upendar_qtp

 Profile Answers by upendar_qtp Questions by upendar_qtp

• Mar 20th, 2006

u can just check the home interface of the session bean in order to detemine the whether it is stateless or stateful.if there is single create method in home interface with no argument then we can say...

mummasani

 Profile Answers by mummasani Questions by mummasani

• Mar 7th, 2006

Thanks all for valuable inputs...Those were really helpful...-Arpan Joshi

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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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Vinoth Senthill M G

• Mar 6th, 2006

1. A Message Driven Bean (MDB) is an Enterprise JavaBean (EJB) similar to a session bean, except it responds to a JMS message rather than an RMI event. 2.MDBs were introduced in the EJB 2.0 specificat...

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EJBContext is an interface that is implemented by the container, and it is also a part of the bean-container contract. Entity beans use a subclass of EJBContext called EntityContext. Session beans use a subclass called SessionContext. These EJBContext objects provide the bean class with information about its container, the client using the bean and the bean itself. They also provide other functions....

santh kumar

• Feb 28th, 2006

Hi Guys,EJBContext interface provides methods for interacting with the container.Such as u can obtain the enterprise bean's remote home interface(getEJBHome() method),local home interface(getEJBLocalH...

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Supraja

• Feb 28th, 2006

For ConnectionPool Example for weblogic<JDBCConnectionPool   CapacityIncrement="1"   DriverName="com.pointbase.xa.xaDataSource"   InitialCapacity="2" MaxCapacity="10"   Name="de...

Supraja

• Feb 28th, 2006

To achieve clustering : You need to configure vendor specific deployment descriptor file(or other vendor specific manner) in order to get cluster aware EJB application. When you configure for clusteri...

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Jack

• Feb 28th, 2006

Current version right Now is EJB3.0[Jan 2006]EJB 3.0 FeaturesSession Beans ---------------POJO bean class - No requirement for implementing javax.ejb.SessionBean interfaces POJI interface - No require...

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K N

• Feb 22nd, 2006

Http://e-docs.bea.com/wls/docs81/jdbc/thirdparty.html#thirdparty001

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arunmr

 Profile Answers by arunmr Questions by arunmr

• Feb 20th, 2006

Hi, A message-driven bean is an enterprise bean that allows J2EE applications to process messages asynchronouslyAdvantages-----------------A single message Driven bean can process messages from multiple clientsThey are invoked asynchronously.

Anitha Baru

• Nov 4th, 2005

It processes multiple JMS msgs asynchronously. It has no home or remote interfaces, and so cannot be directly accessed by internal / external clients. Clients interact with MDB only indirectly by send...

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dev

• Feb 15th, 2006

tks a lot for giving nice answer plz tell me what is the difference b/n Runtime.gc() and System.gc()

Shiv Shankar

• Nov 25th, 2005

Grabage Collector is least priority thread. The task for the GC is to clear the memory used by the no reference objects in the heap.we can't force the GC to come but we can place the request to come i.e by calling System.gc() or Runtime.gc() methods.

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Answered by Jey on 2005-05-08 19:35:35: There are three isolation levels in Transaction. They are 1. Dirty reads 2.Non repeatable reads 3. Phantom reads.  Dirrty Reads If transaction A updates a record in database followed by the transaction B reading the record then the transaction A performs a rollback on its update operation, the result that transaction B had read is invalid as it has...

Ahmed

• Feb 14th, 2006

Isolation levels are Dirty_Read, Non Repeatable read and phantoms. These are the inconsistancies which are occured in transactions. To avoid these inconsistencies , we have 4 types of attributes.TRA...

J. P. Naidu

• Jul 28th, 2005

TRANSACTION_READ_UNCOMMITED TRANSACTION_READ_COMMITED=== Avoids dirty read  TRANSACTION_REPEATABLE_READ ===Avoids Non repeatable re TRANSACTION_SERIALIZABLE=== Avoids Phontom reads

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Nitin

• Feb 13th, 2006

Objects returned by looking up a JNDI Name are returned by RMI-IIOP protocol. Since this protocol is language independent, objects returned by it should be typecasted using RMI-IIOP compliant method. Therefore we use PortableRemoteObject.narrow()

gambhirgaurav

 Profile Answers by gambhirgaurav Questions by gambhirgaurav

• Jan 20th, 2006

Since client never talk to bean directly ,client get reference to component interface (EJBObject) by calling create() method on home interfaceClient use JNDI to get reference to home interface, f...

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bala

• Feb 10th, 2006

      the default state of a session bean is " STATELESS"

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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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shekhar

• Jan 21st, 2006

yes u create a class that implements serializable interface. make public attributes equals to fields u want and set values in attributes this make a complete row and pass it to jsp/servlet/bean method...

ratul_dg

 Profile Answers by ratul_dg Questions by ratul_dg

• Oct 20th, 2005

First of all, I don't quite get what you mean by tabular data.Please explain in detail.Anyway, if you want to send huge amount of data from the jsp to an ejb via servlet what you can do is write a dat...

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gambhirgaurav

 Profile Answers by gambhirgaurav Questions by gambhirgaurav

• Jan 20th, 2006

Yes we can have instance variables in Stateless Session Bean ,but these are not used to maintain the client specific state.

gokulakrishnan

• Sep 30th, 2005

No,In Stateless it does not maintain the contexual information about the client.In statefull we are having the ejbActivate(),ejbPassivate() bcoz it maintains the user specific data. but if we are giving the activation and passivation in stateless the container won't take these methods.

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shekhar singh

• Jan 18th, 2006

We can think session facade as little extended form of DTO Data transfer object .both is used to transfer Data(Rows) from Entity -> Session ->jsp/servlet and vice versa. this class implements Serializable interface and has gettrs/setters for all the fields of undelying table.

anju mishra

• Nov 16th, 2005

I dont know abt bussiness delegate. but session facade is when one EJB calls other, other calls other. This process continues and is called session facade. it is used to handle multilpe EJBS.

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dharmendracg

 Profile Answers by dharmendracg Questions by dharmendracg

• Jan 15th, 2006

Txns is a unit of work which guaranties about it's execution.

kedar

• Jan 7th, 2006

Transactions ensure that database actions are consistent. Consider a case where a record is required to be added to say two databases simultaneaously. If the record is added to both the databases, act...

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Ravi Biradar

• Dec 23rd, 2005

Member variables are used for this purpose.

Vijii

 Profile Answers by Vijii Questions by Vijii

• Dec 22nd, 2005

Passivation is used by container to move beans to storage based on least recently used algorithm.It is not used for maintaining client state.Hence the member variables are used for that purpose.

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D

Vijii

 Profile Answers by Vijii Questions by Vijii

• Dec 22nd, 2005

Stateful sessions beans maintain their state within the EJB layer itself.It is taken care of by the container,whereas the Web Layer maintains its state using cookies or HttpSession object.

srikanth

• Oct 27th, 2005

statefulsession beans maintains their state by using session id which can be stored in server side and client side using cookies.next time client interact with application with using of session id bean state is coming back from .ser file and services the client

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Dinesh

• Nov 19th, 2005

Servlet is used to exceute on the webbased,which is used to seperate the Dynamic and static Content.It acts as a Controller in MVC .JSP is a Presentation Layer.Which has the Dynamic Html it embedded with java code.Its use to mix both Dynamic and Static content

Dharmendra singh

• Nov 18th, 2005

jsp is the server side programme where the java code can embeded into the html tag. whereas servlet is pure java class where the entirehtml page can be genrated

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