J2EE for ABAP Programmers

Transcription

1 J2EE for ABAP Programmers Jeff Gebo SAP Labs, LLC

2 SAP Developer Network sdn.sap.com The central hub for the SAP technology community Everyone can connect, contribute and collaborateconsultants, administrators and developers Focus around SAP NetWeaver and SAP xapps High quality of technical resources Articles, how-to guides, weblogs, collaborative areas, discussion forums and downloads, toolkits and codesamples A collaboration platform, not a one-way street SAP experts from customers, partners and SAP SDN is powered by SAP NetWeaver Built on the SAP Enterprise Portal Featuring collaboration capabilities of SAP Knowledge Management SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 2

3 Learning Objectives Focus: Get a J2EE Overview using the ABAP Paradigm As a result of this Know How Call, you will be able to: Receive an understanding of J2EE and all the J2EE Buzz- Words Understand how J2EE compares to ABAP Learn what SAP is bringing from the ABAP World to the J2EE World Get a learning roadmap to take your ABAP skills to the J2EE world SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 3

4 Agenda Web AS Overview J2EE & ABAP Combined System Architecture Web Programming JSPs ~ BSPs Servlets ~ BSP Controllers Business Programming Enterprise JavaBeans ~ BAPIs/RFMs SAP Enhancements for Business Development Java Dictionary ~ ABAP Data Dictionary Open SQL for Java ~ Open SQL for ABAP Java Development Infrastructure ~ ABAP Development Infrastructure ABAP to J2EE Learning Roadmap! SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 4

5 Two Personalities in One Web Application Server Web Application Server Both, a Fully Compliant J2EE and an ABAP personality Single, comprehensive and unified environment Benefits Preserve customer s investments in the existing software and skills Offer customers business-strength access to J2EE Reducing deployment costs Training Administration & Monitoring System and End User Support Bring Enterprise and Web Developers on One Common Platform Opens Larger Talent Pool J2EE Browser Internet Communication Manager Web Application Server ABAP SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 5

6 SAP Web AS - Server and Cluster Architecture Use a central DB as configuration and application store -> stability Use the Enqueue Server as reliable lock handler -> stability Use the Message Server as message hub -> scalability Use SDM (Software Delivery Manager) to keep track of deployed software components -> supportability J2EE Central Server J2EE Central Instance J2EE Dispatcher Server Processes SDM Central Services Instance Enqueue Service Message Service J2EE Database J2EE Server J2EE Instance J2EE Dispatcher Server Processes SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 6

7 Java Language - J2EE and ABAP Developer Studio Web Dynpro Java Dictionary Open SQL for Java Java language Java VM J2EE Compiler JDK ABAP language ABAP VM Compiler ABAP Runtime ABAP Environment Function Builder Dictionary Transport Organizer Workbench (SE80).. Java is an object-oriented programming language So is ABAP! Source code is compiled into byte-code Byte-code is interpreted by a Java Virtual Machine (JVM) Java is platform independent So is ABAP! J2EE (Java 2 Platform Enterprise Edition) Platform which simplifies and accelerates developing, deploying and managing n-tiered business applications using Java technologies SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 7

8 J2EE vs. ABAP Programming Model Java Web Browser Application Client Web Container JSP Pages / Servlets Enterprise JavaBeans Database J2EE Server ABAP Web Browser SAP GUI Dynpro Technology ICM / ICF BSP Pages / BSP Controllers Module Pool Functions, Classes, & BAPIs Database ABAP Stack SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 8

9 J2EE Architecture Overview Web container Manages the execution of JSP page and servlet components for J2EE applications EJB container Manages the execution of enterprise beans for J2EE applications J2EE Services Foundation for implementation of multi-tier enterprise applications Client Servlets / JSPs EJBs Database Web Container EJB Container JNDI JDBC J2EE Services JMS... J2EE Server SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 9

10 Agenda Web AS Overview J2EE & ABAP Combined System Architecture Web Programming JSPs ~ BSPs Servlets ~ BSP Controllers Business Programming Enterprise JavaBeans ~ BAPIs/RFMs SAP Enhancements for Business Development Java Dictionary ~ ABAP Data Dictionary Open SQL for Java ~ Open SQL for ABAP Java Development Infrastructure ~ ABAP Development Infrastructure ABAP to J2EE Learning Roadmap! SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 10

