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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 9566

difference b/w the hybernate and entity bean

Wipro,

6 9663

Can CMP manage BMP Transaction ? Entity Bean Life Cycle ?

IBM, SAP Labs, Sony,

1 4060

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.

1377

Can Container managed Bean-Managed Persistence ?

Sony,

1281

Can Container Managed Bean-Managed Transaction ?

Sony,

3 4517

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

1 8063

ejb session beans and entity beans?

1 2527

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

HCL,

2 3462

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

3 4212

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

CGI,

2 4089

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 3186

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

3 3544

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

Excel,

3 3116

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

Excel,

1761


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Un-Answered Questions { EJB }

What do you mean by bean managed transaction?

158


Can you be deported if you are stateless?

102


What is an ejb container?

101


Is it possible to share an httpsession between a jsp and ejb?

129


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?

147






What is applicationscoped?

105


What is ejb container?

142


Is is possible for an ejb client to marshal an object of class java.lang.class to an ejb?

122


Differentiate “find a method” from “select method” in EJB ?

164


What is the advantage of using entity bean for database operations, over directly using jdbc api to do database operations?

118


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

118


Enlist the contents of Container.

160


What is dependency injection in ejb?

94


Why should we use ejb?

101


What is stateless session?

101