Smart Service plugin not logging

Hi,

I wants to perform logging on my custom plugin but it isn't logged at all. Not sure if I had missed out any steps. You may refer to the log properties as follows

<APPIAN_HOME/deployment/web.war/WEB-INF/resources/appian_log4j.properties

log4j.logger.tech.custom.smartservices=INFO, CONSOLE, CUSTOM_PLUGIN_LOGGER
###### Custom Plugin  appender
log4j.appender.CUSTOM_PLUGIN_LOGGER=org.apache.log4j.RollingFileAppender
log4j.appender.CUSTOM_PLUGIN_LOGGER.layout=org.apache.log4j.PatternLayout
log4j.appender.CUSTOM_PLUGIN_LOGGER.layout.ConversionPattern=%d, %t, %-5p, %m%n
log4j.appender.CUSTOM_PLUGIN_LOGGER.File=${AE_LOGS}/custom_plugin.log
log4j.appender.CUSTOM_PLUGIN_LOGGER.MaxFileSize=10MB
log4j.appender.CUSTOM_PLUGIN_LOGGER.MaxBackupIndex=10
log4j.appender.CUSTOM_PLUGIN_LOGGER.encoding=UTF-8

Fyi, I'm using Appian 19.2 and I have restarted my tomcat after configuring the log4j properties.