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2021 Jun 1Z0-868 answers
Q71. As part of your SOA infrastructure, you are interested in implementing a client that can request information about businesses worldwide from a UDDI registry. Which Java EE API provides interfaces for gathering data about these businesses?
A. StAX
B. JAXB
C. JAXP
D. JAXR
Answer: D
Q72. What are two advantages of the Business Delegate pattern? (Choose two.)
A. increases the scalability of remote services
B. decouples presentation logic from business logic
C. avoids unnecessary invocation of remote services
D. hides underlying communication details of the service
E. enables transparent persistent storage of the business entity
Answer: C,D
Q73. In which three situations is it best to use messaging with the Service Activator? (Choose three.)
A. when high availability is required
B. when you want to carry data across a tier
C. when interactive client conversations are required
D. when subtasks can be processed in random order
E. when you need to listen for and process messages
F. when you need to publish messages to multiple receivers
Answer: D,E,F
Q74. A Java EE application needs to receive XML documents and send back synchronous responses. The incoming XML documents are validated by the application against one of three distinct XML schemas. What is the simplest mechanism with the least overhead to accomplish this task?
A. RMI over IIOP
B. XML over HTTP
C. JAVA IDL/CORBA
D. a SOAP web service
Answer: B
Q75. As a project architect, you are selecting technologies for a complex, n-tier web application's virtual platform. At this stage in the project, which two technologies should be of primary consideration? (Choose two.)
A. RMI B. Linux C. JDBC D. Firefox
E. Tomcat
Answer: A,C
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Q76. Interceptors provide a way of refactoring code shared by multiple EJB 3 components into a single unit. This is particularly appealing when the code in question can be described as implementing a specific aspect, for example, having a well-defined purpose that can be described in a concise way. Which two actions can be implemented as interceptors? (Choose two.)
A. logging the IP addresses of all clients of a web application
B. computing sales tax based on customer ZIP code for a variety of purchase operations
C. publishing to a JMS topic the arguments to any successful method invocation on an EJB component
D. computing a discount percentage based on a customer's profile and the contents of the customer's shopping cart
E. logging the identity of any authenticated clients to any of the business methods defined by a set of EJB components
F. ensuring that the clients of a web service implemented as a stateless session bean are authorized to access its operations, based on a WS-Security SOAP message header
Answer: C,E
Q77. You work for a small IT shop. The developers are responsible for deploying production applications. All of the connection and resource parameters are distributed in the Java source code. Your IT shop has a limited infrastructure so there have been few issues with pushing production applications. Your IT shop has been purchased and is now reselling Java products to customers. You now have dedicated development, testing, staging, and production environments. A new requirement states that these applications must support rapid deployment to each environment. What is the best solution?
A. refactor the Java application to use JNDI names and resource references
B. identify a build engineer that has the responsibility of modifying the constant class for each deployment
C. set your connection properties in a constants class to consolidate connection and resource parameters
D. identify the environment parameters for connection and resources and make them readily available to developers
Answer: A
Q78. What directly addresses a non-repudiation requirement?
A. input validation
B. identification and authentication
C. certificate authority (CA) certificates
D. encryption of a hash using a private key
Answer: D
Q79. An organization has several Java EE web services. There is a new requirement to write the SOAP headers for each incoming web service request to a log file. What is the best way to log these incoming headers using Java EE APIs?
A. use a JAX-RPC client to access the SOAP headers and write them to a log
B. use a JAX-WS handler to extract the SOAP headers and write them to a log
C. use JMS to extract and route the SOAP headers to an MDB that writes them to a log
D. use JAXB to parse the SOAP headers in the service implementation classes and write them to a log
Answer: B
Q80. A teenage fashion web site employs a dozen web designers skilled in graphic design, HTML, and some JavaScript experience. You were hired by the company to create an architecture that includes a small amount of dynamic content to integrate the web site with the company's order entry system. Which three web technologies would you train the web designers to use to create dynamic pages? (Choose three.)
A. the servlet API
B. JSP with standard tags
C. JSP with JSTL database tags
D. building new JSF components
E. standard JSF component tags
F. JSP with the Expression Language
Answer: B,E,F