1. What does the EJB specification architecture define ? |
| Transactional components |
| Distributed object components |
| Server-side components |
All of the above
|
2. What executes EJB components ? |
| A web server |
| An application server |
| An EJB container |
A database server
|
3. What do enterprise beans use to communicate with the EJB container to get runtime context information ? |
| The javax.ejb.EJBContext provided by the container |
| A JNDI ENC context |
| A javax.ejb.EJBHome object provided by the container |
A javax.ejb.EJBMetaData object provided by the container
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4. Through what interface does an application create, find, and remove enterprise beans ? |
| java.rmi.Remote |
| javax.ejb.EJBHome |
| javax.ejb.EJBObject |
javax.ejb.EntityBean
|
5. What type of enterprise bean is used to embody business objects ? |
| javax.ejb.EnterpriseBean |
| java.rmi.Remote |
| javax.ejb.SessionBean |
javax.ejb.EntityBean
|
6. What type of enterprise bean is used to embody application processing state information ? |
| javax.ejb.EnterpriseBean |
| javax.rmi.Remote |
| javax.ejb.SessionBean |
javax.ejb.EntityBean
|
7. What interface must the enterprise bean implement so that an application can invoke its operations ? |
| javax.ejb.EntityBean |
| javax.ejb.EJBHome |
| javax.rmi.Remote |
javax.ejb.EJBObject
|
8. At what point, precisely, in the life-cycle is a container-managed entity bean considered created ? |
| Immediately prior to the execution of its ejbCreate() method |
| Immediately after the execution of its ejbCreate() method |
| After the CMP bean's data has been committed to the underlying persistent datastore |
During the execution of its ejbPostCreate() method
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9. What distinguishes a bean-managed persistent (BMP) enterprise bean from a container-managed persistent (CMP) enterprise bean ? |
| A BMP bean must implement the ejbLoad() and ejbStore() methods |
| A BMP bean can implement persistence to custom datastores such as legacy systems |
| A BMP bean is responsible for managing its own persistence to a persistent datastore |
All of the above
|
10. What is a deployment descriptor ? |
| An XML file format used by the container to learn about the attributes of a bean, such as transactional characteristics and access control |
| A method for transporting enterprise beans back and forth between systems |
| An XML file used by enterprise bean clients to learn about the attributes of a bean, such as access control and transactional characteristics. |
A format for bundling enterprise beans for delivery to customers.
|
11. A stateless session bean: |
| Is created when the client invokes sreate on the home |
| There must be one per client as long as the client is executing the business logic. |
| Is the most scalable type of bean |
B and C are correct
|
12. What happens when you pass a serialized object as an argument or return value that doesn't exist either in the Client or the Server ? |
| Nothing will happpen. |
| An error will occur |
| A run time exception is produced |
none of these
|
13. When you pass a Remote object to or from a remote method, what is really passed ? |
| The Remote object reference |
| A local copy of the remote object. |
| None of these |
The Remote object's stub
|
14. When a bean moves from the "does not exist" to the "method ready" status, in which order do the events take place ? |
| construction,ejbCreate(),setSessionContext() |
| construction,setSessionContext(),ejbCreate() |
| setSessionContext() only take place. |
None of these.
|
15. What is true for the isIdentical() method of the EJBObject interface for stateless session beans ? |
| Returns true if the stubs refferring to two different Remote EJB objects. |
| Create the session bean. |
| All of the above. |
None of these.
|
16. A Message-driven bean: |
| Has a client view |
| Doesn't feature a component interface. |
| Has a Remote interface |
Has a local interface
|
17. An entity bean: |
| can be shared between multiple clients as long as the entity being shared is same. |
| Must have its EJBObject interface. |
| A and B are correct. |
None of these.
|
18. Is an entity bean allowed to return objects that don't implement the component interface ? |
| Yes. |
| No. |
| Yes but only if they implement EJBHome interface |
Yes but only if they are RMI-IIOP types
|
19. What would you do in the constructor of a stateful session bean ? |
| Access the beans JNDI environment. |
| Get a reference to the bean's home. |
| Just nothing. |
None of these.
|
20. For remote objects Java passes objects: |
| By reference. |
| By object copy. |
| By producing a serialized copy. |
B and C are correct.
|
