Abstract
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    This document describes the manual process necessary to update the Java Runtime Environments (JRE) to 11.0.21.0 support for CICS Transaction Gateway for Multiplatforms 9.3 or remote mode applications that use the CICS® Transaction Gateway Java or JEE APIs.

Content
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    Updating the JRE for CICS Transaction Gateway or remote mode application that is supplied by the CICS Transaction Gateway for Multiplatforms 9.3 image, outside of the Fix Pack installation mechanism, is a manual process.
    The installation procedure command line syntax is different for each platform. The installation steps need to be performed by a user ID on the system that has sufficient authority to modify the JRE installation, for example the root user.

Installation
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1. Download the updated JRE package from the IBM Support website https://developer.ibm.com/languages/java/semeru-runtimes/downloads/.

Linuxx86_6464
https://github.com/ibmruntimes/semeru11-binaries/releases/download/jdk-11.0.21%2B9_openj9-0.41.0/ibm-semeru-open-jre_x64_linux_11.0.21_9_openj9-0.41.0.tar.gz

LinuxzSeries64
https://github.com/ibmruntimes/semeru11-binaries/releases/download/jdk-11.0.21%2B9_openj9-0.41.0/ibm-semeru-open-jre_s390x_linux_11.0.21_9_openj9-0.41.0.tar.gz

LinuxpSeries64le
https://github.com/ibmruntimes/semeru11-binaries/releases/download/jdk-11.0.21%2B9_openj9-0.41.0/ibm-semeru-open-jre_ppc64le_linux_11.0.21_9_openj9-0.41.0.tar.gz

AIXpSeries64
https://github.com/ibmruntimes/semeru11-binaries/releases/download/jdk-11.0.21%2B9_openj9-0.41.0/ibm-semeru-open-jre_ppc64_aix_11.0.21_9_openj9-0.41.0.tar.gz

2. Make a note of the version of the JRE that your installation is currently using. This is also used to verify that this JRE update has been successful.

   <JRE_INSTALL_DIR>/bin/java -fullversion
   <CTG Install Location>/jvm11/bin/java -fullversion

3. Expand the compressed download file into a temporary local directory.

4. Stop the CICS Transaction Gateway/ remote mode applications (if the jre is being used for remote mode applications is required to be updated) associated with the installation that is to be updated.

5. Backup the existing JRE installation by renaming the existing jre.

6. Copy the JRE compressed files to the <CTG Install Location>/ or <JRE_INSTALL_DIR>/

7. Extract all these JRE files into this directory.

8. Update the file permissions to match the original JRE installation.

9. Optional: Verify that the update has been successful by re-running the 'java -fullversion' command, in a similar way to that used in step 2

Uninstallation
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1. Stop all the remote mode applications associated with the installation that is to be updated.

2. Delete the JRE directory and move the backed up JRE directory back into its original location

NOTE:
Windows and Power BE supports Java 8 only.