Not finding any pointers, asking here: is it possible to define environment 
variables for a webapp?
If so, how?

---rony

P.S.: Tomcat can manipulate the process' environment, e.g. in the case of CGI 
execution. Here a
sample of the process' environment from some CGI-invocation on a Windows 
machine:

    (debug) current cgi process environment:||

     1. |AUTH_TYPE=
     2. COMSPEC=C:\WINDOWS\SysWOW64\CMD.EXE
     3. CONTENT_LENGTH=7
     4. CONTENT_TYPE=application/x-www-form-urlencoded
     5. GATEWAY_INTERFACE=CGI/1.1
     6. 
HTTP_ACCEPT=text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
     7. HTTP_ACCEPT_ENCODING=gzip, deflate
     8. HTTP_ACCEPT_LANGUAGE=en-US,en;q=0.5
     9. HTTP_COOKIE=JSESSIONID=2137ECEC8CC5EE35AEFA475E5C5D8250
    10. HTTP_HOST=localhost:8080
    11. 
HTTP_REFERER=http://localhost:8080/demoSTL-Core-SQL_ooRexx/JSTL_CGI_05-GroupWorkDivider.jsp
    12. HTTP_USER_AGENT=Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:87.0) 
Gecko/20100101 Firefox/87.0
    13. PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.JS;.WS;.MSC
    14. PATH_INFO=
    15. PROMPT=$P$G
    16. 
QUERY_STRING=name=Andreas+Burgstaller&name=Max+Mustermann&name=Nadine+Berger&name=Klaus+Karter&name=Simon+Hauser&name=Michael+Nimmervoll
    17. REMOTE_ADDR=127.0.0.1
    18. REMOTE_HOST=127.0.0.1
    19. REMOTE_IDENT=
    20. REMOTE_USER=
    21. REQUEST_METHOD=POST
    22. REQUEST_URI=/demoSTL-Core-SQL_ooRexx/cgi-bin/groupStudents.rexx
    23. RXQUEUESESSION=00003B1C
    24. SCRIPT_FILENAME=D:\Apache Software Foundation\Tomcat
        9.0\webapps\demoSTL-Core-SQL_ooRexx\WEB-INF\cgi\groupStudents.rexx
    25. SCRIPT_NAME=/demoSTL-Core-SQL_ooRexx/cgi-bin/groupStudents.rexx
    26. SERVER_NAME=localhost
    27. SERVER_PORT=8080
    28. SERVER_PROTOCOL=HTTP/1.1
    29. SERVER_SOFTWARE=TOMCAT
    30. SystemRoot=C:\WINDOWS
    31. X_TOMCAT_SCRIPT_PATH=D:\Apache Software Foundation\Tomcat
        9.0\webapps\demoSTL-Core-SQL_ooRexx\WEB-INF\cgi\groupStudents.rexx
        | 


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