Debug logs are not getting printed in custom module

Wowza Developer Dojo
1

Hi,
I have created a custom module to meet a specific use-case. in my module DEBUG logs are not getting printed in the log file, however I am able to print INFO, WARN, ERROR level logs.

for example : consider the onAppStart event in the custom module, here the info level log is printed in the log file but debug level is not getting printed.

public void onAppStart(IApplicationInstance appInstance)
{
    getLogger().info("Info level log"); // getting printed
    getLogger().debug("Debug level log"); // not getting printed

}

I have made the changes in log4j.properties file and changed the initial line as
log4j.rootCategory=INFO, stdout, serverAccess, serverError to log4j.rootCategory=DEBUG, stdout, serverAccess, serverError

is this the default behavior of the logger or is this a BUG in streaming engine or I have to make some more configuration for putting wowza in debug mode ?