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What is re-entrant. Is session beans reentrant. Is entity beans reentrant

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 deployment descriptor whether it is reentrant ( true or false). 
 
True/False 
 
 




  
Total Answers and Comments: 2 Last Update: October 03, 2006   
  
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May 08, 2005 12:09:49   #1  
Jey        
RE: What is re-entrant. Is session beans reentrant. Is entity beans reentrant
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 deployment descriptor whether it is reentrant ( true or false). 
 
True/False 
 
 
 

 
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October 03, 2006 17:26:40   #2  
akundu Member Since: October 2006   Contribution: 2    
RE: What is re-entrant. Is session beans reentrant. Is...
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 has exactly the same effect as a single call. Useful though not directly relevant to the re-entrant discussion.
 
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 Related Questions

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 
Latest Answer : 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 normal java classEJB :1. High-level approach to build Distributed ...
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 
Latest Answer : 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. ...
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. 
Latest Answer : 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 ...
Latest Answer : 1. doesnot exsist 2. exsists 3. passivate  invoke ejbcreate() set the sessioncontext() call create()  if the session idle call ejbPassivate() to get back to session call ejbActivate()  to end the ...
Latest Answer : 1. dose not exsist 2. exsist  to start the session set the sessionContext() call create()  to end session call remove ...
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. 
Latest Answer : 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 ...
Latest Answer : I'll  take a best exmaple to explain.Statefull sessionbean : ATM operationStateless Session Bean : Credit card Once we log into the ATM by entering PIN number. We can do multiple transacations like Balance enquiry, Withdrawl, ministatement..etc... ...
Answered by Jey on 2005-05-08 12:47:06: Entity bean represents the real data which is stored in the persistent storage like Database or file system. For example, There is a table in Database called Credit_card. 
Latest Answer : entity bean are used to represent state of unique entity.for example. each employee have unique ID . ...
Answered by Jey on 2005-05-08 11:32:16: CMP means Container Managed Persistence. When we write CMP bean , we dont need to write any JDBC code to connect to Database. The container will take care of connection 
Latest Answer : CMP means Container Managed Persistence. In case of CMP bean , developers dont need to write any JDBC code to connect to Database. The container will take care of connection our enitty beans fields with database. The Container manages the persistence ...
Latest Answer : The following steps describe the life cycle of an entity bean instance  An entity bean instances life starts when the container creates the instance using newInstance and then initialises it using setEntityContext.  The instance enters ...

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