Which two from the web application deployment descriptor are valid？（）

多项选择题You want to create a valid directory structure for your Java EE web application， and you want to put yourweb application into a WAR file called MyApp.war. Which two are true about the WAR file？（）

A.At deploy time， Java EE containers add a directory called META-INF directly into the MyApp directory.
B.At deploy time， Java EE containers add a file called MANIFEST.MF directly into the MyApp directory.
C.It can instruct your Java EE container to verify， at deploy time， whether you have properly configured your application’s classes.
D.At deploy time， Java EE containers add a directory call META-WAR directly into the MyApp directory.

单项选择题Servlet A forwarded a request to servlet B using the forward method of RequestDispatcher. What attributein B’s request object contains the URI of the original request received by servlet A？（）

A.REQUEST_URI
B.javax.servlet.forward.request_uri
C.javax.servlet.forward.REQUEST_URI
D.javax.servlet.request_dispatcher.request_uri
E.javax.servlet.request_dispatcher.REQUEST_URI

单项选择题Given a Filter class definition with this method： 21.public void doFilter（ServletRequest request， 22.ServletResponse response， 23.FilterChain chain） 24.throws ServletException， IOException { 25.  insert code here26. } Which should you insert at line 25 to properly invoke the next filter in the chain，or the target servlet if thereare no more filters？（）

A.chain.forward（request， response）；
B.chain.doFilter（request， response）；
C.request.forward（request， response）；
D.request.doFilter（request， response）；

单项选择题Click the Exhibit button.  Given the web application deployment descriptor elements： 11. 12.ParamAdder 13.com.example.ParamAdder 14.... 31. 32.ParamAdder 33.Destination 34.... 55. 56.Destination 57. dest Destination 58. What is the result of a client request of the Source servlet with no query string？（）

A.The output "filterAdded = null" is written to the response stream.
B.The output "filterAdded = addedByFilter" is written to the response stream.
C.An exception is thrown at runtime within the service method of the Source servlet.
D.An exception is thrown at runtime within the service method of the Destination servlet.

多项选择题Given： String value = getServletContext（）.getInitParameter（ foo ）； in an HttpServlet and a web applicationdeployment descriptor that contains： <context-param> <param-name>foo< param-name> <param-value>frodo< param-value> < context-param> Which two are true？（）

A.The foo initialization parameter CANNOT be set programmatically.
B.Compilation fails because getInitParameter returns type Object.
C.The foo initialization parameter is NOT a servlet initialization parameter.
D.Compilation fails because ServletContext does NOT have a getInitParameter method.
E.The foo parameter must be defined within the  element of the deployment descriptor.