When adding a element to a web application deployment descriptor， the inclusion of which sub-element requires the definition of an error page（）？

In which three directories， relative to a web application’s root， may a tag library descriptor file reside when deployed directly into a web application？（）

A. /WEB-INF
B. /META-INF
C. /WEB-INF/tlds
D. /META-INF/tlds
E. WEB-INF/resources
F. /META-INF/resource

Which two prevent a servlet from handling requests.？（）

A. The servlet’s init method returns a non-zero status.
B. The servlet’s init method throws a Servlet Exception
C. The servlet’s init method sets the Servlet Response’s context length to 0
D. The servlet’s init method sets the Servlet Response’s content type to null.
E. The servlet’s init method does NOT return within a time period defined by the servlet container.

Given a web application in which the request parameter product ID contains a product identifier.Which two EL expressions evaluate the value of the product ID？（）

A. ${product ID}
B. ${param.productID}
C. ${params.productID}
D. ${params.productID[1]}
E. ${paramvalues.productID}
F. ${paramValues.productID[0]}
G. ${pageContext.request.productID}

Which the three are true about servlet filters？（）

A filter must implement the destroy method
B. A filter must implement the doFilter method
C. A servlet may have multiple filters associated with it
D. A servlet that is to have a filter applied to it must implement the javax.servlet.FilterChain interface
E. A filter that is part of a filter chain passes control to the next filter in the chain by invoking the filterChain forward method
For each element in the web application deployment descriptor， multiple instances of a filter may be created by the web container

A developer is designing a web application which extensively uses EJBs and JMS. The developer finds that there is a lot of duplicated code to build the JNDI contexts to access the beans and queues. Further， because of the complexity， there are numerous errors in the code. Which J2EE design pattern provides a solution for this problem？（）

A. Command
B. Transfer object
C. Service locator
D. Session Façade
E. Business delegate
F. Data access object

A custom JSP tag must be able to support an arbitrary number of attributes whose names are unknown when the tag class is designed. Which two are true？ （）

A element in the echo tag LTD must have the value JSP
B. The echo tag handler must define the setAttribute （String key， String value） method
C. The true element must appear in the echo tag TLD
D. The class implementing the echo tag handler must implement the javax.sevlet.jsp.tagext.IterationTag interface
E. The class implementing the echo tag handler must implement the javax.sevlet.jsp.tagext.DynamicAttributes interface

Which the JSTL code snippet can be used to import content from another web resource？（）

E. Importing cannot be done in JSTA standard action must be used instead.

Which thethree are valid URL mappings to a servlet in a web deployment descriptor？ （）

A. */*
B. /*.do
C. myServlet
D. /Myservlet
E. /MyServlet/*
F. MyServlet/*.i

Given that a scoped attribute cart exists only in a user’s session， which two， taken independently， ensure the scoped attribute cart no longer exists？（）

A. ${cart = null}



E. cart

G. ${cart}