Absolutely yes, but the way to do that depends on the Exception, since there are no standards for that. Some examples: ·When you have an javax.ejb.EJBException, you can use the getCausedByException() that returns a java.lang.Exception. ·A java.rmi.RemoteException there is a public field called detail of type java.lang.Throwable ·With a java.sql.SQLException you need to use the method getNextException()...

manoj b raut

• Oct 26th, 2005

100% depends upon the mode of execution .

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Jignesh

 Profile Answers by Jignesh Questions by Jignesh

• Oct 31st, 2005

First of all the question is not very clear and specific. But I hope this helps:You call create() method of the home object which in turn calls the ejbCreate() of the bean and as you mentioned that th...

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Vijay

• Nov 1st, 2005

Hi All,The stateless bean is used whereever the logic does the same for all client irrespective of remembering the client state.For Example, Consider a simple EJB Client which just converts dollar to ...

Sree Ranganath

• Oct 26th, 2005

I  dont  think that St less bean is  used in this scenario  (ie.,   Credit card processing ) coz there it is a must that we have to remember the client.

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Mannu Kumar Pandey

• Nov 3rd, 2005

Here also we can write a complex query(complex select and find method) in our containen managed entity bean.

suman medisetti

• Oct 10th, 2005

Ejb query language is a new feature established in EJB2.0 it is based on SQL-92 standard specification,it is used for writing the queries for finder and select methods.

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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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Answered by Jey on 2005-05-08 12:33:35: If Client and EJB classes are in the same machine ( Same JVM) then we can use Local linterface instead of Remote interface. Since Client and EJB are in same JVM, values are passed by referance.

kasturi

• Nov 17th, 2005

Local interface is when the client and the ejb are colocated in a same jvm.Here the client is another EJB.In case of Local interface there is no need of throwing RemoteException rather it throws EJB Exception which is a subclass of Runtime Exception.so u may not catch tis exception.

Sowmy

• Sep 20th, 2005

Performance is upgraded when using a local interface because there are no RMI/IIOP network calls hence reducing the overhead.

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Chris Thompson

• Sep 18th, 2005

The primary key is the only way the container has of distinguishing one bean from another. This is particularly important for pooling, where the container uses the primary key to determine if the dat...

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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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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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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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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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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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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

• 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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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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bala

• Feb 10th, 2006

      the default state of a session bean is " STATELESS"

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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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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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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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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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