More work for #1498: now the original case finally passes

Author: cowtowncoder

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

@@ -8,6 +8,7 @@
 import java.util.concurrent.atomic.AtomicReference;
 
 import com.fasterxml.jackson.annotation.*;
+import com.fasterxml.jackson.annotation.JacksonInject.Value;
 import com.fasterxml.jackson.annotation.JsonCreator.Mode;
 
 import com.fasterxml.jackson.core.JsonParser;
@@ -475,26 +476,37 @@ protected void _addImplicitConstructorCreators(DeserializationContext ctxt,
             CreatorCollectionState ccState, List<CreatorCandidate> ctorCandidates)
                     throws JsonMappingException
     {
+        final DeserializationConfig config = ctxt.getConfig();
         final BeanDescription beanDesc = ccState.beanDesc;
         final CreatorCollector creators = ccState.creators;
         final AnnotationIntrospector intr = ccState.annotationIntrospector();
         final VisibilityChecker<?> vchecker = ccState.vchecker;
         List<AnnotatedWithParams> implicitCtors = null;
+        final boolean preferPropsBased = config.getConstructorDetector().singleArgCreatorDefaultsToProperties();
 
         for (CreatorCandidate candidate : ctorCandidates) {
             final int argCount = candidate.paramCount();
             final AnnotatedWithParams ctor = candidate.creator();
-
             // some single-arg factory methods (String, number) are auto-detected
             if (argCount == 1) {
-                BeanPropertyDefinition propDef = candidate.propertyDef(0);
-                boolean useProps = _checkIfCreatorPropertyBased(intr, ctor, propDef);
+                final BeanPropertyDefinition propDef = candidate.propertyDef(0);
+                final boolean useProps = preferPropsBased || _checkIfCreatorPropertyBased(intr, ctor, propDef);
 
                 if (useProps) {
                     SettableBeanProperty[] properties = new SettableBeanProperty[1];
+                    final JacksonInject.Value injection = candidate.injection(0);
+
+                    // 18-Sep-2020, tatu: [databind#1498] looks like implicit name not linked
+                    //    unless annotation found, so try again from here
                     PropertyName name = candidate.paramName(0);
+                    if (name == null) {
+                        name = candidate.findImplicitParamName(0);
+                        if ((name == null) && (injection == null)) {
+                            continue;
+                        }
+                    }
                     properties[0] = constructCreatorProperty(ctxt, beanDesc, name, 0,
-                            candidate.parameter(0), candidate.injection(0));
+                            candidate.parameter(0), injection);
                     creators.addPropertyCreator(ctor, false, properties);
                 } else {
                     /*boolean added = */ _handleSingleArgumentCreator(creators,

src/test/java/com/fasterxml/jackson/databind/deser/creators/ConstructorDetector1498Test.java

@@ -38,7 +38,7 @@ static class SingleArgNotAnnotated {
 
 //        SingleArgNotAnnotated() { throw new Error("Should not be used"); }
 
-        public SingleArgNotAnnotated(int value) {
+        public SingleArgNotAnnotated(@ImplicitName("value") @com.fasterxml.jackson.annotation.JsonSetter int value) {
             v = value;
         }
     }
@@ -54,6 +54,15 @@ public SingleArgNoMode(@ImplicitName("value") int value) {
         }
     }
 
+    static class SingleArg1498 {
+        final int _bar;
+
+        // note: annotation only to inject "implicit name" without needing parameter-names module
+        SingleArg1498(@ImplicitName("bar") int b) {
+            _bar = b;
+        }
+    }
+
     private final ObjectMapper MAPPER_PROPS = mapperFor(ConstructorDetector.USE_PROPERTIES_BASED);
     private final ObjectMapper MAPPER_DELEGATING = mapperFor(ConstructorDetector.USE_DELEGATING);
     private final ObjectMapper MAPPER_EXPLICIT = mapperFor(ConstructorDetector.EXPLICIT_ONLY);
@@ -64,14 +73,12 @@ public SingleArgNoMode(@ImplicitName("value") int value) {
     /**********************************************************************
      */
 
-    /*
     public void test1ArgDefaultsToPropertiesNonAnnotated() throws Exception
     {
         SingleArgNotAnnotated value = MAPPER_PROPS.readValue(a2q("{'value' : 137 }"),
                 SingleArgNotAnnotated.class);
         assertEquals(137, value.v);
     }
-    */
 
     public void test1ArgDefaultsToPropertiesNoMode() throws Exception
     {
@@ -81,6 +88,15 @@ public void test1ArgDefaultsToPropertiesNoMode() throws Exception
         assertEquals(137, value.v);
     }
 
+    // And specific test for original [databind#1498]
+    public void test1ArgDefaultsToPropertiesIssue1498() throws Exception
+    {
+        // and similarly for mode-less
+        SingleArg1498 value = MAPPER_PROPS.readValue(a2q("{'bar' : 404 }"),
+                SingleArg1498.class);
+        assertEquals(404, value._bar);
+    }
+
     /*
     /**********************************************************************
     /* Test methods, selecting from 1-arg constructors, delegating
@@ -148,12 +164,6 @@ public void test1ArgFailsNoMode() throws Exception
         }
     }
 
-    /*
-    /**********************************************************************
-    /* Test methods
-    /**********************************************************************
-     */
-
     /*
     /**********************************************************************
     /* Helper methods