Log4j question about closed appender error

Hi all,
In my company's project, we have used the log4j 1.1.3 for logging. Since in the project, there are a few applications. We have a common properties to state the log4j properties for AppSTDERR(console), AppLogFile and AppNTEventLog. And we also have a properties file for each application. In each proeprties file, we state a different path to the AppLogFile for different application. We use PropertyConfigurator.configure() to configure the properties and use Category.getRoot(). However, sometimes some application's log will log to another application log file. So we decide to change the application properties file like this:
log4j.category.AppXXX=DEBUG, AppXXXSTDERR, AppXXXLogFile
log4j.appender.AppXXXLogFile=org.apache.log4j.DailyRollingFileAppender
log4j.appender.AppXXXLogFile.File=C:\\xxx\\xxx.log
log4j.appender.AppXXXLogFile.layout=org.apache.log4j.PatternLayout
log4j.appender.AppXXXLogFile.layout.ConversionPattern=%d{ISO8601} [%-5p] [%t] %m%n
log4j.appender.AppXXXSTDERR: org.apache.log4j.ConsoleAppender
log4j.appender.AppXXXSTDERR.layout: org.apache.log4j.PatternLayout
log4j.appender.AppXXXSTDERR.layout.ConversionPattern: %d{ISO8601} [%-5p] [%t] - %m%n
We don't use Category.getRoot() and use Category.getInstance("AppXXX") instead. But we sometimes get these errors on console:
log4j:ERROR Attempted to append to closed appender named [AppSTDERR].
log4j:WARN Not allowed to write to a closed appender.
log4j:ERROR Attempted to append to closed appender named [AppLogFile].
log4j:WARN Not allowed to write to a closed appender.
We don't know what is the problem. We guess that some common programs will log common messages to AppLogFile and AppSTDERR but we do not open the AppLogFile and AppSTDERR in each application. Is that we have to use Category.getRoot() ?
Anybody help?
Raymond

Do you not need a DatePattern value for the DailyRollingFileAppender? DatePattern being the variable that determines WHEN the logs are rolled.
If not specified what is the default value? Could not setting this value result in strange behavior?
These are shots in the dark I know but we are having similar issues. I can't find any documentation on what the default value is of DatePattern if not specified and have no idea what happens if no value is set. At any rate we are going to supply a value for DatePattern and see if it fixes our problem, I'll post the resutls.

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