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What is the difference b/w EJB2.1 and EJB3.0?
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 ...
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What is the difference between JavaBean and EJB
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
- 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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Can a Session Bean be defined without ejbCreate() method
Answer posted by Mohan on 2005-05-21 19:27:35: No
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What is EJB
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
- 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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What is meant by Serialization and Externalization? Serialization is a Marker interface,so what is the use of WriteObject() anf ReadObject(), Where it is actually used? Give me some real time examples?
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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What is the difference between ejb2.0 and ejb3.0 and i reviewed in net that ejb 3.0 using POJO(plain old java objects) what is pojoi want the reply for this
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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Comparison between ejb2.0 and ejb3.0
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
- 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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Wait(), notify() and notyfyAll() methods
Why wait(), notify() and notyfyAll() methods are avialble in Object class but not in Thread class? Explain.
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Editorial / Best Answer
janswain- Member Since Sep-2008 | Sep 25th, 2008
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
- 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
- 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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What is the difference between normal Java object and EJB
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...
EJB Interview Questions
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