Raj

• Nov 6th, 2006

When ejbFind/ejbSelect(select query) fails entity bean will throw FinderExceptionWhen ejbCreate(insert query) fails entity bean will throw CreateException

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anindita

• Oct 10th, 2006

It is usually thrown from ejbLoad() and ejbStore() methods. This occurs when the row the entity bean tries to update doesnot exist.

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Raj

• Nov 6th, 2006

Interfaces are used in client to call the implementation class running in server.

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anil

• Sep 28th, 2006

Generally,these two interfaces are implemented by the EJB Container.

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chirag desai

• Sep 27th, 2006

hi,well, in case of stateless session bean you have at least one ejb create method with out any arguments while in case of stateful session bean you can have one opr more than one ejbcreate method wit...

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pradeep.gt

• Jul 24th, 2005

1. doesnot exsist 2. exsists 3. passivate  invoke ejbcreate() set the sessioncontext() call create()  if the session idle call ejbPassivate() to get back t...

John

• May 3rd, 2005

a Stateful Session Bean has three states. Does not exists, Method Ready and Passivated states.  Like Stateless beans, when the Stateful Session Bean hasnt been instantiated yet (so it is not...

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pradeep

• Jul 24th, 2005

1. dose not exsist 2. exsist  to start the session set the sessionContext() call create()  to end session call remove

Kiran

• May 3rd, 2005

stateless session bean has only two states: Does Not Exists and Method Ready Pool.  A bean has not yet instantiated (so it is not an instance in memory) when it is in the Does Not Exists st...

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krishna_darl

 Profile Answers by krishna_darl Questions by krishna_darl

• May 21st, 2006

CMP means container takes care fo all the database access code synchronization, including adding and deleting entities(records/rows in the database)BMP means you write the database access code(the JDBC statements) , for when the container tells you its time to go to the database.

RajeshRokkam

• Jun 2nd, 2005

CMP::  Advantages: 1)Easy to develop and maintain. 2)Relationships can be maintained between different entities. 3)Optimization of SQL code will be done. 4)Larger and mor...

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J. P. Naidu

• Jul 28th, 2005

Session Bean comes with the implicit services where as HHTPSession does not.   Session Bean can be web based or can be stand alone where the other can only be web based.  Session Bean can be used for multiple operation for a single HTTP request but the other cannot.

Sam P

• May 3rd, 2005

From a logical point of view, a Servlet/JSP session is similar to an EJB session. Using a session, in fact, a client can connect to a server and maintain his state. But, is important to understan...

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Ashok

• Jun 27th, 2005

A select method is similar to a finder method for Entity Beans, they both use EJB-QL to define the semantics of the method. They differ in that an ejbSelect method(s) are not exposed to the client and the ejbSelect method(s) can return values that are defined as cmp-types or cmr-types. 

Rajesh

• Jun 15th, 2005

Select method is not there in EJBs

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Answer posted by Mohan on 2005-05-21 17:08:14: Session Context Contains information that a Session Bean would require from the container  Entity Context contains the information that an Entity Bean would require from a container

Mohan

• May 21st, 2005

Session Context Contains information that a Session Bean would require from the container  Entity Context contains the information that an Entity Bean would require from a container

kanth

• Apr 28th, 2005

Entity beans use a subclass of EJBContext called EntityContext. Session beans use a subclass called SessionContext

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Answered by Nikhil on 2005-05-11 11:28:14: Lazy loading is a characteristic of an application when the actual loading and instantiation of a class is delayed until the point just before the instance is actually used. The goal is to only dedicate memory resources when necessary by only loading and instantiating an object at the point when it is absolutely needed.  Tools such as Eclipse have...

catura_ashish

 Profile Answers by catura_ashish Questions by catura_ashish

• Oct 6th, 2005

In Lazy loading, you load the child data as and when required.Example:public class OrderBean implements EntityBean {        private long orderId;   &n...

Nikhil

• May 11th, 2005

Lazy loading is a characteristic of an application when the actual loading and instantiation of a class is delayed until the point just before the instance is actually used. The goal is to only dedica...

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JavaPerson

• Jul 21st, 2005

Decorator is not a EJB Design pattern. It is a Java pattern.

sai

• Apr 28th, 2005

No

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Saket

• Sep 14th, 2005

Its possible to map more than one tables to a CMP. Have a look athttp://e-docs.bea.com/wls/docs81/faq/ejb.html#260273

Srinivas Jadcharla

• Jul 18th, 2005

No

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Ravi Dalal

• Sep 19th, 2005

stateful beans maintains their state through instance variables. the values of the instance variables is specific to client. when the bean instance needs to be removed from the pool (usually LRU repla...

Srinivas Jadcharla

• Jul 18th, 2005

A stateful session bean is an enterprise bean (EJB component) that acts as a server-side extension of the client that uses it. The stateful session bean is created by a client and will work for only t...

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Bikram Bhusan Sinha

• Jul 12th, 2006

Clusters are a group of servers working together to achieve a common goalsIt will provide the following benefits to an application :1. High availability2. Scalability - vertical and horizontal3. Load ...

srisubu

• Jul 21st, 2005

A cluster is loosely coupled group of servers that provide a unified, simple view of the services that they offer individually. Servers in a cluster may or may not communicate to one another. Generall...

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Ananda

 Profile Answers by Ananda Questions by Ananda

• Jan 28th, 2006

It is required by the EJB specification that the Container should be able to automatically generate unique primary keys using Object as key for CMP Entity beans. This is very useful when you don't nee...

Ginni Gandhi

• Jul 21st, 2005

If you mean, auto generated primary key with values as numeric. This can be acheived in EJB 2.0 by using tag. You need to define and to specify how the keys are generated.  If generation ty...

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veera kumar vangara

• Nov 14th, 2005

For each  bean we can specify ejb-object, ejb-interface,ejb-home object,ejb-home interface.

Venkata Subbarao Bathula

• Jul 22nd, 2005

Only one Object Created for a bean.

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Answer posted by Mohan on 2005-05-21 18:34:01: CMP uses abstract schema to map to the physical database

Ashok

• Jun 27th, 2005

In cmp, the cmp bean is given an abstract schema name. In EQL you retrieve the data in a bean using these schema names.

Mohan

• May 21st, 2005

CMP uses abstract schema to map to the physical database

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Answered by Jey on 2005-05-08 12:09:49: Re-entrant means where Bean A calls methods of Bean B and then Bean B turns around and calls methods of Bean A. The above all within a single thread of control. This is also called as loopback.  Entity beans are the only one bean that is reentrant. Neither Session bean nor Message Driven Bean are reentrant. When Entity bean, we have to declare in the...

akundu

 Profile Answers by akundu Questions by akundu

• Oct 3rd, 2006

Also, check the deployment descriptor called <idempotent-methods> in weblogic-ejb-jar.xml. If methods are marked as Idempotent, then repeated calls to the same method with the same parameters ha...

Jey

• May 8th, 2005

Re-entrant means where Bean A calls methods of Bean B and then Bean B turns around and calls methods of Bean A. The above all within a single thread of control. This is also called as loopback.&n...

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