SCWCD(310-083)單項選擇題每日一練(2019.01.16)

Servlet A receives a request that it forwards to servlet B within another web application in the same webcontainer. Servlet A needs to share data with servlet B and that data must not be visible to other servlets inA’s web application.
In which object can the data that A shares with B be stored？（）

The Squeaky Bean company has decided to port their web application to a new J2EE 1.4 container. Whilereviewing the application， a developer realizes that in multiple places within the current application， nearlyduplicate code exists that finds enterprise beans.
Which pattern should be used to eliminate this duplicatecode？（）

You have built a web application with tight security. Several directories of your webapp are used for internal purposes and you have overridden the default servlet to send an HTTP 403 status code for any request thatmaps to one of these directories. During testing， the Quality Assurance director decided that they did NOTlike seeing the bare response page generated by Firefox and Internet Explorer. The director recommendedthat the webapp should return a more user-friendly web page that has the same look-and-feel as the webapp plus links to the webapp’s search engine. You have created this JSP page in the /WEB-INF/jsps/error403.jsp file. You do NOT want to alter the complex logic of the default servlet.
How can you declarethat the web container must send this JSP page whenever a 403 status is generated？（）

You are creating an error page that provides a user-friendly screen whenever a server exception occurs.You want to hide the stack trace， but you do want to provide the exception’s error message to the user sothe user can provide it to the customer service agent at your company. 
Which EL code snippet inserts thiserror message into the error page？（）