No recent information in log file.

i observe that , have initialised logs as

if(!isInitalized){
APP_LOGS = Logger.getLogger("devpinoyLogger");//devpinoyLogger

in TestBase class


But i get warning:
[b:33pehsqc]log4j:WARN No appenders could be found for logger (org.apache.http.client.protocol.RequestAddCookies).
log4j:WARN Please initialize the log4j system properly.[/b:33pehsqc]

[b:33pehsqc]Issue i face:[/b:33pehsqc]:Recent logs are not present in my log file & older logging details are present