Improvements on the logger message factory namespacing (#2961)

Author: vy

log4j-api/src/main/java/org/apache/logging/log4j/simple/SimpleLoggerContext.java

@@ -95,7 +95,7 @@ public Object getExternalContext() {
 
     @Override
     public ExtendedLogger getLogger(final String name) {
-        return getLogger(name, null);
+        return getLogger(name, DEFAULT_MESSAGE_FACTORY);
     }
 
     @Override

log4j-api/src/main/java/org/apache/logging/log4j/spi/LoggerRegistry.java

@@ -240,7 +240,8 @@ public boolean hasLogger(final String name, final Class<? extends MessageFactory
     }
 
     /**
-     * Registers the provided logger using the given name – <b>message factory parameter is ignored</b> and the one from the logger will be used instead.
+     * Registers the provided logger.
+     * <b>Logger name and message factory parameters are ignored</b>, those will be obtained from the logger instead.
      *
      * @param name ignored – kept for backward compatibility
      * @param messageFactory ignored – kept for backward compatibility

log4j-taglib/src/main/java/org/apache/logging/log4j/taglib/Log4jTaglibLoggerContext.java

@@ -63,7 +63,7 @@ public Object getExternalContext() {
 
     @Override
     public Log4jTaglibLogger getLogger(final String name) {
-        return getLogger(name, null);
+        return getLogger(name, DEFAULT_MESSAGE_FACTORY);
     }
 
     @Override
@@ -87,7 +87,7 @@ private Log4jTaglibLogger createLogger(final String name, final MessageFactory m
 
     @Override
     public boolean hasLogger(final String name) {
-        return loggerRegistry.hasLogger(name);
+        return loggerRegistry.hasLogger(name, DEFAULT_MESSAGE_FACTORY);
     }
 
     @Override

log4j-to-jul/src/main/java/org/apache/logging/log4j/tojul/JULLoggerContext.java

@@ -44,7 +44,7 @@ public Object getExternalContext() {
 
     @Override
     public ExtendedLogger getLogger(final String name) {
-        return getLogger(name, null);
+        return getLogger(name, DEFAULT_MESSAGE_FACTORY);
     }
 
     @Override

log4j-to-slf4j/src/main/java/org/apache/logging/slf4j/SLF4JLoggerContext.java

@@ -37,7 +37,7 @@ public Object getExternalContext() {
 
     @Override
     public ExtendedLogger getLogger(final String name) {
-        return getLogger(name, null);
+        return getLogger(name, DEFAULT_MESSAGE_FACTORY);
     }
 
     @Override