The VMargument values not properly read by log4j2.properties - spring

Question

Spring web application with log4j2 implemented in tomcat 8 running in windows and linux servers.
In windows server
CATALINA_OPTS specified in setenv.bat file
set "CATALINA_OPTS=-DLOG_FOLDER=D:\apache-tomcat-9.0.22\customlog"
log4j2.properties file is inside WEB-INF\classes\config\
appender.rolling.fileName=${sys:LOG_FOLDER}\logger.log
appender.rolling.filePattern=${sys:LOG_FOLDER}\logging-%d{MM-dd-yyyy}-%i.log.gz
In linux server
CATALINA_OPTS specified in setenv.sh file
set "CATALINA_OPTS=-DLOG_FOLDER=/opt/tomcat01/customlog"
log4j2.properties file is inside WEB-INF\classes\config\
appender.rolling.fileName=${env:LOG_FOLDER}/logger.log
appender.rolling.filePattern=${env:LOG_FOLDER}/logging-%d{MM-dd-yyyy}-%i.log.gz
log folder is always created like '${env:LOG_FOLDER}' or '${sys:LOG_FOLDER}'

Answer 1

You should use ${sys:LOG_FOLDER} in both cases:
${sys:property_name} retrieves the Java system property of that name,
${env:variable_name} retrieves the OS environment variable of that name.
See Log4j 2 Lookups for more details.
There are also other problems in your configuration:
if you start Tomcat on Windows as a service, setenv.bat is not used. You should add -DLOG_FOLDER=D:\apache-tomcat-9.0.22\customlog to the Java tab of the Tomcat Monitor application (bin\tomcat<version>w.exe).
on Linux you are using the wrong syntax to modify an environment variable (Microsoft's syntax), use:
export CATALINA_OPTS="-DLOG_FOLDER=/opt/tomcat01/customlog"
instead.
Remark: If you want to use environment variables instead of system properties, you can use:
export LOG_FOLDER="/opt/tomcat01/customlog"
on Linux, while on Windows you need to run:
tomcat10.exe //US ++Environment="LOG_FOLDER=D:\apache-tomcat-9.0.22\customlog"
See Procrun documentation for more details.