[LOG4J2-3632] Using log4j-1_2-api to load XML configuration - Logger.getAppenders() empty

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 2.19.0
• Component/s: Log4j 1.2 bridge
• Assignee: Piotr Karwasz
• Reporter: Jeff Thomas
• Created: 13/Nov/22 01:06
• Updated: 14/Nov/22 16:11

Description

I have used the log4j 1.2 bridge XmlConfigurator to load a 1.2 XML configuration and performed a `Configurator.reconfigure(configuration)`.

Then I retrieved a logger using "Logger.getLogger(String)".

When I then call 'Logger.getAppenders()" the returned enumeration is empty.

Looking at the logger in the debugger I can see the attached Appenders in the associated LoggerConfig.

In `org.apache.log4j.Category` I stepped through and got to here which returned an empty collection.

I might be doing something wrong ... it has been known to happen.   But I was expecting to get the two configured appenders "console" and "file" here.

The "problem" seems to be here with the stream filter:

return Collections.enumeration(appenders.stream()
                    // omit native Log4j 2.x appenders
                    .filter(AppenderAdapter.Adapter.class::isInstance)
                    .map(AppenderWrapper::adapt)
                    .collect(Collectors.toSet()));

The Javadoc in `Category` does say:

 Get all the Log4j 1.x appenders contained in this category as an {@link Enumeration}. Log4j 2.x appenders are omitted.

But I did load the configuration with the Bridge and I was hoping my legacy code would still get the Appenders as before.