michael-o commented on code in PR #705:
URL: https://github.com/apache/maven/pull/705#discussion_r847030748


##########
maven-core/src/main/java/org/apache/maven/plugin/internal/ValidatingConfigurationListener.java:
##########
@@ -80,18 +95,83 @@ public void notifyFieldChangeUsingReflection( String 
fieldName, Object value, Ob
     {
         delegate.notifyFieldChangeUsingReflection( fieldName, value, target );
 
-        if ( mojo == target )
+        if ( mojo == target && value != null )
         {
             notify( fieldName, value );
         }
     }
 
     private void notify( String fieldName, Object value )
     {
-        if ( value != null )
+        missingParameters.remove( fieldName );
+
+        if ( logger.isWarnEnabled() )
+        {
+            warnDeprecated( fieldName, value );
+        }
+    }
+
+    private void warnDeprecated( String fieldName, Object value )
+    {
+        Parameter parameter = mojoDescriptor.getParameterMap().get( fieldName 
);
+        String deprecated = parameter.getDeprecated();
+        if ( deprecated != null && !deprecated.isEmpty() )
+        {
+            Object defaultValue = evaluateValue( parameter.getDefaultValue() );
+            if ( !toString( value ).equals( toString( defaultValue ) ) )
+            {
+                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 );

Review Comment:
   Looking into, but this feels extremely ugly and inconsistent (not your 
fault). `MojoDescriptor#getDeprecated()` (sic!) says `true`/`false` as string 
while parameter says nothing. It would expect  same behavior. So if this is 
truly linked to `@deprecated` in Javadoc, then `MojoDescriptor` behavior is 
wrong.
   
   What is `@Deprecated` is given, but not `@deprecated` in Javadoc?
   
   Looking at 
`org.apache.maven.plugin.descriptor.PluginDescriptorBuilderTest.testBuildReader()`
 shows that it is not boolean.



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