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Lecture 16 Other Issues in Java

Lecture 16 Other Issues in Java. Outline. Case study Financial institution Java Wallet Rapid Development RMI. Java and Business Perspective. Competitive forces in financial institution to adopt new technology Increasing high fixed cost

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Lecture 16 Other Issues in Java

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  1. Lecture 16Other Issues in Java

  2. Outline • Case study • Financial institution • Java Wallet • Rapid Development • RMI

  3. Java and Business Perspective • Competitive forces in financial institution to adopt new technology • Increasing high fixed cost • Generating high-margin revenues and lowering costs of providing services • The need for improved technology • The availability of standard payment protocols • The system reliability for 24 X 7 operations • The flexibility of the platform to absorb new capabilities

  4. Evolution of Technology • Banks were among the earliest pioneers • to apply computing technology to their • business 1966 1976 1986 1996 Back office Teller Desk top ATMs Off-site interface

  5. Technology Needs of the Financial Service • Major issues • Open systems • More than 200 different proprietary systems are inefficient • IT professionals want open standards and protocols • Hardware platform • Use the same hardware in a variety of client locations • Run applications in various systems • Provide all the advantages of a rapid application development • Allow reuse of the same code based in variety of different applications along with object-oriented technology • Allows to take advantage of the platform independence provided by Internet technologies

  6. Technology Needs of the Financial Service • Movement toward electronic payment mechanism • Paper based: $.60/transaction to process • Electronic based: $.02/transaction to process • Data warehousing • Huge transactional databases contain information about customer purchasing habits • Valuable what services to provide

  7. Limitations Implementing New Technologies • Security • Protection of private data • Authentication • Reliability • Flexibility • Financial institution doesn’t know what applications are going to win

  8. Java Solutions: Java Commerce • Java commerce provides a complete infrastructure for Internet-based electronic commerce • support all standards and payment protocols running concurrently in the same environment • Run everywhere (Netscape, IE, hand-held devices • Reduce costs, efforts, and time • Java commerce consists of the Java Electronic Commerce Framework (JECF), which comprises the related technologies of the Java Wallet and Commerce Java Bean

  9. Java Wallet • A family of products written in the JavaTM programming language that are designed to enable secure electronic commerce operations • Provides a single, unambiguous user interface for electronic transaction • The merchant offers goods or services for sale on the WWW using applets which adhere to the architecture built into the Java wallet

  10. Java Wallet • Key concepts and components • Gateway security model • Foundation of the Java Wallet’s security • Commerce JavaBeans • Component that extend the JavaBean model • Cassettes • Designed Java archive (JAR) files that may contain JavaBean as well as the resources required for their operations • Java Commerce Message • A block of text sent from a commerce service to the user

  11. Java Wallet • Exploit weakness in the Java Wallet • Pickpocket • An applet which steals information and passwords from the Java wallet • BookMarker • An applet which alter the berhavior of the Java Wallet • DemonDialer • An applet which can use your modem

  12. Java Wallet: Related Technologies • Java Commerce API • Provides foundation services that allow developer to easily create new electronic commerce application • Rapid commerce component development • Commerce JavaBeans Component • A reusable commerce component that meets specific interface requirements

  13. Rapid Application Development • JavaBean technology is a significant extension and enhancement of the Java Language • Enable programmer to rapidly build applications by assembling objects and testing them during design time • AWT and Swing user interface classes are JavaBean component

  14. RAD • RAD is a software development technology introduced in the 1980s • It has been successfully and efficiently implemented in development tools • Visual Basic, Delphi, Power Builder, Oracle Developer 2000 • Using a RAD tool, projects can be developed quickly and efficiently with minimum coding • The key elements in a Java RAD tool are the JavaBean components

  15. Swing Set Demo

  16. RAD with Swing Components

  17. Remote Method Invocation • RMI is the Java Distributed Object Model for facilitating communication among distributed objects • RMI technology provides a framework for building distributed Java systems • A Java object can invoke a method in an object on another system on the network • RMI is an evolution of the client/server architecture • A client is a component that issues requests for services • A server is a component that delivers the requested services

  18. How Does RMI Work? • The interface must extend the java.rmi.Romote interface • Steps • The client send method parameters to the server • The server received the method parameter and executes the method • The server sends the result back to the client • The client received the results

  19. How Does RMI Work? Client Server Client object Server stub Server skeleton Server object implementation Return Server Stub Register Server object RMI registry Look for Server Object Java RMI use a registry to provide naming services for remote objects, and use The stub and skeleton to facilitate communications between client and server

  20. Stub and Skeleton • Stub • Resides on the client machine • Contains all the reference information the client needs to know about the server object • Invokes a method that is encapsulated in the stub • Is responsible for sending parameters to the server and for receiving the result from the server and returning it to the client • Skeleton • Communicates with sthe stub on the server side • Receives parameters from the client • Passes them to the server for execution • Return the result to the stub

  21. Developing RMI in JBuilder

  22. Developing RMI in JBuilder

  23. Developing RMI in JBuilder

  24. Servlet • Servlet technology is designed for use with the HTTP protocol • Servlets are Java programs that run on a Web server • CGI provides a simple approach for creating dynamic Web applications • Accept user request, process it on the server side, and return responses to Web browser • CGI is slow down when handling a large number of request simultaneously, because the Web server spawns a process for executing each CGI program

  25. Servlet • Java Servlets are one of technologies solving the problems • Servlets are executed upon request from a Web browser • Run inside a servlet container

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