Tomcat fails to install due to Tomcat already exists or installed on this machine message

Products

• CA Automic Applications Manager (AM)

Issue/Introduction

When installing or upgrading Applications Manager, Tomcat may fail to install. The return message is "Tomcat already exists/installed on this machine."

This message is seen even though Tomcat may not be installed. Example message from installation below:

Enter Source Path and OJDBC jar file (example: /home/jar/ojdbc6.jar) : 
/usr/users/appworx/ojdbc8. jar 
Copy ojdbc from /usr/users/appworx/ojdbc8.jar to /usr/users/appworx/ojdbc/ojdbc. 
Copy ojdbc jar file done. 

Applications Manager requires a web server to upload the Applications Manager 
Java Client to user's machines. 
The Tomcat Web Server is included with Applications Manager. 

Would you like to install Tomcat now? [N]
Y 
Silent installation? [Y] 
Tomcat already exists/installed on this machine. 

Environment

Release : 9.4.x

Cause

Defect.

Installation script is coded to check if SERVER_ROOT environment variable exists. This may exist if Apache Webserver was previous installed.

Resolution

Fixed in 9.5.0.

This issue can occur if the following environment variable exist:

SERVER_ROOT

Check to see if this environment variable exist by running:

echo $SERVER_ROOT

If a value is returned, unset the environment variable by running:

unset SERVER_ROOT

Once SERVER_ROOT has been unset, run the installation and attempt to install Tomcat once more.