rm5248 commented on issue #391:
URL: 
https://github.com/apache/logging-log4cxx/issues/391#issuecomment-2226393670

   Probably the issue is that your naming is incorrect.
   
   The macro `DECLARE_LOG4CXX_OBJECT(NullWriterAppender)` maps to the name of 
the class, and it is this name(`NullWriterAppender`) that is used to load the 
class.  
   
   The code and config file go together, so they need to look something like 
this:
   ```
   class MyAppender : public AppenderSkeleton {
   public:
        DECLARE_LOG4CXX_OBJECT(MyAppender)
   ...
   };
   
   In the XML file:
     <appender name="some-name-here" class="MyAppender">
     </appender>
   ```
   
   Note that the appender does not need to be in the `log4cxx` namespace at all.


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