Log4j2 stops logging to log file after clearing log file - log4j2

Question

I am running my application on a WebLogic within a Linux environment. after clearing the content of the log file using ">log4j2.log". my application stops logging at all.
I have tried restarting my application, and then the server but still no logs.
also tried deleting the file using rm -f and then doing the restart but still no logs. see the config below.
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="warn" monitorInterval="60">
<Appenders>
<RollingFile name="RollingFileAppender"
fileName="./PortalLogs/log4j2.log"
filePattern="./PortalLogs/log4j2.log.%i.%d{yyyy-MM-dd}"
immediateFlush="true">
<PatternLayout>
<Pattern>%d %-5p [%X{messageExtTxt}] [%c] %m%n</Pattern>
</PatternLayout>
<Policies>
<TimeBasedTriggeringPolicy interval="1" />
<SizeBasedTriggeringPolicy size="10MB"/>
</Policies>
<RegexFilter regex="*DefaultMessageListenerContainer*" onMatch="DENY" onMismatch="ACCEPT"/>
<DefaultRolloverStrategy max="30"/>
</RollingFile>
</Appenders>
<Loggers>
<Logger name="org.springframework.jms.listener.DefaultMessageListenerContainer" level="ERROR" >
<AppenderRef ref="RollingFileAppender"/>
</Logger>
<Root level="INFO">
<AppenderRef ref="RollingFileAppender" level="INFO"/>
</Root>
</Loggers>
</Configuration>
When I tried using delete from WinSCP instead and then restarted the server, the log files were again produced and with logs in it.
My question is that is there a way to clean the log files safely without causing this issue? thanks in advance!
EDIT: Linux's RM on the log file before restarting the server actually works and recreates the log file, but still is there a way to make it work using ">log4j2.log" or after modifying the file? we need this as we have a protocol to do an initial run for automated tests, clear everything and then do an actual run.