Wednesday, October 27, 2010

Disabling Apache POI Logging

Jakarta POI LogoImage via Wikipedia
In order to effectively disable the logging functionality in Apache POI you must use an alternative logger. This is accomplished by providing a property to the POILogFactory to override the default logger. Examining the partial code from the POILogFactory, we see that we can pass a logger name into it.

public static POILogger getLogger(final String cat)
        POILogger logger = null;
        // If we haven't found out what logger to use yet,
        //  then do so now
        // Don't look it up until we're first asked, so
        //  that our users can set the system property
        //  between class loading and first use
        if(_loggerClassName == null) {
         try {
          _loggerClassName = System.getProperty("org.apache.poi.util.POILogger");//<<---------- Logger Name
         } catch(Exception e) {}
         // Use the default logger if none specified,
         //  or none could be fetched
         if(_loggerClassName == null) {
          _loggerClassName = _nullLogger.getClass().getName();
So we need to simply set the Logger property which can be accomplished from the command line. We will use the Apache Commons Logging Library to accomplish it.
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