Question 1

The ________ annotation allows you to inject a DataSource into a managed bean.&#10;A) @Resource.&#10;B) @DataSource.&#10;C) @Database.&#10;D) None of the above.

Accepted Answer

The @Resource annotation allows you to inject a DataSource into a managed bean.

Question 2

Ajax separates the user interaction portion of an application from its server interaction, enabling both to proceed ________.&#10;A) synchronously.&#10;B) asynchronously in parallel.&#10;C) without any interaction whatsoever.&#10;D) None of the above.

Accepted Answer

Ajax allows the user interaction portion of the application to proceed asynchronously and in parallel with the server interaction, resulting in a more responsive and efficient application.

Question 3

The ________ element displays a collection's data in tabular format.&#10;A) h:table.&#10;B) h:collection.&#10;C) h:dataTable.&#10;D) None of the above.

Accepted Answer

The h:dataTable element is specifically designed to display data in a tabular format. The other options, h:table and h:collection, are not valid XHTML tags and are therefore not correct choices.

Question 4

The ________ enables the asynchronous exchanges with the web server that make Ajax applications so responsive.&#10;A) HttpRequestObject.&#10;B) XMLHttpRequest.&#10;C) XMLHttpRequestObject.&#10;D) None of the above.

Accepted Answer

The answer of The ________ enables the asynchronous exchanges with...

Question 5

Which of the following is true&#10;A) You should maintain a separate database connection for each client request.&#10;B) You should maintain a connection pool that allows the server to manage a limited number of database connections and share them among requests.&#10;C) You should never connect to databases from web apps.&#10;D) None of the above.

Accepted Answer

Maintaining a separate database connection for each client request (option A) is not efficient as it can lead to a high number of connections being established and often causes scaling issues. On the other hand, option C is incorrect as it is common practice to connect to databases from web apps. Option B, maintaining a connection pool, is the most efficient way to manage database connections in web apps, allowing the server to manage a limited number of connections and share them among requests, optimizing resource allocation and reducing overhead.

Question 6

The f:ajax element's ________ attribute specifies a space-separated list of element ids-the values of these elements are submitted as part of the Ajax request.&#10;A) execute.&#10;B) render.&#10;C) send.&#10;D) display.

Accepted Answer

The "execute" attribute is used to specify a space-separated list of element ids whose values will be submitted as part of the Ajax request. This allows for selective submission of form data in Ajax requests, which can be useful for reducing response times and minimizing bandwidth usage. The "render" attribute, on the other hand, is used to specify a space-separated list of element ids whose contents will be replaced with the Ajax response. The "send" and "display" attributes are not valid f:ajax attributes.

Question 7

The f:ajax element's ________ attribute specifies a space-separated list of element ids for the elements that should be updated via partial page updates.&#10;A) execute.&#10;B) render.&#10;C) send.&#10;D) display.

Accepted Answer

The "render" attribute is used to specify which elements should be updated via partial page updates. The "execute" attribute is used to specify which components should be processed (i.e. have their values submitted) during the Ajax request. The "send" attribute is not a valid attribute for the f:ajax element. The "display" attribute is also not a valid attribute for the f:ajax element.

Deck 27: Javaserver Faces Web Apps: Part 2