[jira] [Created] (LOG4J2-2984) Filters are not applied to loggers

["Samuel Martin (Jira)" <ji...@apache.org>]

Samuel Martin created LOG4J2-2984:
-------------------------------------

             Summary: Filters are not applied to loggers
                 Key: LOG4J2-2984
                 URL: https://issues.apache.org/jira/browse/LOG4J2-2984
             Project: Log4j 2
          Issue Type: Bug
          Components: Configuration, Documentation, Filters
    Affects Versions: 2.14.0
            Reporter: Samuel Martin


According to the documentation, Filters can be applied in different places: among others, as global filters applied to the whole configuration, to individual Appenders or... to individual loggers. However, when trying to configure a filter within a Logger, it doesn't seem to be applied.

After debugging the issue, I think I have traced it to these lines within {{org.apache.logging.log4j.core.Logger$PrivateConfig}} internal class:

{code:java}
        boolean filter(final Level level, final Marker marker, final String msg) {
            final Filter filter = config.getFilter();
            if (filter != null) {
                final Filter.Result r = filter.filter(logger, level, marker, msg);
                if (r != Filter.Result.NEUTRAL) {
                    return r == Filter.Result.ACCEPT;
                }
            }
            return level != null && intLevel >= level.intLevel();
        }
{code}

The first line is retrieving the filter from the global configuration {{config.getFilter()}} instead of the filter (if any) from this logger {{loggerConfig.getFilter()}}. The global configuration filter is applied, while the latter is simply ignored.

Some additional notes follow:
* The same reasoning applies at least to the other filter(...) methods in the PrivateConfig class.
* According to the documentation, the {{LoggerConfiguration}}'s level is applied before the filters; but the code doesn't say exactly the same (if the filter result is {{ACCEPT}}, then the event is not filtered, regardless the {{LoggerConfiguration}}'s level.
* This is in practice a duplicate of LOG4J2-1965. I don't know why it was closed by the author just after having opened it, nor how it has not been fixed since then.



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