jananianandan

 Profile Answers by jananianandan Questions by jananianandan

• Feb 20th, 2007

design patterns codify and provide developers with a way to recognize common useful techniques.with design patterns , it's important to understand the types of situation that each pattern addresse...

Cos

 Profile Answers by Cos Questions by Cos

• Oct 28th, 2005

A design pattern describes a recurring desing problem and a core solution to it. A design pattern has 4 essential elements: a name, the problem, the solution and consequences. Design patterns can be grouped in 3 major categories: creational, structural, and behavioural.

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harish.verma

 Profile Answers by harish.verma Questions by harish.verma

• Mar 6th, 2007

If objects that are not serializable, it can't be passed as input parameter of remote methods. It should throw runtime error.

keshab

• Dec 13th, 2006

Runtime Error

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tamil Selvan

• Mar 16th, 2007

Stateless session beans can't maintain client specific state , so no need to pass initialization parameters to Stateless Session Bean

Srinivasan

• Dec 29th, 2006

stateless bean does not maintain the connection between client and container.Statefull maintain the connection between client and container.

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Arun Kumar D - SCJP, SCBCD 1.3

• Mar 26th, 2007

SessionSynchronization is an interface in the javax.ejb package. This interface can be implemented by the ejb to show the transactional state of the bean.The different methods that come into this inte...

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Answered by Jey Ramasamy on 2005-05-08 19:51:04: 1. setEntityContext() 2. ejbCreate() 3. ejbPostCreate() 4. ejbActivate() 5. ejbPassivate() 6. ejbRemove() 7. unsetEntityContext()

amics

• Mar 30th, 2007

 setEntityContext(EntityContext) unsetEntityContext() ejbLoad() ejbStore() ejbActivate() ejbPassivate() ejbRemove()

srini

• May 21st, 2006

No ejbcreate() is not a callback method

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Sony V George

• Apr 4th, 2007

We can improve efficency through Pooling. If you are asking how we can balance the load, we can do it through clustering so that we can balance the load. this one will reduce the server balancing. You can take either one .

CDT

• Sep 17th, 2005

In plain English, I think this question is asking how EJB is more efficient as user load increases. The correct answer is pooling. Pooling is implemented differently across application server implem...

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Inside an EJB you may retrieve the "Caller" name, that is the login id by invoking: sessionContext.getCallerIdentity().getName() where sessionContext is the instance of "SessionContext" (setSessionContext) passed to the Session Bean, or the instance of "EntityContext" (setEntityContext) passed to the Entity Bean.

Sony V George

• Apr 4th, 2007

You can get the User Name? by using the following codesessionContext.getCallerIdentity().getName() There is having two types of context 1.SessionContext2.EntityContext

uma

• Feb 12th, 2006

u can get the information abt the client(who invoked the bean) by the EJBContext methods.There r 2 types1)SessionContext and 2)EntityContext.These r used get the information abt the container,the client and get reference of the bean itself.

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Bhaktavatsalam Gani

• May 22nd, 2007

It is not possible to pass the HttpSession as part of the EJB method parameter. Because it is not serializable. If we want to pass the session information we need to create another class that can hold all the session values in a serializable form.

k_yogi85

• Apr 16th, 2007

You can pass the HttpSession as parameter to an EJB method, however you should have?all objects in session?be serializable.This has to be consider as passed-by-value, that means that its read-onl...

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Tamil Selvan

• May 28th, 2007

To access a servlet/jsp from EJB create a URL and call its openStream() method.URL google = new URL("http://www.google.com/"); BufferedReader in = new BufferedReader(new InputStreamReader(go...

ArulJothi

• Sep 18th, 2005

JSP or Servlet can communicate with EJB by giving the jndi name of that EnterpriseJavaBean in the lookup method of InitialContext.It will return a reference for the home interface of EJB.

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rajeev

• May 31st, 2007

It is possible. But J2ee spec restricts the use of certain api's for eg Reflection, io,etc.;)

Raja Seklhar reddy T

• Sep 11th, 2005

You use reflection when you actually instantiate the objects or invoke the method.In the EJB Scenario Beans invoke other Beans as clients. The client only looks up the objects (not instantiating) and ...

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bharanikumariyer

 Profile Answers by bharanikumariyer Questions by bharanikumariyer

• Jun 23rd, 2007

Message driven is like printer,it wont get reply from destination

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Answer posted by Mohan on 2005-05-21 17:20:02: Optimistic locking assumes that no one would read or change the data while changes are being by a bean Pessimistic locking would rather lock down the data so that no one can access it

rossbertoloni

 Profile Answers by rossbertoloni Questions by rossbertoloni

• Sep 3rd, 2007

Optimistic LockingIs based on the assumption that it is unlikely that separate users will access the same object simultaneously.  The EJB does not hold a lock for the duration of the transaction,...

John

• May 28th, 2005

In optimistic locking the row will not be locked until the actual update is performed. In order to prevent the lost update issue a version number column will be used. In pessimistic locking the row wi...

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Why do we require to write a deployment descriptor (ejb-jar.xml) in an xml format ? why don't we write it in a java file ?

Is there any special reason to write two interfaces in ejb(local , home interfaces ). why don't we write only one interface .

avisnk

 Profile Answers by avisnk Questions by avisnk

• Dec 20th, 2007

It will be caught in the methodone() catch block....ANy exception thrown will be look for a corresponding catch method...if not present, then look for the catch block in the caller method and so on....Since methodtwo() of urs doesnt have one it will be caught in the methodone() catch block......

Chaitanya . I

• Aug 11th, 2007

methodOne(){   try{        int i;      System.out.println( i++);          method...

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shankarsunmicrosys

 Profile Answers by shankarsunmicrosys Questions by shankarsunmicrosys

• Jan 17th, 2008

Transaction will be propogated from web tier to EJB tier, when the client code (web tier) is already in the transaction and server method (EJB) which is getting called has some transaction attributes like required,supports,mandatory etc.

Sree kumar

• Aug 16th, 2006

In the jsp the lookup of the jndi names comes then access the ejb component..for more clarrification keep in touch with this subject...

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