Why is ejb2.x considered as heavy weight and ejb3.0 is considered as light weight?What you mean by heavy/light weight? How it affects the performance of server?

Srinivas Nalla

• Jan 18th, 2012

EJB 3.0 is not really light-weight. EJB 3.0 differs from its earlier versions in terms of development and NOT performance. Using pojos and annotations, unwanted method implementations and deployment d...

Srinivas Nalla

• Jan 18th, 2012

EJB 3.0 is not really light-weight. EJB 3.0 differs from its earlier versions in terms of development and performance. Using pojos and annotations, unwanted method implementations and deployment descr...

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What is the expansion for BLOB & CLOB?

myogeshchavan97

 Profile Answers by myogeshchavan97 Questions by myogeshchavan97

• Jul 31st, 2009

Blob Stands for Binary Large Object.Clob Stands for Character Large Object.

itsvenuhere

 Profile Answers by itsvenuhere Questions by itsvenuhere

• Jul 28th, 2009

BLOB: Binmary Large ObjectCLOB: Character Large ObjectBoth of these are used to store large amounts of data.

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Which method is declared in the sessionbean interface?

Ranjith

• Oct 3rd, 2011

EjbActivate
ejbPassivate
ejbRemove
setSessionContext

Andrei VISAN

• Aug 26th, 2011

Create() method is declared in the session bean interface.

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Naveen

• Jun 6th, 2006

I'll  take a best exmaple to explain.Statefull sessionbean : ATM operationStateless Session Bean : Credit card Once we log into the ATM by entering PIN number. We can do multiple transacations li...

divya

• Jul 29th, 2005

Stateful session beans are used when there is converstional state and when there is a need of temporary storage  Stateless session bean are used when there is no conversational state and when session bean has to be used only for database access

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Answered by Jey on 2005-05-08 12:47:06: Entity bean represents the real data which is stored in the persistent storage like Database or file system. For example, There is a table in Database called Credit_card. This table contains credit_card_no,first_name, last_name, ssn as colums and there are 100 rows in the table. Here each row is represented by one instance of the entity bean and it is found by...

sujatawankhede

 Profile Answers by sujatawankhede Questions by sujatawankhede

• Jun 19th, 2006

entity bean are used to represent state of unique entity.for example. each employee have unique ID .

Ritesh Patni

• Jul 25th, 2005

The entity bean is used to represent data in the database. It provides an object-oriented interface to data that would normally be accessed by the JDBC or some other back-end API. More than that, enti...

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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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geeksterrahul

 Profile Answers by geeksterrahul Questions by geeksterrahul

• Jul 23rd, 2009

CMP gets complex when the query involves two or more tables. In such case you might want to go for a BMP.BMP is a good choice when the task involves two or more tables.CMP does not have support for certain JDBC CICS. In such case BMP is a good choice.

gskumar

• Sep 12th, 2005

When ever you want to use SAP or any ERP concept for ur back end then it is better to go for BMP's .If u are very particular about the performance of application then better use BMP rather than using CMP.

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Answered by Jey on 2005-05-08 12:33:35: If Client and EJB classes are in the same machine ( Same JVM) then we can use Local linterface instead of Remote interface. Since Client and EJB are in same JVM, values are passed by referance.

kasturi

• Nov 17th, 2005

Local interface is when the client and the ejb are colocated in a same jvm.Here the client is another EJB.In case of Local interface there is no need of throwing RemoteException rather it throws EJB Exception which is a subclass of Runtime Exception.so u may not catch tis exception.

Sowmy

• Sep 20th, 2005

Performance is upgraded when using a local interface because there are no RMI/IIOP network calls hence reducing the overhead.

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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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Answered by Jey on 2005-05-08 11:14:33: Session and Message Driven Bean will have only ejbCreate() method and no ejbPostCreate() method. Entity bean will have both ejbCreate() and ejbPostCreate() methods.  The ejbPostCreate method returns void, and it has the same input parameters as the ejbCreate method. If we want to set a relationship field to initialize the bean instance, we should do...

