o using slf4j 1.7.4 which adds the method to clear the logger cache

o update the code to use slf4j 1.7.4
o the logging failures in the embedded ITs are now fixed

maven-embedder/src/main/java/org/apache/maven/cli/logging/impl/Slf4jSimpleConfiguration.java

@@ -58,5 +58,20 @@ public class Slf4jSimpleConfiguration
         // property for root logger level or System.out redirection need to be taken into account
         MavenSlf4jFriend.reset();
         MavenSlf4jSimpleFriend.init();
+        
+        try
+        {
+             org.slf4j.ILoggerFactory loggerFactory = org.slf4j.LoggerFactory.getILoggerFactory();
+             synchronized ( loggerFactory )
+             {
+                 java.lang.reflect.Field loggerMap = loggerFactory.getClass().getDeclaredField( "loggerMap" );
+                 loggerMap.setAccessible( true );
+                 ( (java.util.Map) loggerMap.get( loggerFactory ) ).clear();
+             }
+        }
+        catch ( Exception e )
+        {
+            // ignore for now...
+        }        
     }
 }

maven-embedder/src/main/java/org/slf4j/impl/MavenSlf4jSimpleFriend.java

@@ -28,5 +28,6 @@ public class MavenSlf4jSimpleFriend
     public static void init()
     {
         SimpleLogger.init();
+        SimpleLoggerFactory.INSTANCE.reset();
     }
 }

pom.xml

@@ -59,7 +59,7 @@
     <modelloVersion>1.7</modelloVersion>
     <jxpathVersion>1.3</jxpathVersion>
     <aetherVersion>1.13.1</aetherVersion>
-    <slf4jVersion>1.7.2</slf4jVersion>
+    <slf4jVersion>1.7.4</slf4jVersion>
     <maven.test.redirectTestOutputToFile>true</maven.test.redirectTestOutputToFile>
     <!-- Control the name of the distribution and information output by mvn -->
     <distributionId>apache-maven</distributionId>