diff --git a/maven-core/src/main/java/org/apache/maven/lifecycle/DefaultLifecycleExecutor.java b/maven-core/src/main/java/org/apache/maven/lifecycle/DefaultLifecycleExecutor.java
index 73c6d24ebb..7ec4aa3bbf 100644
--- a/maven-core/src/main/java/org/apache/maven/lifecycle/DefaultLifecycleExecutor.java
+++ b/maven-core/src/main/java/org/apache/maven/lifecycle/DefaultLifecycleExecutor.java
@@ -1614,6 +1614,12 @@ public class DefaultLifecycleExecutor
     //
     public Set<Plugin> getPluginsBoundByDefaultToAllLifecycles( String packaging )
     {
+        if ( logger.isDebugEnabled() )
+        {
+            logger.debug( "Looking up lifecyle mappings for packaging " + packaging + " from "
+                + Thread.currentThread().getContextClassLoader() );
+        }
+
         LifecycleMapping lifecycleMappingForPackaging = lifecycleMappings.get( packaging );
 
         if ( lifecycleMappingForPackaging == null )