rebolloomare

 Profile Answers by rebolloomare Questions by rebolloomare

• Jun 16th, 2011

EJB is a specification to develop JEE applications.

srinivask82

 Profile Answers by srinivask82 Questions by srinivask82

• Jun 11th, 2008

An EJB object is also an java object, but as it follows the EJB Specifications, it can be remotely identified in an Application server. An java object can be deployed in an application server, but can...

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Satish gupta

 Profile Answers by Satish gupta Questions by Satish gupta

• Oct 29th, 2011

We have to make remote interface using @Remote in an ejb3 application

Satish gupta

 Profile Answers by Satish gupta Questions by Satish gupta

• Oct 29th, 2011

using ejb2 framework application provides the business layer logic's in distributive and secured manner but it is little bit heavy weighted and complex, so to reduce its complexity and to overcome the...

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am577

 Profile Answers by am577 Questions by am577

• Dec 27th, 2009

The deployment descriptors are no longer required; everything can be accomplished using metadata annotations. The CMP (Container Managed Persistence) has been simplified; it is now more l...

thomaskm

 Profile Answers by thomaskm Questions by thomaskm

• Apr 27th, 2007

The major differences i have seen between EJB 2.x and EJB 3.0 versions are as follows :- 1). Removal of home interface enabled simple lookup process in ejb 3.0 2). EJB deployment descriptors are not r...

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Why wait(), notify() and notyfyAll() methods are avialble in Object class but not in Thread class? Explain.

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janswain  

 Profile Answers by janswain Questions by janswain

• Member Since Sep-2008 | Sep 25th, 2008

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Each object in java is associated with a lock and the wait and notify methods are not associated with a thread but with a lock, so?coupling locks and objects meant that each object should have wait and notify methods that operate on that objects lock.

Java provides a way to lock the code for a thread which is currently executing it using the synchorinized keyword, and making other threads that wish to use it wait until the first thread is finished.These other threads are placed in the waiting state .Once the first thread completes it task than it notifies others in the queue by giving the lock to JVM.Now JVM decides which thread will exceute next by its internal algo.Hence, the wait and notify methods has to be in Object class as it acquires lock and has to notify others.....

tarunkgupta

 Profile Answers by tarunkgupta Questions by tarunkgupta

• Sep 2nd, 2010

A thread having a lock on the shared object (by using synchronized constructs) can invoke these methods on that shared Object. It gives a hint to JVM scheduler to pick or block the next thread contend...

NovaCarolina

 Profile Answers by NovaCarolina Questions by NovaCarolina

• May 12th, 2010

A lock is done on an object. It is an obect which is locked, hence these methods are characteristics of the object, hence defined in the Object class.

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opbehera

 Profile Answers by opbehera Questions by opbehera

• Feb 8th, 2010

EJB is a distributed technology i.e capable of developing  java based  distributed applications, enterprise application & heavy weight business component giving the advantages of readyma...

sai.pappu

 Profile Answers by sai.pappu Questions by sai.pappu

• Sep 26th, 2008

EJB is an server side component & its a WODA ( Write Once Deploy Any Where).EJB's run will under the control of EJB container.EJB is popular due to System level services provided by it.Developer can more concentrate on Business Logic due to services provided byu EJB.thanks.

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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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Answer posted by Mohan on 2005-05-20 08:40:04: Java Beans is intra-process component where as EJB is an Inter-Process component  JavaBeans is particularly well-suited for asynchronous, intra-application communications among software

sai.pappu

 Profile Answers by sai.pappu Questions by sai.pappu

• Sep 12th, 2008

JavaBean :1. Low-level approach for developing re-usable components for building different Java applications (Applets, stand-alone applications etc.).2. Java Beans runs in a JVM, just like other norma...

Guest

• Dec 14th, 2005

JavaBeans- are reuseable,non-deployable components. They can't exist independently.EJB - are deployable, reuesable, server side components. They can exist independently or in integration with other components.

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Answer posted by Mohan on 2005-05-21 19:27:35: No

Vasanth

• Apr 12th, 2006

We must have a  ejbCreate(); to create a Session bean .

Abhinav Prakash

• Feb 20th, 2006

We cannot have a session bean without ejbCreate().the bean class must implement the session bean interface. ejbcreate is declared in the interface.ejbCreate() is a container call back method which is ...

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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 ...

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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 ...

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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.

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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 ...

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saankhya2003

 Profile Answers by saankhya2003 Questions by saankhya2003

• Jul 29th, 2008

The main difference lies in the persistence, In case of EJB 3.0 there?is JPA, Java persistence API which makes the mapping of EntityBeans with the database easy, with the help of a service called as ...

timmireddy

 Profile Answers by timmireddy Questions by timmireddy

• Jul 14th, 2008

Enterprise Application development is too easy in EJB3.0

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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...

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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.

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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.

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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...

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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...

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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

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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...

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