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Dual Stack Architecture 18 October 2010
Key architecture principles of Dual stack systems • The central instance of an AS ABAP+Java system can be recognized by the following processes: ABAP-MS, enqueue work process and SDM. The central services of the Java runtime environment (Java-MS, Java-ES) are also provided in the Java central services instance here. All other instances are usually called dialog instances. • Since both runtime environments are capable of answering requests via web protocols,the Internet Communication Manager must now decide whether the request is addressed to the ABAP or the Java runtime environment. It decides this by means of the URL of the request. In case of a request to the ABAP runtime environment,for example, the call of an ABAP web dynpro, the ICM forwards the request to the ABAP dispatcher and the work processes respond to the request. If the request is a request for the Java runtime environment, for example, the call of a Java Server Page (JSP), the ICM forwards the request to the Java dispatcher and one of the server processes responds to the request. • In an AS ABAP+Java system, data is also kept in separate database schemas (but in the same database installation). That is, work processes can only access ABAP data and server processes can only access Java data. In the data exchange, both runtime environments then communicate using the SAP Java Connector (JCo). This communication is necessary, for example, if billing data that is stored in the ABAP data schema is supposed to be displayed in a Java user interface. • The SAP JCo is integrated into the AS Java and is also used when an AS Java system has to communicate with a remote AS ABAP system. 18 October 2010
Page 1 and 2: SAP BASIS Introductory Training Pro
Page 3 and 4: AS JAVA Architecture & Processes 18
Page 5 and 6: SAP AS JAVA Instance Central Instan
Page 7 and 8: Summary of AS JAVA Processes The fo
Page 9: AS JAVA Architecture • In AS Java
Page 13 and 14: Details on request processing • T
Page 15 and 16: Transaction Processing in AS JAVA 1
Page 17 and 18: Details on Managers & Services •
Page 19 and 20: Open SQL for JAVA • If the Java p
Page 21 and 22: The JAVA Instance Concept • SAP N
Page 23 and 24: Request Processing by the dispatche
Page 25 and 26: Message & Enqueue Service • The m
Page 27 and 28: Services in the AS JAVA • The ser
Page 29 and 30: Startup & Shutdown Of AS JAVA Insta
Page 31 and 32: Sequence of Startup • The SAP Sys
Page 33 and 34: Stopping AS JAVA in UNIX • The st
Page 35 and 36: Starting/Stopping a pure AS JAVA in
Page 37 and 38: Process Information 18 October 2010
Page 39 and 40: SMICM Details • In the case of SA
Page 41 and 42: Start/Stop in UNIX • For SAP syst
Page 43 and 44: Details on the Framework • SAP pr
Page 45 and 46: Location in Windows 18 October 2010
Page 47 and 48: JCMON Tool • The JCmon tool can b
Page 49 and 50: Logs & Trace Files in AS JAVA 18 Oc
Page 51 and 52: Administration & Configuration Tool
Page 53 and 54: Features of the Config Tool • The
Page 55 and 56: Visual Administrator • With the V
Page 57 and 58: Memory Management in AS JAVA • Th
Page 59 and 60: Explanation of the Term “Generati
Page 61 and 62:
Exercise EXERCISE • Login to the
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