Index: log4j-samples/loggerProperties/src/main/java/org/apache/logging/log4j/lookup/MapMessageLookup.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- log4j-samples/loggerProperties/src/main/java/org/apache/logging/log4j/lookup/MapMessageLookup.java	(date 1496966559000)
+++ log4j-samples/loggerProperties/src/main/java/org/apache/logging/log4j/lookup/MapMessageLookup.java	(date 1547130885000)
@@ -23,6 +23,7 @@
 import org.apache.logging.log4j.core.config.plugins.Plugin;
 import org.apache.logging.log4j.core.lookup.AbstractLookup;
 import org.apache.logging.log4j.core.lookup.StrLookup;
+import org.apache.logging.log4j.message.MapMessage;
 import org.apache.logging.log4j.message.StringMapMessage;
 import org.apache.logging.log4j.message.Message;
 import org.apache.logging.log4j.status.StatusLogger;
@@ -52,7 +53,7 @@
     @Override
     public String lookup(final LogEvent event, final String key) {
         final Message msg = event.getMessage();
-        if (msg instanceof StringMapMessage) {
+        if (msg instanceof MapMessage) {
             try {
                 final Map<String, String> properties = ((StringMapMessage) msg).getData();
                 if (properties == null) {
Index: log4j-core/src/main/java/org/apache/logging/log4j/core/lookup/MapLookup.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- log4j-core/src/main/java/org/apache/logging/log4j/core/lookup/MapLookup.java	(date 1496966559000)
+++ log4j-core/src/main/java/org/apache/logging/log4j/core/lookup/MapLookup.java	(date 1547130487000)
@@ -22,7 +22,7 @@
 
 import org.apache.logging.log4j.core.LogEvent;
 import org.apache.logging.log4j.core.config.plugins.Plugin;
-import org.apache.logging.log4j.message.StringMapMessage;
+import org.apache.logging.log4j.message.MapMessage;
 
 /**
  * A map-based lookup.
@@ -118,7 +118,7 @@
 
     @Override
     public String lookup(final LogEvent event, final String key) {
-        final boolean isMapMessage = event != null && event.getMessage() instanceof StringMapMessage;
+        final boolean isMapMessage = event != null && event.getMessage() instanceof MapMessage;
         if (map == null && !isMapMessage) {
             return null;
         }
@@ -129,7 +129,7 @@
             }
         }
         if (isMapMessage) {
-            return ((StringMapMessage) event.getMessage()).get(key);
+            return ((MapMessage) event.getMessage()).get(key);
         }
         return null;
     }
Index: log4j-core/src/main/java/org/apache/logging/log4j/core/pattern/MapPatternConverter.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- log4j-core/src/main/java/org/apache/logging/log4j/core/pattern/MapPatternConverter.java	(date 1496966559000)
+++ log4j-core/src/main/java/org/apache/logging/log4j/core/pattern/MapPatternConverter.java	(date 1547130487000)
@@ -18,7 +18,7 @@
 
 import org.apache.logging.log4j.core.LogEvent;
 import org.apache.logging.log4j.core.config.plugins.Plugin;
-import org.apache.logging.log4j.message.StringMapMessage;
+import org.apache.logging.log4j.message.MapMessage;
 import org.apache.logging.log4j.util.IndexedReadOnlyStringMap;
 
 /**
@@ -60,9 +60,9 @@
      */
     @Override
     public void format(final LogEvent event, final StringBuilder toAppendTo) {
-        StringMapMessage msg;
-        if (event.getMessage() instanceof StringMapMessage) {
-            msg = (StringMapMessage) event.getMessage();
+        MapMessage msg;
+        if (event.getMessage() instanceof MapMessage) {
+            msg = (MapMessage) event.getMessage();
         } else {
             return;
         }