11 JavaServer Pages (JSP) JSP Page is text file that Is written with markup language (HTML, XML, WML) Includes Java code to bring dynamic information to the page Will always be converted to servlet at execution time JSP Page hides HTTP complexity from programmer Browser HTTP Request Response Servlet generate Web Container page import="flightdemo.generated.*" %> page import="flightdemo.*" %> <html> <head> <title> FlightAnswerList </title> </head> <body> <jsp:usebean id="flightdemobean" scope="session class="flightdemo.flightdemobean" /> <h1> Answers for Request </h1> <table border=1> <th>from</th> <th>to</th> <th>date</th> <th>time</th> <%-- Loop through the list and display the fields for which table headings are defined above --%> <% FlightdemoBean bean = new FlightdemoBean(); bean.setairportfrom("frankfurt"); bean.setairportto("new York"); bean.searchflights(); BapisfldatTypeList list = bean.getfoundflights(); BapisfldatType[] entries = list.toarraybapisfldattype(); for(int i=0; i<entries.length; i++) { %> <tr> <td> <%=" " + entries[i].getairline()%></td> <td> JSP <%=" " + entries[i].getairportfr()%></td> <td>. <%=" " + entries[i].getconnectid()%></td> </tr> <% } %> </table> </body> </html> Java ~ ABAP ljsp ~ Layout of BSP page SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 11

12 HTTP Servlet Servlet is a Java class that Handles HTTP communication Runs on a Web server Generates dynamic Web pages Servlets can directly access resources like Enterprise JavaBeans components, JDBC data sources HTTP Request Servlet HTTP Response Web Container EJB Container Browser Java ~ ABAP Servlet ~ BSP Controller SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 12

13 Agenda Web AS Overview J2EE & ABAP Combined System Architecture Web Programming JSPs ~ BSPs Servlets ~ BSP Controllers Business Programming Enterprise JavaBeans ~ BAPIs/RFMs SAP Enhancements for Business Development Java Dictionary ~ ABAP Data Dictionary Open SQL for Java ~ Open SQL for ABAP Java Development Infrastructure ~ ABAP Development Infrastructure ABAP to J2EE Learning Roadmap! SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 13

14 Enterprise JavaBeans Definition An Enterprise Java Bean is a server-side component that encapsulates the business logic of an application EJBs always execute within an EJB container, which provides system services to EJBs These services include transaction management, persistence, pooling, clustering and other infrastructure EJB EJB EJB EJB EJB EJB EJB Container J2EE Server SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 14

15 Types of Enterprise Beans Enterprise Java Bean Session Bean Entity Bean Messagedriven Bean Stateless Session Bean Stateful Session Bean Containermanaged persistence Beanmanaged Persistence Related to the user session Session bean is not persistent Handles the persistence in a object-oriented manner Represent a business object Message based Receive asynchronous JMS messages SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 15

16 Agenda Web AS Overview J2EE & ABAP Combined System Architecture Web Programming JSPs ~ BSPs Servlets ~ BSP Controllers Business Programming Enterprise JavaBeans ~ BAPIs/RFMs SAP Enhancements for Business Development Java Dictionary ~ ABAP Data Dictionary Open SQL for Java ~ Open SQL for ABAP Java Development Infrastructure ~ ABAP Development Infrastructure ABAP to J2EE Learning Roadmap! SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 16

17 J2EE doesn t cover everything! To adopt J2EE for large business applications, SAP must extend the programming model has to provide new features must integrate existing non-j2ee open standards has to provide a highly productive development infrastructure Business Application Presentation Layer Web Dynpro Servlet JSP Business Layer EJB Persistence Integration Layer Web Services JDBC SQLJ Open SQL SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 17

18 SAP NetWeaver Developer Studio Eclipse is an Open Source project Eclipse consists of a complete Java (J2SE) IDE an open Tool Integration Framework Java J2EE Web Services SAP s Java IDE can be extended by 3rd party Eclipse tools Already many tools available Strong industry drive Your SAP Java IDE can be extended by 3rd party Eclipse tools and own Eclipse tools Java Dictionary Java Persistence Web Dynpro SAP Integration Framework Eclipse Plugin Framework Java ~ ABAP Developer Studio SE80 SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 18

19 J2EE Perspective SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 19

20 Open SQL for Java Java Program Relational Persistence (SQL) Object Relational Persistence Open SQL / SQLJ Open SQL / JDBC EJB (CMP) JDO * Native SQL / JDBC Vendor JDBC Open SQL Engine Open SQL Processor DB Access Layer Table Buffer Table Catalog Statement Cache SQL Trace SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 20 Relational Database System * Not supported in the SAP Web Application Server 6.30 Release

21 Development Environment ABAP/Java ABAP Complete central environment for build and test Instant build Dev. Client Connect Minimal Complete Central Server Continuous integration test Java Independent from central server Availability Dev. Client Dev. Client Dev. Client Performance Offline usage Check in / out Local files and folders Local test environment Central Server SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 21

