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 11553

difference b/w the hybernate and entity bean

Wipro,

6 13246

Can CMP manage BMP Transaction ? Entity Bean Life Cycle ?

IBM, SAP Labs, Sony,

1 5930

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.

2380

Can Container managed Bean-Managed Persistence ?

Sony,

2183

Can Container Managed Bean-Managed Transaction ?

Sony,

3 6955

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

1 10064

ejb session beans and entity beans?

1 3819

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

HCL,

2 5291

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

3 6531

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

CGI,

2 6025

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 4551

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

3 5654

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

Excel,

3 5254

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

Excel,

2742

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Un-Answered Questions { EJB }

Can an ejb send asynchronous notifications to its clients?

979

What do you mean by in-memory replication?

1070

Why stateless is better than stateful?

1037

Enlist the declarative transaction types?

1027

What is the full form of ejb in java?

1073

What are the attributes of transaction in ejb?

964

What are the differences between ejb 3.0 and ejb 2.0?

1012

For ejb applications with bean-managed transaction demarcations, which of the following is used by the client to get a reference to the usertransaction object for the weblogic server domain?

1000

what is the Relationship between EJB and CORBA architecture?

3880

What is session facade in ejb?

1024

Explain the architectural relationship between JavaBeans and JTA?

3023

What happens when I change a value in the httpsession from inside an ejb?

983

How can enterprise javabeans be accessed from active server pages?

1027

Name the attributes of javax.ejb.ejb.

950

What is meant by ejb?

953

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