Servlet Configuration is a crucial aspect of Java Servlets, allowing for the initialization and parameterization of servlets. Practicing Servlet Configuration MCQs can be incredibly beneficial for testing your knowledge and improving your coding skills.
Servlet Configuration is typically done using the ServletConfig interface, which helps in managing the initialization parameters for a servlet.
You can also explore more about servlet configuration on Oracle’s official documentation.
Servlet Configuration MCQs
Ready to test your knowledge? Let’s dive into some multiple-choice questions to reinforce your understanding of Servlet Configuration.
What is the purpose of the `web.xml` file in a servlet application?
View Answer
Correct Answer: B
The `web.xml` file is the deployment descriptor used to configure servlets, servlet mappings, filters, and initialization parameters.
Which tag in `web.xml` is used to define a servlet?
View Answer
Correct Answer: A
The `<servlet>` tag is used to define a servlet in the `web.xml` file.
What is the default loading behavior for servlets if no `<load-on-startup>` element is specified?
View Answer
Correct Answer: C
By default, a servlet is loaded lazily, i.e., only when it is first requested by the client.
What does the `<load-on-startup>` tag in `web.xml` do?
View Answer
Correct Answer: A
The `<load-on-startup>` tag specifies the order in which servlets are initialized. A lower value indicates a higher priority.
Does the following code correctly map a servlet in `web.xml`?
<servlet>
<servlet-name>ExampleServlet</servlet-name>
<servlet-class>com.example.ExampleServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ExampleServlet</servlet-name>
<url-pattern>/example</url-pattern>
</servlet-mapping>View Answer
Correct Answer: A
Yes, the provided syntax is correct. It uses the `<servlet>` and `<servlet-mapping>` tags with the proper elements `<servlet-name>`, `<servlet-class>`, and `<url-pattern>` to map a servlet correctly.
What is the purpose of the `<init-param>` tag in `web.xml`?
View Answer
Correct Answer: A
The `<init-param>` tag is used to provide servlet-specific initialization parameters.
How can you access an initialization parameter defined in `web.xml` within a servlet?
String paramValue = getServletConfig().getInitParameter("paramName");View Answer
Correct Answer: B
`ServletConfig.getInitParameter()` is used to retrieve initialization parameters for a specific servlet.
Which of the following annotations is equivalent to the `<servlet>` and `<servlet-mapping>` tags in `web.xml`?
View Answer
Correct Answer: C
The `@WebServlet` annotation is used to configure a servlet without needing to edit `web.xml`.
Does the following code correctly define initialization parameters using annotations?
@WebServlet(name = "ExampleServlet", urlPatterns = {"/example"})
@WebInitParam(name = "paramName", value = "paramValue")View Answer
Correct Answer: A
No, the `@WebInitParam` annotation is incorrectly placed. It should be included as part of the `@WebServlet` annotation using the `initParams` attribute.
What is the difference between `ServletConfig` and `ServletContext`?
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Correct Answer: C
`ServletConfig` is specific to a servlet, while `ServletContext` is shared across the application.
Which method of `ServletContext` is used to retrieve application-wide parameters?
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Correct Answer: B
The `getInitParameter(String name)` method of `ServletContext` retrieves application-wide parameters.
What is the role of the `<context-param>` tag in `web.xml`?
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Correct Answer: A
The `<context-param>` tag is used for defining application-wide initialization parameters.
How can you retrieve a context-wide parameter in a servlet?
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Correct Answer: A
The `ServletContext.getInitParameter()` method is used to retrieve context-wide parameters.
Which tag in `web.xml` is used to configure filters?
View Answer
Correct Answer: C
The `<filter>` tag is used to define a filter in `web.xml`.
How can you define a servlet that should handle all requests?
<servlet-mapping>
<servlet-name>YourServletName</servlet-name>
<url-pattern>[pattern_here]</url-pattern>
</servlet-mapping>View Answer
Correct Answer: C
To handle all requests, you must map the servlet to the URL pattern `/*` in `web.xml`. This pattern makes the servlet a universal handler for all incoming requests, while patterns like `/all/*` or `/.*` handle more specific paths.
What is the purpose of the `@MultipartConfig` annotation?
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Correct Answer: A
The `@MultipartConfig` annotation enables a servlet to handle multipart form data, often used for file uploads.
Which method is used to forward a request from one servlet to another?
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Correct Answer: B
`RequestDispatcher.forward()` is used to forward a request to another resource.
What is the purpose of `<error-page>` tag in `web.xml`?
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Correct Answer: A
The `<error-page>` tag is used to configure custom error pages in `web.xml`.
Which HTTP methods can be configured in a servlet?
View Answer
Correct Answer: C
A servlet can handle any HTTP method, including GET, POST, PUT, DELETE, etc.
What does the `<welcome-file>` tag in `web.xml` do?
View Answer
Correct Answer: B
The `<welcome-file>` tag specifies the default file to be served when a directory is requested.
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