Error in Using Multiple Categories

[an...@NextSet.com]

Sir,

   We are trying Multiple Categories with Single Appender.
   we change the levels for each category in the Properties file at runtime,
   and try to reconfigure it new. But its not appending to the files (here we use rollingFileAppender)
   and it gives the error as
   log4j:ERROR Attempted to append to closed appender named [A1].
   log4j:WARN Not allowed to write to a closed appender.
   log4j:ERROR Attempted to append to closed appender named [A1].
   log4j:WARN Not allowed to write to a closed appender.
   
   It appends improperly missing data's. This we tried using multi clients
   using multithreading.
   
   The Config File is.
   # Audit Log properties for log4j logging system
   
   log4j.appender.A1=org.apache.log4j.RollingFileAppender
   log4j.appender.A1.MaxFileSize=100kb 
   log4j.appender.A1.MaxBackupIndex=100 
   log4j.appender.A1.layout=org.apache.log4j.PatternLayout
   log4j.appender.A1.layout.ConversionPattern=%m%n
   log4j.appender.A1.File=logging\\logger.log
   log4j.appender.A1.Append=true
   
   log4j.category.Cash=WARN,A1
   log4j.category.Repo=DEBUG,A1
   log4j.category.FixedIncome=DEBUG,A1
   log4j.category.Security=DEBUG,A1
   log4j.category.Log=DEBUG,A1
   
   We need ur help to clear this error and we need to know where we have to
   configure if we change the levels at runtime. We want to reflect at runtime itself.
   Even we tried to shutdown all the categories and had a fresh instance of each category objects
   and then again we configured.Still its giving error.
   
   Regards,
   Anand