Tag: technology

Questions Related to technology

Can we implement an interface in JSP ?
technology programming languages

  1. Yes

  2. No

  3. May be

  4. Cant say

Show answer
Correct Option: B

Which of the following aren't the methods for state/session management in the context of Servlets?
technology programming languages

  1. Http Redirects

  2. Hidden Variables

  3. Cookies

  4. Rewritten URLs

  5. Using HttpSession Interface

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Correct Option: A

The variables local to the methods like service(), doPost() and doGet() are thread safe. True/False?
technology programming languages

  1. True

  2. False

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Correct Option: A
Explanation:

To solve this question, the user needs to know the basic concept of thread safety in Java and how it applies to local variables in methods like service(), doPost() and doGet().

The answer to this question is:

A. True

Explanation:

Local variables declared within a method are thread-safe because they are confined to the method and are not shared between threads. Each thread, when executing the method, will have its own copy of the local variables declared within the method. As a result, other threads cannot modify the values of these local variables, ensuring thread safety.

Therefore, the correct answer is option A, true.

You want to use URL rewriting to support client browsers, which do not use cookies. Which method will you use to attach the session id to a URL that is to be used for the sendRedirect() method of the HttpServletResponse?
technology programming languages

  1. encodeURL

  2. encodeRedirectURL

  3. encodeSessionURL

  4. encodeSessionRedirectURL

  5. None of these

Show answer
Correct Option: B

Which one of the following ServletRequest interface method returns more than one value associated with parameter?

technology programming languages

  1. getParameterValue()

  2. getParameters()

  3. getParamValues()

  4. getParameterValues()

Show answer
Correct Option: D

AI Explanation

To answer this question, we need to understand the difference between the methods getParameterValue() and getParameterValues() in the ServletRequest interface.

Option A) getParameterValue() - This option is incorrect because the getParameterValue() method returns a single value associated with a parameter. It does not return multiple values.

Option B) getParameters() - This option is incorrect because the getParameters() method returns a Map object containing all parameter names and their corresponding values. It does not specifically return multiple values associated with a single parameter.

Option C) getParamValues() - This option is incorrect because the getParamValues() method does not exist in the ServletRequest interface.

Option D) getParameterValues() - This option is correct because the getParameterValues() method returns an array of String objects containing all values associated with a parameter. If multiple values are associated with a parameter, this method allows you to retrieve all of them.

Therefore, the correct answer is option D. The getParameterValues() method returns more than one value associated with a parameter.

What is the default transaction attribute in EJB in case of was6.0?
technology web technology

  1. Not Supported

  2. Required

  3. Supports

  4. RequiresNew

  5. Mandatory

  6. Never

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Correct Option: B

A transactional client receives TransactionRolledBackException from a call to a method on an entity bean. What could be the possible reason(s) for this?
technology programming languages

  1. The bean method is throwing a checked exception and is configured with a transaction attribute of "Required".

  2. The bean method is throwing an unchecked exception and is configured with a transaction attribute of "Required".

  3. The bean does not throw an exception but is configured with a transaction attribute of "Mandatory".

  4. The bean method is throwing an unchecked exception and is configured with a transaction attribute of "Requires New".

Show answer
Correct Option: B

Your application supports multiple client types including HTTP clients. Your business layer is implemented using Enterprise Java Beans. Which of the following is best suited for maintaining client state?
technology programming languages

  1. Cookies

  2. Entity Beans

  3. HttpSession attributes

  4. Stateful session beans

  5. URL Rewriting

Show answer
Correct Option: D
Explanation:

To maintain client state, the user needs to know the different options available and which option is best suited to the given scenario.

A. Cookies: Cookies are small text files that are stored on the client's computer. They can be used to store client state information, such as user preferences or session IDs. While cookies can be effective for maintaining state, they have some limitations, such as a limited storage capacity and the potential for security vulnerabilities.

B. Entity Beans: Entity beans are used to represent persistent data in a Java Enterprise Edition (JEE) application. They are not designed to maintain client state.

C. HttpSession attributes: HttpSession attributes are used to store client-specific information on the server side. They are associated with a particular user session and can be used to maintain client state across multiple requests. This makes HttpSession attributes a good option for maintaining client state in a JEE application.

D. Stateful session beans: Stateful session beans are designed to maintain state across multiple requests. They are associated with a particular client and can be used to store client-specific information. This makes stateful session beans a good option for maintaining client state in a JEE application.

E. URL Rewriting: URL rewriting is a technique for adding session IDs to URLs. This allows the server to identify the client and maintain state across multiple requests. While URL rewriting can be effective for maintaining state, it has some limitations, such as the potential for security vulnerabilities and the impact on URL readability.

Based on the given scenario, the best option for maintaining client state is D. Stateful session beans, as they are designed to maintain state across multiple requests and are associated with a particular client. Option C. HttpSession attributes is also a good option since it can be used to maintain client state across multiple requests. Option A. Cookies and option E. URL Rewriting can also be used to maintain state but are less suited to the given scenario.

The Answer is: D. Stateful session beans

Which enterprise bean type is defined without any client view interfaces?
technology programming languages

  1. BMP Entity bean

  2. CMP Entity bean

  3. Stateful Session bean

  4. Stateless Session bean

  5. Message Driven Bean

Show answer
Correct Option: E

Which of the following is NOT an advantage of using the SessionFacade pattern?
technology programming languages

  1. Hides model complexity from the client

  2. Reduces network traffic

  3. Provides a simple interface to the client

  4. Enables the client to control transactions

Show answer
Correct Option: D