AkshataShriyan

 Profile Answers by AkshataShriyan Questions by AkshataShriyan

• Jul 3rd, 2009

They are call back methods.They are used to notify ejb beans of the state.Called at the boundaries of the transaction.Whenever tx.begin(), ejbload() is called to notify beans of data being refreshedWhenever tx.commit, ejbstore() is called to notify beans that data is being persisted

VenkitaKrishnan

 Profile Answers by VenkitaKrishnan Questions by VenkitaKrishnan

• Apr 20th, 2009

These 2 callback methods are avaliable in the EntityBean Interface and will be used by the container to load the data from the Database into the Bean (ejbLoad) and from the bean to the Database (ejbSt...

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What is the need of EJB?

Satish gupta

 Profile Answers by Satish gupta Questions by Satish gupta

• Oct 29th, 2011

a business application consist of different-different layers like 1) User Interface development 2) Business logics development 3)database operation development EJB is used for Business logics develo...

Abhishek

• Oct 13th, 2011

EJB : It provides another layer where the platform's logic is stored. an EJB server provides functions such as Threading , concurrency , security and memory that(all of them ) is not provided by other container like tomcat so we need a EJB container.

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Answered by Jey on 2005-05-08 11:32:16: CMP means Container Managed Persistence. When we write CMP bean , we dont need to write any JDBC code to connect to Database. The container will take care of connection our enitty beans fields with database. The Container manages the persistence of the bean. Absolutely no database access code is written inside the bean class.  BMP means Bean Managed Persistence....

Kapil

• Aug 5th, 2011

Only Difference that in CMP no need to Write Database Connectivity Code And In BMP no need to Write the Code

Debabrata Sau

• Feb 8th, 2006

CMP means Container Managed Persistence. In case of CMP bean , developers dont need to write any JDBC code to connect to Database. The container will take care of connection our enitty beans...

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Answer posted by Mohan on 2005-05-21 19:26:48: No

L.GANESH

• Oct 9th, 2006

Hi,We can call Runtime.gc() explicitly as you (all) described. But some time "May be usefull". Otherwise "No Use". When ?. Note that If we call garbage collection explicitly, this "WILL NOT GARBAGE CO...

Rajendra

• Feb 27th, 2006

 no we cannot invoke Runtime.gc() in an EJBBecause Enterprise Beans doesn,t need to call gc.

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Manivannan Palanichamy

• Aug 23rd, 2006

Hi, See my answers below:>1. How EjbQL ara impemented when it is necessary?EjbQL is defined by ejb spec. The container actually uses these queries in place of the method calls like findByXXX(), sel...

Suresh

• Jul 7th, 2006

CMP means ContainerManagementPersistence. In this container will take care all database related things.

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prefer not to say

• May 31st, 2006

I would suggest everyone to check with any one because many people who might be novice to Java might think that the answer is correct...so please refrain from posting half correct answersEjb component...

antony_praveen80

 Profile Answers by antony_praveen80 Questions by antony_praveen80

• Mar 24th, 2006

The EJB architecture is build upon the DCOM mechanism. So The bean class  can be accessable by across the network and it can be reused anywhere.

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maulin rao

• Nov 30th, 2006

This are call back methods It means container will call this method before it actually activate or passivate the bean. This gives you a chance to put your own logic to do some stuff like logging or clean up.

bhargavi

• Oct 25th, 2006

Ur answer seems to be the one given like a kid

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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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jettyprakash

 Profile Answers by jettyprakash Questions by jettyprakash

• Mar 8th, 2008

Clients never dealt with direct instances of Entity Bean. It deals with container implementations of home and component interface (stubs & skeletons - aka deployement code)It is the container responsibility to Wrap a class around the abstract definition of Entity bean.

jayanandan

 Profile Answers by jayanandan Questions by jayanandan

• Jan 14th, 2008

it is upto container which instantitates and maintain all entity bean in the ejb container.But to act like a entity bean,the developer has to implement EntityBean and all abstract methods defined in i...

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How are parameters passed to a method of a distributed object using RMI-IIOP?

NovaCarolina

 Profile Answers by NovaCarolina Questions by NovaCarolina

• May 12th, 2010

The parameters which are passed to remote methods will be a copy of the actual parameter objects. The basic rule is that the parameters should be Serializable or primitives. The remote JVM will get an exact copy of the objects being passed as parameters from the client JVM.

nitinpokhriyal

 Profile Answers by nitinpokhriyal Questions by nitinpokhriyal

• Jun 14th, 2009

In remote calls, parameters passed by value not by reference.

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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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