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 11450

difference b/w the hybernate and entity bean

Wipro,

6 13011

Can CMP manage BMP Transaction ? Entity Bean Life Cycle ?

IBM, SAP Labs, Sony,

1 5835

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.

2314

Can Container managed Bean-Managed Persistence ?

Sony,

2127

Can Container Managed Bean-Managed Transaction ?

Sony,

3 6791

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

1 9966

ejb session beans and entity beans?

1 3740

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

HCL,

2 5190

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

3 6384

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

CGI,

2 5912

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 4451

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

3 5516

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

Excel,

3 5126

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

Excel,

2669

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Un-Answered Questions { EJB }

What is difference between ejb 1.1 and ejb 2.0?

958

2314

What is entity beans in ejb with example?

923

How many types of session beans are available in ejb?

927

What does ejb stand for?

999

Is ejb a framework?

919

Write the basic requirement of a cmp entity based class in 2.0 from ejb 1.1?

969

Explain the architectural relationship between JavaBeans and JTA?

2925

How is ejb different from java beans?

913

How does ejb work in java?

941

What is rmi and ejb in java?

953

What do you mean by ejb ql?

978

What is the difference between Session bean and Entity bean?one?

1063

How is consistency maintained by Stateful Session through transaction updates ?

1118

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

1005

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