EJB Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

EJB Interview Questions

Questions Answers Views Company eMail

how can u integrate ejb and hibernate? How can u call hibernateDAO methods in session bean?

Infosys,

2 11441

difference b/w the hybernate and entity bean

Wipro,

6 12991

Can CMP manage BMP Transaction ? Entity Bean Life Cycle ?

IBM, SAP Labs, Sony,

1 5826

can anyone explain me the workflow of EJB.I have developed an app. in WSAD using an example that contains CMP and session bean.But i am not able to understand the basic flow between diffrent packages.

2306

Can Container managed Bean-Managed Persistence ?

Sony,

2120

Can Container Managed Bean-Managed Transaction ?

Sony,

3 6778

what is a ejb architecture? and overview of ejb software architecture?

1 9952

ejb session beans and entity beans?

1 3723

explain why we say stateless beans does not maintain conversation state besides statefull maintains conversation state. give some examples...

HCL,

2 5183

java doesnot support multiple inhetance. but a interface can support.how the ambiguities are rectified in interfaces?

3 6378

java doesnot support multiple inhetance. but a interface can support.how the ambiguities are rectified in interfaces?

CGI,

2 5902

In my project iam integrating telephone line using some bridge. To connect my project to that telephone line they have give some jar file. Using dat i connected with that.. To handle that event like call attented, call disposed and idle time they have give one event listener class.. I did every thing and this class is alsoo called when a particular event is fired. The only thing is i wanna call EJB from that event listener method.. But the EJB is not getting initated and exception is thrown. This below shownn error is occured only i try to call it from this event listener class. In other places EJB calling is working fine.. javax.naming.NoInitialContextException: Cannot instantiate class: org.jnp.interfaces.NamingContextFactory [Root exception is java.lang.ClassNotFoundException: org/jnp/interfaces/NamingContextFactory] at javax.naming.spi.NamingManager.getInitialContext (NamingManager.java:657) at javax.naming.InitialContext.getDefaultInitCtx (InitialContext.java:247) at javax.naming.InitialContext.init(InitialContext.java:223) at javax.naming.InitialContext. (InitialContext.java:197) at com.kgisl.etrac.desk.servicelocator.ServiceLocator.getInitia lContext(ServiceLocator.java:82) at com.kgisl.etrac.commonUtils.EventListener.getAdministrationE JBRemote(EventListener.java:206) at com.kgisl.etrac.commonUtils.EventListener.CallDispositioned (EventListener.java:65) Caused by: java.lang.ClassNotFoundException: org/jnp/interfaces/NamingContextFactory at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:242) at com.sun.naming.internal.VersionHelper12.loadClass (VersionHelper12.java:42) at javax.naming.spi.NamingManager.getInitialContext (NamingManager.java:654) ... 6 more javax.naming.NoInitialContextException: Cannot instantiate class: org.jnp.interfaces.NamingContextFactory [Root exception is java.lang.ClassNotFoundException: org/jnp/interfaces/NamingContextFactory] at javax.naming.spi.NamingManager.getInitialContext (NamingManager.java:657) at javax.naming.InitialContext.getDefaultInitCtx (InitialContext.java:247) at javax.naming.InitialContext.init(InitialContext.java:223) at javax.naming.InitialContext. (InitialContext.java:197) at com.kgisl.etrac.desk.servicelocator.ServiceLocator.getInitia lContext(ServiceLocator.java:82) at com.kgisl.etrac.commonUtils.EventListener.getAdministrationE JBRemote(EventListener.java:206) at com.kgisl.etrac.commonUtils.EventListener.CallDispositioned (EventListener.java:65) Caused by: java.lang.ClassNotFoundException: org/jnp/interfaces/NamingContextFactory at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:242) at com.sun.naming.internal.VersionHelper12.loadClass (VersionHelper12.java:42) at javax.naming.spi.NamingManager.getInitialContext (NamingManager.java:654) ... 6 more It would be more help full if i get the solution 10x in advance balaji

1 4446

how can we decide a session bean as stateless or stateful without seeing jar file? i.e. by seeing the class file.

3 5504

what is mean by dll ? Please answer me. Advance thanks.

Excel,

3 5113

what is mean by OLE ? Please answer me. Advance thanks.

Excel,

2661

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Un-Answered Questions { EJB }

Mention the three levels for applying interceptor methods.

942

What is the new basic requirement for a cmp entity bean class in 2.0 from that of ejb 1.1?

937

Explain the concept of ejb ql?

1044

what is the Relationship between EJB and CORBA architecture?

3818

Explain the concept of connection pooling feature of ejb container?

912

How do you decide whether you should use session, entity or message driven bean?

993

Name the acid properties of a transaction.

990

What is difference between ejb 1.1 and ejb 2.0?

951

Can EJB made to handle multiple transactions?

969

What is the use of @ejb annotation?

930

What is the difference between message driven beans and stateless session beans?

936

What are transaction isolation levels in ejb?

957

What do you mean by EJB architecture?

959

Is it possible to have threading in ejb?

938

Explain the architectural relationship between JavaBeans and JTA?

2913

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