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...

Answer Question  Select Best Answer

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.

Answer Question  Select Best Answer

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...

Answer Question  Select Best Answer

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.

Answer Question  Select Best Answer

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.

Answer Question  Select Best Answer

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.

Answer Question  Select Best Answer

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

Answer Question  Select Best Answer

Answer posted by Mohan on 2005-05-20 08:45:36: Stateful session beans have the passivated and Active state which the Stateless bean does not have.

srikanthm2

 Profile Answers by srikanthm2 Questions by srikanthm2

• Jan 28th, 2008

Stateful session beans follow the instance passivation techniqueStateless session beans follow the instance pooling technique.ejbActivate() and ejbPassivate() methods are not called in Stateless session beansI

Jeevan Sunkersett

• Jul 16th, 2007

Stateful Session Bean (SFSB) do not have the concept of pooling

Answer Question  Select Best Answer

mailtorkthakur

 Profile Answers by mailtorkthakur Questions by mailtorkthakur

• Apr 20th, 2006

Web server=========As its name dealing with the www. It is just an implementation of HTTP protocol (RFC1945,2616).Application server==============It is a host of separate implementaion of different pr...

Guest

• Apr 20th, 2006

Web server=========As its name dealing with the www. It is just an implementation of HTTP protocol (RFC1945,2616).Application server==============It is a host of separate implementaion of different pr...

Answer Question  Select Best Answer

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...

Answer Question  Select Best Answer

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.

Answer Question  Select Best Answer

Answer posted by Mohan on 2005-05-20 08:44:39: SessionBeans typically are used to represent a client they are of two typse  Stateful Session Beans : they maintain conversational state between subsequest calls by a client  Stateless Session Bean : consider this as a servlet equivalent in EJB. It is just used to service clients regardless of state and does not maintain any state....

Balakrishnan

• Oct 17th, 2005

Session bean is encapsulates the business logic. and carry out the task for behalf of the client. It have two types.one is stateful session bean. this is maintain the convesional state.another one is stateless session bean. donot maintain the conversional.state.

Chandana Ekanayake

• Oct 14th, 2005

 Ok,If you want to find the inverse of a Matrix then We can use session been encapsulated the logic of finding inverse of a matrix, is an example for stateless session been.&n...

Answer Question  Select Best Answer

Nandikonda Laxman

• Aug 22nd, 2006

I would say that the main reason is because there is a clear division of roles and responsibilities between the home and remote interfaces of an EJB. The home interface allows the client to communicat...

Viresh

• Apr 18th, 2006

Read Mastering EJB3 book An excellent refrence for all ejb enthusiasts but with limited knowledge. its available free at theserverside.com.

Answer Question  Select Best Answer

kamalagopinathan

• Feb 14th, 2007

Hai,Interface* Interface contain only method declaration* Interface implements more that onesAbstract* Abstract contain method declaration and definitions also* Abstract extend only one

Anand

• Apr 6th, 2006

Interface represents highest level of abstraction ie no declaration only definition of methods.

Answer Question  Select Best Answer

Chethan kumar

 Profile Answers by Chethan kumar Questions by Chethan kumar

• Jul 2nd, 2008

Not Supported

harish.verma

 Profile Answers by harish.verma Questions by harish.verma

• Mar 6th, 2007

The default choice for a transaction attribute is Required. Using this attribute ensures that the methods of an enterprise bean are invoked within a JTA transaction. In addition, enterprise beans with...

Answer Question  Select Best Answer

shahbazhafeez

 Profile Answers by shahbazhafeez Questions by shahbazhafeez

• Apr 18th, 2011

Remotely hosted scalable/distributed applications/services (which process and/or store/retrieve data) such that the client does not need to execute locally on a single machine.

coolguy_krkr

 Profile Answers by coolguy_krkr Questions by coolguy_krkr

• May 11th, 2008

Webservices are typically any services that can be published over the internet or on a wide range of networks so that the functionality is available to a wider audience..There is a slight differe...

Answer Question  Select Best Answer

Answered by Jey on 2005-05-08 19:41:22: Session bean callback methods differ whether it is Stateless or stateful Session bean. Here they are.  Stateless Session Bean 1. setSessionContext() 2. ejbCreate() 3. ejbRemove()  Stateful Session Bean   1. setSessionContext() 2.ejbCreate() 3.ejbPassivate() 4.ejbActivate() 5.ejbRemove() 

ganeshjava

 Profile Answers by ganeshjava Questions by ganeshjava

• Nov 26th, 2008

Please note down that ejbCreate() is not a method of Session Bean, for reference see the link?http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/ejb/SessionBean . html

Satish

• May 30th, 2007

Session callback methods setSessionContext();unsetSessionContext();ejbLoad();ejbActivate();ejbPassivate();ejbRemove();Entity bean call back methodspublic void setEntityContext(javax.ejb.EntityContext ...

Answer Question  Select Best Answer

Answered by Jey on 2005-05-08 11:23:41: In J2EE application modules are packaged as EAR, JAR and WAR based on their functionality  JAR: EJB modules which contains enterprise java beans class files and EJB deployment descriptor are packed as JAR files with .jar extenstion WAR Web modules which contains Servlet class files,JSP FIles,supporting files, GIF and HTML files are packaged...

smith

• May 13th, 2016

EAR
All above files(.jar and .war) are packaged as JAR file with .ear ( enterprise archive) extension and deployed into Application Server.

Smith

• May 13th, 2016

In J2EE application modules are packaged as EAR, JAR and WAR based on their functionality JAR: EJB modules which contains enterprise java beans class files and EJB deployment descriptor are packed ...

Answer Question  Select Best Answer

imran

• Jan 3rd, 2017

Flat transaction send out requests to different servers and each request is completed before client goes to the next one. Nested transaction allows sub-transactions at the same level to execute concurrently

Ahmed EL-Ghonimy

• Mar 17th, 2016

This question is tricky and wrong because comparing a Transaction Model with a transaction type is not correct. Flat transactions could be local (standard) or global (distributed). If it were straight forward, it would compare between flat and nested transactions.

Answer Question  Select Best Answer

bhushanamca

 Profile Answers by bhushanamca Questions by bhushanamca

• Jul 7th, 2009

Session Facade is a design pattern. It is used to reduce the network round trips between client and EJB comp. SLSB comp will act as session facade and it is receiving request from client and communic...

coolguy_krkr

 Profile Answers by coolguy_krkr Questions by coolguy_krkr

• May 11th, 2008

Session facade is one design pattern that is often used while developing enterprise applications.It is implemented as a higher level component (i.e.: Session EJB), and it contains all the iteractions ...

Answer Question  Select Best Answer