Improve error message for #1516, for 2.8.8: can not quite fix but hope to help with troubleshooting

Author: cowtowncoder

src/main/java/com/fasterxml/jackson/databind/deser/BeanDeserializerFactory.java

@@ -636,9 +636,16 @@ protected void addReferenceProperties(DeserializationContext ctxt,
                     type = ((AnnotatedMethod) m).getParameterType(0);
                 } else {
                     type = m.getType();
+                    // 30-Mar-2017, tatu: Unfortunately it is not yet possible to make back-refs
+                    //    work through constructors; but let's at least indicate the issue for now
+                    if (m instanceof AnnotatedParameter) {
+                        ctxt.reportBadTypeDefinition(beanDesc,
+"Can not bind back references as Creator parameters: type %s (reference '%s', parameter index #%d)",
+beanDesc.getBeanClass().getName(), name, ((AnnotatedParameter) m).getIndex());
+                    }
                 }
                 SimpleBeanPropertyDefinition propDef = SimpleBeanPropertyDefinition.construct(
-                		ctxt.getConfig(), m);
+                        ctxt.getConfig(), m, PropertyName.construct(name));
                 builder.addBackReferenceProperty(name, constructSettableProperty(ctxt,
                         beanDesc, propDef, type));
             }

src/main/java/com/fasterxml/jackson/databind/introspect/BasicBeanDescription.java

@@ -444,7 +444,7 @@ public Map<String,AnnotatedMember> findBackReferenceProperties()
 //        boolean hasIgnored = (_ignoredPropertyNames != null);
 
         for (BeanPropertyDefinition property : _properties()) {
-            /* 23-Sep-2014, tatu: As per [Databind#426], we _should_ try to avoid
+            /* 23-Sep-2014, tatu: As per [databind#426], we _should_ try to avoid
              *   calling accessor, as it triggers exception from seeming conflict.
              *   But the problem is that _ignoredPropertyNames here only contains
              *   ones ignored on per-property annotations, but NOT class annotations...