J2EE Examination Study Notes

J2EE Examination Study Notes

• Subject Code: 2035001
• Faculty Code: 003
• Time: 2½ Hours
• Total Marks: 70

Question 1

• (a) One or Two Word Answers:

  • Web Server: A software application that serves web pages to users.
  • Session: A temporary communication established between a user and a web server, typically used to maintain a user's state across multiple requests.
  • Java Messaging Service (JMS): A messaging standard for Java applications, enabling asynchronous communication between applications.
  • Java Database Connectivity (JDBC): An API that provides a standard way for Java programs to access and manipulate databases.

• (b) Attempt Following (Any 1):

  • Explain Tomcat: It is a widely used, open-source web server and servlet container, primarily designed for use with Java Servlets and Java Server Pages (JSPs).
  • J2EE Advantages:
    • Platform Independence: J2EE applications can run on any platform that supports the Java Virtual Machine (JVM).
    • Robustness: The J2EE platform provides various features for security, error handling, and transaction management.
    • Scalability: J2EE applications can be easily scaled to handle large numbers of users.

• (c) Answer Following (Any 1):

  • JDBC type-I Driver: This is a bridge driver which establishes a direct connection to the database using the database's own native protocol.
  • Connection String: A string that contains all necessary information for a Java program to connect to a specific database.

• (d) Answer in Detail (Any 1):

  • JDBC Drivers:

    • Type 1 (JDBC-ODBC Bridge): Uses ODBC (Open Database Connectivity) to connect to a database, relying on the database's own ODBC driver.
    • Type 2 (Native API Partly Java Driver): Uses a combination of Java code and the database's native API libraries.
    • Type 3 (Net-Protocol Driver): Uses a network protocol to communicate with a database server.
    • Type 4 (Pure Java Driver): Completely written in Java, interacting directly with the database server using its native protocol.

  • Enterprise Architecture Styles:

    • Layered Architecture: Separates application functionality into distinct layers (e.g., presentation, business, data access) to enhance modularity and maintainability.
    • Microservices Architecture: Divides a large application into smaller, independent services that communicate with each other using APIs.
    • Event-Driven Architecture: Involves asynchronous communication based on events, enabling loose coupling and scalability.

Question 2

• (a) One or Two Word Answers:

  • Java Naming and Directory Interface (JNDI): A standard API for accessing and managing directory services.
  • Remote Method Invocation (RMI): Allows objects on one Java Virtual Machine (JVM) to invoke methods on objects running on another JVM.
  • Servlet: A Java program that extends the functionality of a web server, typically used to handle client requests and generate dynamic web content.
  • Web Deployment Descriptor File (web.xml): A configuration file that contains settings relevant to web applications, such as servlet mappings and deployment parameters.

• (b) Answer Following (Any 1):

  • J2EE APIs (Application Programming Interfaces):

    • Java Servlet API
    • JavaServer Pages (JSP) API
    • Java Message Service (JMS) API
    • Java Transaction API (JTA)
    • Java Naming and Directory Interface (JNDI) API
    • JDBC API

  • request.getParameter(): A method in the Servlet API that retrieves values from HTTP request parameters.

• (c) Answer Following (Any 1):

  • web.xml File: A configuration file used in web applications to define servlets, their mappings to URLs, and other deployment settings.
  • Request vs Response: In web development, a request is sent from a client (e.g., web browser) to a server, while a response is sent back from the server to the client.

• (d) Answer in Detail (Any 1):

  • web.xml File: It is a crucial configuration file used in web applications to define deployment configurations and settings. It contains information about:
    • Servlets: Mapping to specific URLs, initialization parameters, and lifecycle settings.
    • JSP Pages: Configuration for their lifecycle and handling.
    • Filters: For pre-processing and post-processing of requests and responses.
    • Listeners: To receive events that occur within the application.
    • Security Constraints: Defining authorization rules for accessing specific resources.
    • Data Sources: Defining connections to databases.
    • Welcome Files: Specifying default pages to be displayed when visiting the application.

Prepare for your upcoming J2EE examination with these comprehensive study notes covering key concepts and terms. This quiz focuses on critical elements like Web Servers, JMS, JDBC, and Tomcat, providing a solid foundation for Java EE applications.