I developed my application on weblogic 7 and use log4j for logging. However, when the log file size reaches 10kb (i specified this value in the log4j.ctl), log4j can't rename it to abc.log_1. It writes the coming messages into the same log file. It seems that weblogic occupying the log file and thus causing log4j can't rename it and can't open a new one for further logging. How can i overcome this problem? thanks.