Upgrading Java versions and patches will involve path changes in various configuration files for AR Server to function without errors on directories for AR Server and registry changes if it's a Windows Server.

The following are few common areas that involve path changes in AR Server.

a. If the Java installed is JDK1.X.0_12  and upgraded to JDK1.X.0_32 then the folder structure for Java changes as the directory for JDK changes from 1.X.0_12 to 1.X.0_32.  The same applies for JRE installation/upgrades.

b. If JDK and JRE are installed separately then you may need to change or correct the path according the JRE and JDK locations.

c.  Check the Compatibility Matrix of the respective AR Server version as to whether the new Java ersion is compatible or not. 

Note - In version 19.02 OpenJDK is supported. To update the current Java version to OpenJDK, in 19.02 please check the following:
19.02/OpenJDK - Updating Java paths after upgrading Java

For ARS 9.x on Windows see the following knowledge article.
The article also applies to ARS 9.x on Linux/Server omitting the references to the Windows Registry key.
Remedy - Server - ARS 9.x Remedy Services doesn't start after Java Upgrade (Windows)

For pre-9.x versions of ARS, the following applies. The X or XXX is a placeholder for whatever version of java or version of the binary is found in the config file.

WINDOWS PLATFORM

1. correct the java paths in C:\Program Files\BMC Software\ARSystem\Conf\armonitor.cfg, for example:

"C:\Program Files\Java\jreX\bin\java" -Xmx512m -classpath "D:\Program Files\BMC Software\ARSystem\pluginsvr;D:\Program Files\BMC Software\ARSystem\pluginsvr\arpluginsvrXXX_build002.jar" com.bmc.arsys.pluginsvr.ARPluginServerMain -x servername -i "D:\Program Files\BMC Software\ARSystem" -m

2. For the email engine make changes in the configuration file as well as in the registry.
Verify the C:\Program Files\BMC Software\ARSystem\AREmail\EmailStart.bat file for the java path specified on windows:

set JavaPath=C:\Program Files\Java\jreX\bin

In the registry need to look at the following registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\BMC Remedy Email Engine - <servername>.

Expand this key by clicking on the + sign and selecting Parameters, in this section please verify the java path and file names specified whether they exist or not, for instance, need to verify if the JVM library i.e. jvm.dll is referred which must exist.

3. For Flashboards make the following changes:

Registry changes for Flashboards need to be performed at this location:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\BMC Remedy Flashboards Server- <servername>.

Expand this key by clicking on the + sign and in the parameters section needs to verify whether the path is correct and the correct file is referred.

4. From a Mid-Tier perspective perform the following (Ref: KA354708 / 000025634):

a. Go to X:\..\Apache Software Foundation\Tomcat <version>\bin
b. Run tomcatXw.exe, this should open the "Apache Tomcat Properties"
c. Go to the JAVA tab and set the path for "Java Virtual Machine" appropriately.

5. For client applications such as Developer Studio the following changes are required.

a. For Developer Studio, the following file must be updated with the correct java path.
C:\Program Files\BMC Software\RemedyARS\DeveloperStudio\devstudio.ini

b. For the User Tool and Remedy Alert tool, no changes are required.

c. For the Data Import Tool we need to modify the following file with the correct java path.
C:\Program Files\BMC Software\ARSystem\dataimporttool\dataimporttool.ini


LINUX, SOLARIS, AND OTHER PLATFORMS

1. Correct the java paths in /etc/arsystem/MACHINENAME/armonitor.conf, for example:

/data1/Java/jre1.X.0_30/bin/java -Xmx512m -classpath /opt/bmc/ARSystem/pluginsvr:/opt/bmc/ARSystem/pluginsvr/arpluginsvrXXX_build002.jar com.bmc.arsys.pluginsvr.ARPluginServerMain -x servername -i /opt/bmc/ARSystem/

2. For the email engine make changes in the configuration file in /opt/bmc/ARSystem/AREmail/emaild.sh script in case of email engine
For instance in emaild.sh following need to be verified and corrected.

JAVA_DIR=/data1/Java/jre1.X.0_30
JAVA_BIN=/data1/Java/jre1.X.0_30/bin/sparcv9

3. Correct the path on Flashboards config in case of flashboard
In /opt/bmc/ARSystem/flashboards/server.sh file need to check the path specified as given below:

JAVA_DIR=/data1/Java/jre1.X.0_30
JAVA_BIN=/data1/Java/jre1.X.0_30/bin/sparcv92.c

4. Correct OS-level environment variables JAVA_HOME and JAVA_BIN
Use the following commands for checking the existing values for the above variables:
echo $JAVA_HOME
echo $JAVA_BIN
and in order to set the path use the  following commands:
export JAVA_HOME=<new java path>
export JAVA_BIN=<new bin path>
 

5. Correct the path in ARsystem Script which is used for the start and stop of a Remedy service.
arsystem.sh script
Please ensure you change:
JAVADIR=
JAVA_HOME=

6. Similarly modify the Java path for the below files:
a.  arserverd.conf at the location /opt/bmc/ARSystem/bin
b.  pluginsvr_conf.xml  at location /opt/bmc/ARSystem/pluginsvr
c.  normeng.sh at location /opt/bmc/AtriumCore/cmdb/server/bin
d.  atriumplugin.sh  at the location /opt/bmc/AtriumCore/cmdb/server/bin


7. For Mid-Tier on Linux and Solaris environments please perform the following:
Kindly update the path in the following files located in <tomcat>\bin folder
startup.sh
catalina.sh

Tomcat gathers java changes through OS environment variables as well. So kindly update the JAVA_HOME variable as mentioned above.