1. 1. Introducing Java Computing  What is Java Computing?  Why Java Computing?  Enterprise Java Computing  Java and Internet Web Server

2. What is Java? (Slide from JavaOne conference)

12. Java Computing n Java Computing is an end-to-end, secure network computing solution based on distributed Java applications and low-cost Java network devices. n Java Computing components Java Applications/Applets Java-enabled browsers Java Virtual Machine Java APIs Java development tools Java servers (servlets) Java network management JavaOs and JavaChip Others to come. (Java Media, Java Commence, Java Card, …)

13. Why use Java? (Slide from JavaOne conference)

20. What is Java? (Slide from JavaOne conference)

23. Why use Java? (Slide from JavaOne conference)

24. Java™ in the Enterprise (From JavaOne conference) n Java™ in the Enterprise n Access to existing systems JDBC™, O/R Mapping n Distributed Java computing (RMI) n Heterogeneous connectivity (JavaIDL) n Enterprise services Java Naming and Directory Interface, Java Management API, Java Message Service n Server platform Servlets, Enterprise JavaBeans™

25. Java in the Enterprise n Productivity 1. Programming: Power, safety 2. Cost of ownership: Administration, installation 3. Hardware platform independence: NC, PC, server 4. Java Enterprise Platform: "Write Once, Run Anywhere™ n Java Everywhere in 3-Tier Systems 1. Client/Browser 2. Middleware 3. Server

26. JDBC: Java access to SQL databases n Platform-independence, database-independence JDBC in JDK 1.1 n Multiple styles of JDBC drivers available 100% Pure Java JDBC drivers are best Over 20 already available n Row set manipulation planned

27. Java Remote Method Invocation (RMI) n Distributed applications written entirely in Java n Enables distributed Java objects to interact n Behavior can move between Java Virtual Machines(VMs) n Distributed polymorphism and garbage collection n In JDK 1.1

28. CORBA: Common Object Request Broker Architecture n Object management group Over 700 companies n Object Request Broker (ORB) - Client invokes method on server object - ORB middleware transparently handles request Access new or existing applications and servers n Additional services defined based on ORB

29. OMG CORBA and Java IDL n Object Request Broker (ORB) - Client invokes method on server object - ORB middleware transparently handles request Access new or existing applications and servers n Java IDL API for heterogeneous remote procedure call n Java ORB n IIOP: Standard CORBA network protocol n IDL:Specify object interfaces Generate interface definitions Portable stubs and skeletons

30. Java Transaction Service n Java API for OMG object transaction service n Ensure transactional interoperability on Java Platform n Targeted at implementers of transaction managers and resource managers; Support transactional standards n Reference spec announced; Collaboration with IBM, Tandem and BEA.

31. Java Enterprise Services n Java Naming and Directory Interface (JNDI) Unified interface to naming and directory n Java Management API (JMAPI) Standard open interface for network management n Java Message Service New initiative: API and enabling technology for enterprise messaging.

32. Java Server: services for the web n Servlet API--like applet but for server Java program extending network server n Server Toolkit Constructs for writing services n Java Web Server In beta n Java Application Server Provide back-end services for NCs

33. Server Platform

34. Beanstalk n Environment for running service beans n Java API for Transaction Server Manages interaction between service beans and Communications Other service beans Java enterprise services Transaction Server

35. HTTP Web Servers

36. Network Architecture: HTTP Web Client Browser URL Java Applet Web Server ____ Java Servlets ____ HTML files ____ DB Application Server _____ Programs/ Scripts HTTP (TCP/IP) CGI JDBC Native Driver NSAPI/ ISAPI

37. TCP/IP Network Architecture Application Layer Telnet, HTTP, FTP, SMTP, SNMP Transport Layer TCP, UDP Network Layer IP Physical Layer Ethernet, X.25, Token Ring, PPP Sending Data Receiving Data

38. TCP/IP and Networking Terms n Host: An individual machine on a network. Each host on a TCP/IP network has at lease one unique address (IP number). n Hostname: A symbolic name that can be mapped into an IP number. Most host use DNS (Domain Name Service) to do the mapping. n IP number: A unique address for each hosts on the Internet. The IP number is usually referred as the IP address of a host. The number consists of a network part and a host part. IPv4 address is 32-bit long and used to be expressed as four decimal numbers separated by period such as 136.176.5.10 n Packet: A single message sent over a network. Packet usually refers to data at network layer, as the datagram is used to refer to the data at transport layer.

39. TCP/IP and Networking Terms n Protocol: A set of data formats and messages used to transmit information. n Protocol stack: The set of protocol layers that provides network functionality. Some of the network protocol stack other than TCP/IP are: OSI (Open Systems Interconnection), IBM SNA (System Network Architecture), DecNet, and Novel Netware. n Socket: A communication endpoint. In TCP/IP, a socket usually is identified by a unique pair consists of the source IP address and port number, and destination IP address and port number. n Intranet: A TCP/IP network that connected to the Internet through a firewall.