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 11655

difference b/w the hybernate and entity bean

Wipro,

6 13443

Can CMP manage BMP Transaction ? Entity Bean Life Cycle ?

IBM, SAP Labs, Sony,

1 5999

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.

2453

Can Container managed Bean-Managed Persistence ?

Sony,

2237

Can Container Managed Bean-Managed Transaction ?

Sony,

3 7098

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

1 10139

ejb session beans and entity beans?

1 3913

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

HCL,

2 5382

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

3 6678

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

CGI,

2 6137

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 4638

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

3 5777

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

Excel,

3 5380

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

Excel,

2808

Post New EJB Questions

Un-Answered Questions { EJB }

What does @singleton annotation do?

1072

What are the advantages of java beam?

1173

Is functional programming stateless?

1060

What is stateful or stateless?

1032

What is ejb container in java?

1007

What is stateless programming?

1156

What is ejb application?

1005

What is ejbdoclet?

1005

A client wants to preserve the reference to the ejbhome object of an enterprise bean instance and use it later. Which of the following can be serialized for this purpose?

1055

What does statelessness mean?

1085

Is it possible to have threading in ejb?

1054

What is bean-managed persistence?

1106

Explain ejbhome and ejbobject in ejb?

1137

What are the basic and subtypes of enterprise java beans (ejb)?

1108

Which of the recommended practices to be performed in the ejbpassivate() method of a stateful session bean?

1154

For More Un-Answered { EJB } Questions Click Here