Question 1

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 of f:ajax element specifies a space-separated list of element ids-the values of these elements are submitted as part of the Ajax request. This attribute is used to identify which components to process and update during an Ajax request. The "render" attribute specifies a space separated list of client ids, specifying which components to update with the response of the Ajax request. The "send" attribute is not a valid attribute for f:ajax element. The "display" attribute is also not a valid attribute for f:ajax element.

Question 2

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 specifically displays a collection's data in tabular format. The other options are not meant for this specific purpose.

Question 3

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 of the f:ajax element specifies a space-separated list of element ids for the elements that should be updated via partial page updates. The "execute" attribute is used to define which elements trigger the Ajax request. The "send" attribute is used to send additional parameters with the Ajax request, and the "display" attribute does not exist in the f:ajax element.

Question 4

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

Accepted Answer

The answer of The browser's ________ enables the asynchronous exchanges...

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 use 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

Using a connection pool allows for efficient use of database connections and prevents the need for constantly creating and closing connections for each client request. It also prevents the depletion of resources on the server. Option A would lead to resource depletion and Option C is not true, as many web apps require database connectivity. Option D is not a valid answer.

Question 6

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

Accepted Answer

The correct annotation is @Resource, which is used to inject a DataSource into a managed bean. @DataSource is not a valid annotation, and @DataSourceDefinition is used to define a DataSource in a deployment descriptor, not to inject it into a managed bean.

Question 7

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

Separating the user interaction portion of an application from its server interaction means that both can proceed independently and simultaneously without waiting for each other. This is achieved through asynchronous communication in parallel. Option A is incorrect because synchronous communication implies that one part of the application has to wait until the other part has completed its task before proceeding. Option C is incorrect because some interaction is necessary for the application to work, even if it's just sending data back and forth between the client and server. Option D is incorrect because there is a correct answer.

Deck 29: Javaserver Faces Web Apps