What will happen when the HttpSession.setAttribute() method is called the second time with the same attribute name?

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  1. An IllegalStateException exception will be thrown because of the presence of

  2. A second call to setAttribute() with the same attribute name will just replace the

  3. The behavior is not defined in the Servlet Specification.

  4. None of the above.

Show answer
Correct Option: B
Explanation:

To answer this question, the user needs to know about the HttpSession and its setAttribute() method.

Option A: This option is incorrect. IllegalStateException is thrown when we try to set an attribute on an already invalidated session, not when we set an attribute with the same name.

Option B: This option is correct. A second call to setAttribute() with the same attribute name will just replace the previous value associated with the attribute name with the new value.

Option C: This option is incorrect. The Servlet Specification does define the behavior of HttpSession.setAttribute() method when it is called the second time with the same attribute name.

Option D: This option is incorrect as option B is the correct answer.

Therefore, the correct answer is:

The Answer is: B. A second call to setAttribute() with the same attribute name will just replace the previous value associated with the attribute name with the new value.

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