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Processing User Requests in Java • A web browser is the standard user interface for AS Java. A user request for AS Java is usually an HTTP request that is received by the Java dispatcher. The dispatcher forwards the processing requests to one of the server processes of “its” instance. 18 October 2010
Details on request processing • The actual processing takes place in the server process, whereby the user who sent the request is usually assigned the same server process again for the next request. • The dispatcher and server processes of AS Java are also called nodes. All processes of AS Java together with the database schema form the Java cluster. In contrast to the processes of AS ABAP (excluding the ICM), the cluster nodes of AS Java are multithreaded. This means that an AS Java process consists of many threads and one request can be processed in each thread. Hence, one server process always processes many user requests in parallel. • To process user requests it is often necessary to read data from the Java schema of the database or to write to it. To do so, each server process is connected multiple times to the Java schema of the database via a connection pool (DB pool). • Once processing is complete, the processing result from the server processes is returned to the web browser via the dispatcher. 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 and 10: AS JAVA Architecture • In AS Java
Page 11: Key architecture principles of Dual
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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