Components --> Employee Self Service --> General Settings
    2. Personnel Management --> Employee Self-Service --> General Settings
    Both tables contents are also similar.
    Why SAP has provided same configuration steps in two areas?

    Your first one is wrong. It is under Cross App. Components but not in an ESS node....I am sure it is a typo on your part. Anyways......
    It's NOT two steps. It's just the same configuration in two places. It makes it easier to locate for instance if you are in ESS to just have it there. BUT the Homepage Framework is used elsewhere (MSS for example) as well as you can use it for whatever else you like (building an easier interface for other things) therefore, it has it's "true" place up as a "cross application component".
    This is very similar to say Benefits. If you look under the Benefits config area in the IMG, you will actually see a lot of ESS settings there that are the exact same ones you see under the ESS node too.
    Don't let it confuse you.

  • If there are two synchronized methods in one class.

    If there are two synchronized methods in one class then what will be the beheviour of the threads accessing the methods.

    Synchronization is on objects, not methods or classes. A thread, entering a synchronized method, synchronizes on the object on which that method is called. Another thread, attempting to synchronize on that object, will be made to wait until the first thread releases it.

  • Why there are restrictions on EJB, but not on Servlet?

    Hi,
    There are some restrictions on EJB, for example,
    * use the java.lang.reflect Java Reflection API to access information.
    * listen on, accept connections on, or multicast from a network socket
    * define a class in a package
    But I can not find similar restrictions for Servlet. Why?

    I understand why there are restrictions for EJB, for example:
    * For security: it does not allow "java.lang.reflect Java Reflection API"
    * For thread management: user thread in not allowed.
    * For portability from machine to machine: file system access is not allowed.
    The same issues exist for servlet. But no restrictions.

  • Why objects are  dynamically created in java

    Why objects are dynamically created in java even if dynamically created object requires more space & more memory references as compared to static object?

    I don't even know where to start...
    KAMAL.MUKI wrote:
    Why objects are dynamically created in javaWhat is the alternative?
    even if dynamically created object requires more space & more memory referencesCan you prove that?
    as compared to static object?Can you define "static object"?
    I vote "troll".

Maybe you are looking for