I need to handle log4j:WARN Unrecognized element param

[Turner, Jay]

I get "log4j:WARN Unrecognized element param" because we have some extra 
entries in the log4j 1.2.15 XML configuration file at the root level.

The code uses
DOMConfigurator configurator = new DOMConfigurator();
configurator.doConfigure(inputStream, 
org.apache.log4j.LogManager.getLoggerRepository());

The LoggerRepository returned doesn't implement UnrecognizedElementHandler (or 
at least not that I know how to connect to it).
I thought of using
class ExtendedLoggerRepository extends org.apache.log4j.LoggerRepositoryExImpl {
                public boolean parseUnrecognizedElement(
                        org.w3c.dom.Element element,
                        java.util.Properties props)
                        throws java.lang.Exception {
                        // My code
                }
        }
        configurator.doConfigure(
                inputStream,
                new 
ExtendedLoggerRepository(org.apache.log4j.LogManager.getLoggerRepository()));

But my IntelliJ says that LoggerRepositoryExImpl, which is a public final 
class, is not in that package nor the spi subpackage.

What is the right way of using the default logger repository but hooking in so 
that I can parse extra parameters as in:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"; 
debug="true">
<param name="somename" value="somevalue"/>
:

Thank you,
Jay Turner