22 SAP Java Development Process Local Dev. Environment Local File System 1c 3b 3d 2 Local Build Tool Build 3c 3a Developer Studio 4 1a Local J2EE Test System Development Configuration Central Dev. Environment inact act DTR Server 5 1b CBS 6a Change Management System 6b 7a 7b 6d Build 6c 8 Central J2EE Dev System SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 22

23 Deployment and Change Management for Java SAP Service Marketplace Support Production SAP J2EE Engine Software Delivery Manager Package Change Management Service Quality Assurance SAP J2EE Patches SAP NetWeaver Distribution Routes Scheduling & Propagation Distribution Tracking Import Control Version Control Software Archives Development Engine Software Delivery Manager SAP J2EE Developer Studio DTR Build Service Engine Software Delivery Manager Change Requests J2EE Server SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 23

24 Agenda Web AS Overview J2EE & ABAP Combined System Architecture Web Programming JSPs ~ BSPs Servlets ~ BSP Controllers Business Programming Enterprise JavaBeans ~ BAPIs/RFMs SAP Enhancements for Business Development Java Dictionary ~ ABAP Data Dictionary Open SQL for Java ~ Open SQL for ABAP Java Development Infrastructure ~ ABAP Development Infrastructure ABAP to J2EE Learning Roadmap! SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 24

25 ABAP to J2EE Learning Roadmap Learn ABAP Objects and Object Oriented Programming! SAP Offers Course: BC401 ABAP Objects Learn ABAP Web Programming based on ABAP Objects SAP Offers Course: NET200 SAP Web Application Server: Developing BSP Applications Go to to sign up for the above classes Take basic Java Courses Take J2EE Classes be on the look out for SAP s own J2EE Class. SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 25

26 Java & J2EE Resources Web Sites SAP Developer Network Sun's New to Java Site Sun s J2EE Learning Site Java ebook Java World The Server Side SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 26

27 More Java & J2EE Resources Books Core Servlets and JavaServer Pages a great book showing how to do basic J2EE web programming. Java for the Web with Servlets, JSP, and EJB: A Developer's Guide to J2EE Solutions Web development using JSPs, Servlets, and EJBs. Professional EJBs learn all about the details of EJBs. SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 27

28 Summary J2EE defines standards for developing multi-tier enterprise applications J2EE handles many details of application behavior automatically, without complex programming Like transaction and security handling Take your time and follow the learning map if you want to have a crack at it J2EE does not fulfill all requirements for business applications SAP provides a sophisticated infrastructure for development and deployment Take your time and follow the learning map if you to take your ABAP skills to the J2EE world SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 28

29 Questions? Q&A SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 29

30 Copyright 2003 SAP AG. All Rights Reserved No part of this publication may be reproduced or transmitted in any form or for any purpose without the express permission of SAP AG. The information contained herein may be changed without prior notice. Some software products marketed by SAP AG and its distributors contain proprietary software components of other software vendors. Microsoft, WINDOWS, NT, EXCEL, Word, PowerPoint and SQL Server are registered trademarks of Microsoft Corporation. IBM, DB2, DB2 Universal Database, OS/2, Parallel Sysplex, MVS/ESA, AIX, S/390, AS/400, OS/390, OS/400, iseries, pseries, xseries, zseries, z/os, AFP, Intelligent Miner, WebSphere, Netfinity, Tivoli, Informix and Informix Dynamic Server TM are trademarks of IBM Corporation in USA and/or other countries. ORACLE is a registered trademark of ORACLE Corporation. UNIX, X/Open, OSF/1, and Motif are registered trademarks of the Open Group. Citrix, the Citrix logo, ICA, Program Neighborhood, MetaFrame, WinFrame, VideoFrame, MultiWin and other Citrix product names referenced herein are trademarks of Citrix Systems, Inc. HTML, DHTML, XML, XHTML are trademarks or registered trademarks of W3C, World Wide Web Consortium, Massachusetts Institute of Technology. JAVA is a registered trademark of Sun Microsystems, Inc. JAVASCRIPT is a registered trademark of Sun Microsystems, Inc., used under license for technology invented and implemented by Netscape. MarketSet and Enterprise Buyer are jointly owned trademarks of SAP AG and Commerce One. SAP, R/3, mysap, mysap.com, xapps, xapp, SAP NetWeaver and other SAP products and services mentioned herein as well as their respective logos are trademarks or registered trademarks of SAP AG in Germany and in several other countries all over the world. All other product and service names mentioned are the trademarks of their respective companies. SAP AG 2003, TechED Basel 2003, JAVA102_EMEA, Benny Schaich/Jeff Gebo 30