slawekjaranowski commented on a change in pull request #285:
URL: https://github.com/apache/maven/pull/285#discussion_r829754730



##########
File path: 
maven-core/src/main/java/org/apache/maven/plugin/internal/ValidatingConfigurationListener.java
##########
@@ -94,4 +111,53 @@ private void notify( String fieldName, Object value )
         }
     }
 
+    private void warnDeprecated( String fieldName, Object value )
+    {
+        Parameter parameter = mojoDescriptor.getParameterMap().get( fieldName 
);
+        String deprecated = parameter.getDeprecated();
+        if ( deprecated != null && !deprecated.isEmpty() )
+        {
+            if ( !toString( value ).equals( toString( 
parameter.getDefaultValue() ) ) )
+            {
+                StringBuilder sb = new StringBuilder( "  Parameter '" );
+                sb.append( fieldName ).append( '\'' );
+                if ( parameter.getExpression() != null )
+                {
+                    String userProperty = parameter.getExpression().replace( 
"${", "'" ).replace( '}', '\'' );
+                    sb.append( " (User Property " ).append( userProperty 
).append( ")" );
+                }
+                sb.append( " is deprecated. " ).append( deprecated );
+
+                logger.warn( MessageUtils.buffer().warning( sb.toString() 
).toString() );
+            }
+        }
+    }
+
+    /**
+     * Creates a human-friendly string representation of the specified object.
+     *
+     * @param obj The object to create a string representation for, may be 
<code>null</code>.
+     * @return The string representation, never <code>null</code>.
+     */
+    private String toString( Object obj )

Review comment:
       
https://github.com/apache/maven-assembly-plugin/blob/master/src/main/java/org/apache/maven/plugins/assembly/archive/DefaultAssemblyArchiver.java#L439
   
   
https://github.com/apache/maven-mvnd/blob/055e50feb52ff3155b7fcf254e99901e1928c7fd/daemon/src/main/java/org/mvndaemon/mvnd/plugin/CliMavenPluginManager.java#L555
   
   So maybe better will be use `DebugConfigurationListener` instead of 
duplicate code?




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