GG

• Mar 14th, 2006

How is ejbPostCreate() perform the fllow-up methods?

Sunil Kumar Naik

• Oct 28th, 2005

What we r writing in ejbpostcreate()?Explain with some example?

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vinaykurudi

 Profile Answers by vinaykurudi Questions by vinaykurudi

• Aug 13th, 2008

No, why because beans are maintaining?one bean pool. If any request comes to that bean it will first see in that pool if any instance is free, then that instance will be thrown to the request. If no ...

rogesh

• Jan 19th, 2006

I think 238 instances will created for one bean

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upendar_qtp

 Profile Answers by upendar_qtp Questions by upendar_qtp

• Mar 20th, 2006

u can just check the home interface of the session bean in order to detemine the whether it is stateless or stateful.if there is single create method in home interface with no argument then we can say...

mummasani

 Profile Answers by mummasani Questions by mummasani

• Mar 7th, 2006

Thanks all for valuable inputs...Those were really helpful...-Arpan Joshi

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The Geek

• Sep 15th, 2006

I agree with Jacks to an extent. So called N/W traffic issue is all bookish stuff. OK now see these scenario1) Client calling Entity Bean directly.client -------->Servlet ---------> Entity Bean2) Cli...

Jacks

 Profile Answers by Jacks Questions by Jacks

• May 17th, 2006

U also hides your business logic with its help, if any change occurs in logic your session facade don't require any change.

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keshab

• Dec 13th, 2006

In statefull session bean there is 1to 1 mapping between ejbObject and bean instenace , there is no need of pool

Sankar

• Oct 15th, 2006

Hi, We know that Stateful session beans are maintained a conversational state between the clients...and Stateful session bean's instance is only for a particular client ..the other clients can't u...

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muktasharad

 Profile Answers by muktasharad Questions by muktasharad

• Sep 7th, 2008

Number of clients can share the same instance of above mentioned bean because in stateful session bean multiple clients are assigned with one instance only, so they would all share taht instance.thank you!

NIRAJ KUMAR

 Profile Answers by NIRAJ KUMAR Questions by NIRAJ KUMAR

• Oct 20th, 2006

Hello Friends, Only one client can share a same instance of a stateful session bean.As the name suggested that stateful session beans maintained the session information of the client so only one client can share the same instance of a stateful session bean.

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bassem.aly

 Profile Answers by bassem.aly Questions by bassem.aly

• Jun 2nd, 2010

You have two option.If the EJB is local (in the same EAR) you will use @EJBIf the EJB outside ear you will lookup in Application server context.

Rizwan

• Feb 7th, 2007

First approach is also correct. But in that approach you have use narrow method whereas in this case you dont need it. By using this approach also we can call EJB from a jsp initalContext ic=...

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If we call remove() method on remote object, ejb container removes the one row data in a table. if we call a remove() method on home object, container removes object home object.

Arun Kumar

• Nov 23rd, 2006

remove() method call from the client on a session bean instance differs from stateless and statefull bean.For a stateless session bean the remove() does not cause any effect on the bean instance and i...

tarunarora

 Profile Answers by tarunarora Questions by tarunarora

• Nov 14th, 2006

Hi All,remove() method for session bean and entity bean behaves in a very different way...so we need to talk in context to these.remove() in Session bean means that ur done with ur work...n container...

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coolguy_krkr

 Profile Answers by coolguy_krkr Questions by coolguy_krkr

• May 11th, 2008

If you have no database transactions and you need just data fetch..I would not go for both of them..We can as well use simple dao with jdbc call to fetch data. If you have to pick one from the beans then definetely it would be stateless for this scenario.

s_s78

 Profile Answers by s_s78 Questions by s_s78

• May 3rd, 2006

If u are only reading the database then u dont need to use Entity been at all.Entity been slows down data fetch operation.U just need to use stateless session bean.

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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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