41. Which of the following is not an Enterprise Beans type?

1. 1. Stateless

   
   
   

   2. Stateful

   
   
   

   3. Doubleton

   
   
   

   4. Singleton

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   Stateful, Stateless and Singleton are session beans.

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42. What does Liskov substitution principle specify?

1. 1. child class can be substituted by parent class

   
   
   

   2. parent class can be substituted by child class

   
   
   

   3. No classes can be replaced by each other

   
   
   

   4. parent class cannot be substituted by child class

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   Liskov substitution principle states that Objects in a program should be replaceable with instances of their sub types without altering the correctness of that program.

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43. What should the return type of method where there is no return value?

1. 1. Empty collection

   
   
   

   2. Null

   
   
   

   3. Empty String

   
   
   

   4. Singleton collection

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   Returning Empty collection is a good practice. It eliminates chances of unhandled null pointer exceptions.

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44. Which of the following is not an advantage of Hibernate Criteria API?

1. 1. Can add conditions while fetching results

   
   
   

   2. Allows to fetch only selected columns of result

   
   
   

   3. Allows to use aggregate functions

   
   
   

   4. Cannot order the result set

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   addOrder() can be used for ordering the results.

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45. In which file database table configuration is stored?

1. 1. .hbm

   
   
   

   2. .sql

   
   
   

   3. .ora

   
   
   

   4. .dbm

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   Database table configuration is stored in .hbm file.

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