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 Related Questions 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. ... Answered by Jey on 2005-05-08 17:27:45: ACID is releated to transactions. It is an acronyam of Atomic, Consistent, Isolation and Durable. Transaction must following the above four properties to be a better Latest Answer : Atomic-- should execute all or nothing...rollback come into picture Consistent--Consistency is a transactional characteristic that must be enforced by both the transactional system and the application developer Isolation -- transaction must ... 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 Latest Answer : 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.TRANSACTION_READ_UNCOMMITED TRANSACTION_READ_COMMITED=== ... Answered by Jey on 2005-05-08 18:01:39: There are six transaction attributes that are supported in EJB. 1. NotSupported 2. Supports 3. Required 4. RequiresNew 5. Mandatory 6. Latest Answer : There are six transaction attributes that are supported in EJB. 1. NotSupported 2. Supports 3. Required 4. RequiresNew 5. Mandatory 6. Never ... Answered by Jey on 2005-05-08 11:23:41: In J2EE application modules are packaged as EAR, JAR and WAR based on their functionality JAR: EJB modules which contains enterprise java beans class Latest Answer : EAR is an EEnterprise Aapplication archive and may contain ejb JAR files, WAR files, and RAR (connector) files. They may also contain third-party libraries - but you have to know how to manipulate the Java extension facilities (e.g. MANIFEST.MF Class-Path ... Answered by Jey on 2005-05-08 12:59:41: Deployment Descriptor is a XML document with .xml extenion. It basically descripes the deployment settings of an application or module or the component. At runtime Latest Answer : Deployment Descriptor is a XML document with .xml extenion. It basically describes the deployment settings of an application . At runtime webcontainer reads the deployment descriptor and understands which .class file is mapped to the url-patteren ... Latest Answer : 2 types of exceptions can occur 1.System Exception - We can define some error codes the in the property file and show it to the JSP 2.Application Exception.. - We can customise the exception and show the appropriate error ... If i throw a custom ApplicationException from a business method in Entity bean which is participating in a transaction, would the transaction be rolled back by container. Does container rolls back transaction only in case of SystemExceptions Answer posted by Mohan on 2005-05-21 17:21:54: yes the rollback will occur Latest Answer : The MDB is stateless and inherently each message is unique with respect to the MDB. Each message needs to be processed independently. Hence the need for separate transactions ... If my session bean with single method insert record into 2 entity beans, how can I know that the process is done in same transaction (the attributes for these beans are Required) If your method in the session bean is already running under a transaction the calls to any other bean which have been deployed with trans-attribute 'Required' will be executed within the same
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