e-business Application Solutions on OS/390 Using ... - IBM Redbooks

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You can do almost anything using sockets. Basically, sockets are under the covers of other protocols too. However, note that when using sockets, you will have to take care of recovery, security and, eventually, ASCII/EBCDIC conversion yourself. Most subsystems on OS/390 have a socket interface that can be accessed directly from a Java applet or application running on the client, but you can also create a Java application server that handles the client requests and communicates with the back-end systems on OS/390. As previously mentioned, ideally the Java application server should be a multithreaded application and connectors should be used to communicate with the back-end systems. 2.3 Accessing Back-End Systems on OS/390 It is difficult to consider e-<strong>business</strong> applications without also thinking of reusing existing data and programs on OS/390. It is estimated that about 70% of the mission-critical enterprise data is stored on mainframes running OS/390. Today, a variety of Java APIs and connectors are available to access the subsystems of OS/390. Most of them can be used to not only directly access the subsystem from the client, but also access it from a servlet or JavaServer Page (JSP) running in the WebSphere <strong>Application</strong> Server or Lotus Domino Go Webserver Release 5.0. They all support access from a Java application or a Java application server running on OS/390. Figure 10 gives the status of the various APIs, or e-<strong>business</strong> connectors, as of the date of publication of this book. Function Available/planned Direct access from: DB2 JDBC Available now OS/390 applications/ servlets SQL/J Downloadable CICS CICS Gateway for Java Available now OS/390 appl./ servlets and TCP/IP clients JCICS GA planned for 1Q/99 CICS/390 Java Transactions IMS IMS TCP/IP OTMA Available now OS/390 appl./ servlets Connection and TCP/IP clients MQSeries MQSeries Client for Java MQSeries bindings for OS/390 Available now Available now in Beta OS/390 appl./ servlets and TCP/IP clients OS/390 appl./ servlets VSAM files Record I/O Technology Preview OS/390 appl./ servlets C/C++ modules JNI Available OS/390 appl./ servlets ASM, COBOL, PL/1 JNI Available Via JNI (C stub) GUI AWT via X11 Remote AWT Available Downloadable Figure 10. Available Java APIs/Connectors for Accessing Back-End Systems on OS/390 16 e-<strong>business</strong> <strong>Application</strong> <strong>Solutions</strong> on OS/390 Using Java Vol. I N/A N/A
In this redbook we document most of the connection scenarios that have not yet been documented in Integrating Java with Existing Data and <strong>Application</strong>s on OS/390, SG24-5142. Chapter 2. Java Client/Server 17
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To run the Performance Analyzer on
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To download the javaInstall.data fi
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Figure 41. Setting Up a Host Sessio
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Figure 45. javaInstall.data File Pa
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Figure 48. Logon to OS/390 Menu Opt
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6.5 Setting Up ET/390 Properties Ta
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Figure 52. Bind Options Select the
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This is equivalent to the Language
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Figure 55. Run Main Properties To e
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Figure 57. Export a Class File for
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Figure 58. Export a Class File for
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7.1 Design of a Site modifying the
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Figure 63. Left Part of the Toolbar
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Figure 67. Page View of NetObjects
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Connectivity (JDBC) and Microsoft's
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Figure 71. Specify the TCP/IP Param
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Figure 73. Specify the Local Name o
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However, this problem can be solved
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The CLI INI file is used by JDBC to
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LOWOFFLOAD() HIGHOFFLOAD(8) RETPD(1
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invokes the first JDBC driver that
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jdbc also allows for user/password
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static String DbLocationName = "SC5
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Servlets just hate nulls if referen
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manufacturer = "" ; // Clear fields
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} if (button.equals("SEARCH")) { ou
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statement. You can use SQL comments
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ctx myconn=new ctx(jdbccon); SQLJ u
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When SQLJ encounters an iterator de
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when a next row is available, and a
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connection context, followed by the
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// // ### 2 ### // // In order
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// // ### 1 ### // // In order
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public void doManUpdateScreen(HttpS
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else if (button.equals("SEARCH")) {
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} out.println(" "); out.
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9.2.14 Translating SQLJ Source Code
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Reference. The default is the value
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SAMPLE3.SAMPLE3) - ISOLATION(CS) AC
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2. CJGW itself can also run as an a
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Browser HTTP/HTML Web Server CICS C
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Browser 1. HTML only Browser 2. HTM
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The CICS Gateway for Java incorpora
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Figure 89. CICS Java Gateway Class
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The servlet pulls the data supplied
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10.5.2.6 CICS Server The CICS Serve
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Figure 91. CICS Gateway for Java fo
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-port= - TCP/IP port number for the
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10.5.4.2 Set Up the CICS Client Aft
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java ibm.cics.jgate.test.TestECI jg
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10.5.8 VisualAge for Java Setup to
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The summary of tasks needed to set
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10.6.2.7 Setting Environment Variab
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10.6.3 Running the CICS Gateway for
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Assuming that you have installed th
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BIND THE PROGRAM // //BIND EXEC PGM
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Note that MANU was our driver trans
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10.6.8 Deploy Servlets The servlets
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Figure 100. Manufacturer Ap
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Before you test, make sure your CLA
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Notes: ▌1▐These lines have been
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10.7.2 Looking at the Code for the
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public void service(HttpServletRequ
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Figure 108. Extract of the buildCom
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8. The .jsp servlet accesses the at
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enables you to edit input and outpu
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The logical outbound message is com
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var mod = new Array(); ▌1▐ var
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HTTP HTML HTTP VarVal URL + Data fr
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a Webserver identification. A Webse
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itso/ibm/ims/BuildParse interface i
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▌1▐The Appc2Ims object is recup
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if (inOut != null) comflag = inOut.
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outines located in hJNIRtns.c. For
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if ( _FBCHECK (fc, CEE ) != ) ??<
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4 Refer to the enclosed disk for th
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} } tmstate.setAppc2ims(null); // T
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%IMS_OUT %# -----------------------
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Client programs can connect to the
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GET( ENABLED ) + SHARE These explan
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eferences. This hashtable, besides
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fromims.characterSet=mqcharset; //
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import java.io.; import com.ibm.rec
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1. The Web browser or servlet code
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Figure 121. Reference HTML Page Win
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Search Search Manufacture
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15.2 Writing JSP Code and Servlets
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function launch(list) { var urlstri
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16.2.1 JSP if (isManAddRequest()) {
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NT OS/390 Bytecode Compiler ET/390
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18.2 Scenario II Both classes are b
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Note: Do not delete the file named
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} } t1 = System.currentTimeMillis()
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20.2.4 Program Monitor Window You c
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23.2 Other JNI Tips JNIEXPORT void
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Note: For IMS and MQSeries we have
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-rwxr-xr-x 1 ALEX TSO 648 Apr 26 15
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Menu List Mode Functions Utilities
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A.3.4.3 Configuring DB2 It is beyon
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A.3.4.5 Configuring the VSAM Sample
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For further information on the mode
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Figure 133 on page 314 shows the at
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To keep it generic, we use factorie
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edbook.data.jdbc Business objects,
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{ String password) throws SQLExcept
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eturn the Vector return getDataElem
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append( " (man_name, man_address, m
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Any pointers in this publication to
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D.4 External Publications DB2 for
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IBM Redbook Fax Order Form Please s
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adding a dataset to the search path
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db2jstsrt 108 IDB2.configuring the
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Lotus Domino Go Webserver for OS/39
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SQLJ (continued) jvm.properties cha
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