Switching between JVMs in WebSphere Application Server 6.1 for i5/OS

Enabling 32 bit or Classic JVMs for a WebSphere profile in i5/OS

Attention: You can install WebSphere Application Server 6.1 multiple times on the same server or logical partition. To get a list of all of your installed environments, including the default profile location and install library, you can use the following script:

/QIBM/WAS/bin/queryWASinstalls

By default, WebSphere Application Server version 6.1 uses Classic JVM for all newly created profiles. If you want to use IBM Technology for Java VM (32-bit JVM), you need to use a special Qshell script.

WebSphere Application Server version 6.1 for i5/OS includes the following i5/OS Qshell script that can switch the JVM type (if you do not use the default installation directory, you need to adjust these instructions accordingly):

/QIBM/ProdData/WebSphere/AppServer/V61/Base/bin/enableJvm

enableJVM <parameters>

• -jvm [std32 | classic]

  This is a required parameter that specifies the JVM in use:

  
  std32 = IBM Technology for JVM
  classic = Classic JVM
• -profile <profile_to_be_enabled>

  This is an optional parameter that specifies the profile for which you enable a desired JVM.

  Important: If a profile is not specified, all profiles are switched to the specified JVM.

• -verbose

  This is an optional parameter that enables additional trace statements.

Here are several examples:

• enableJVM -jvm std32 -profile default

  This sets the default profile to run on IBM Technology for JVM.

• enableJVM -jvm classic

  This sets all profiles to run on Classic JVM.

• enableJVM -jvm std32 -profile default -verbose

  This sets the default profile to run on IBM Technology for JVM and display additional details on the screen.

  Attention: With WebSphere Application Server Network Deployment V6.1, it is possible to include servers with Classic JVM and IBM Technology for JVM in the same cell.

These instructions provide a complete set of steps for switching to IBM Technology for JVM:

• Sign in to the System i platform with an appropriate user ID and password.
• Enter STRQSH on the CL command line and press Enter.
• At the Qshell prompt, run the following command (we use the default installation location):

  cd /QIBM/ProdData/WebSphere/AppServer/V61/Base/bin

• If your profile is running, stop it (we use the default profile):

  stopServer -profileName default

  Sample output is shown in the following example:

  ________________________________________________________________________ QSH Command Entry $ > cd /QIBM/ProdData/WebSphere/AppServer/V61/Base/bin $ > stopServer -profileName default ADMU0116I: Tool information is being logged in file /QIBM/UserData/WebSphere/AppServer/V61/Base/profiles/default/logs/server1/stopServer.log ADMU0128I: Starting tool with the default profile ADMU3100I: Reading configuration for server: server1 ADMU3201I: Server stop request issued. Waiting for stop status. ADMU4000I: Server server1 stop completed. ===> F3=Exit F6=Print F9=Retrieve F12=Disconnect F13=Clear F17=Top F18=Bottom F21=CL command entry ________________________________________________________________________

• Invoke the enableJVM script to change your profile to use the IBM Technology for JVM:

  enableJVM -profile default -jvm std32

  This is the example of the command's output:

  ________________________________________________________________________ QSH Command Entry > enableJVM -profile default -jvm std32 ADEJ0014I: Enabling profile default to use the specified JVM. ADEJ0002I: Success: The profile will now use the specified JVM. $ ===> F3=Exit F6=Print F9=Retrieve F12=Disconnect F13=Clear F17=Top F18=Bottom F21=CL command entry ________________________________________________________________________

• Start the WebSphere Application Server profile that you changed earlier.

  startServer -profileName default

  This is the sample output from the startServer command:

  ________________________________________________________________________ QSH Command Entry > startServer -profileName default CPC1221: Job 089988/QEJBSVR/SERVER1 submitted to job queue QWASJOBQ in library QWAS61. CWNATV00I: Application server server1 in profile default has started and is ready to accept connections on admin port 9060. ===> F3=Exit F6=Print F9=Retrieve F12=Disconnect F13=Clear F17=Top F18=Bottom F21=CL command entry ________________________________________________________________________

• Your server must now run in IBM Technology for JVM.