Fixed #2757

release-notes/CREDITS-2.x

@@ -1081,26 +1081,26 @@ Robert Diebels (RobertDiebels@github)
 Joseph Koshakow (jkosh44@github)
   * Contributed fix for #2515: `ObjectMapper.registerSubtypes(NamedType...)` doesn't allow registering
     the same POJO for two different type ids
- (2.11.0)
+  (2.11.0)
 
 Haowei Wen (yushijinhun@github)
   * Reported #2565: Java 8 `Optional` not working with `@JsonUnwrapped` on unwrappable type
- (2.11.0)
+  (2.11.0)
 
 Bartosz Baranowski (baranowb@github)
   * Reported #2589: `DOMDeserializer`: setExpandEntityReferences(false) may not prevent
    external entity expansion in all cases
- (2.11.0)
+  (2.11.0)
 
 Oleksii Khomchenko (gagoman@github)
   * Reported, contributed fix for #2592: `ObjectMapper.setSerializationInclusion()` is
    ignored for `JsonAnyGetter`
- (2.11.0)
+  (2.11.0)
 
 Oleksandr Poslavskyi (alevskyi@github)
   * Contributed fix for #1983: Polymorphic deserialization should handle case-insensitive Type Id
     property name if `MapperFeature.ACCEPT_CASE_INSENSITIVE_PROPERTIES` is enabled
- (2.11.0)
+  (2.11.0)
 
 Simone D'Avico (simonedavico@github)
   * Reported #2632: Failure to resolve generic type parameters on serialization
@@ -1125,3 +1125,7 @@ Johannes Kuhn (DasBrain@github)
     deserializer properties
   (2.11.1)
 
+Frank Schmager (fschmager@github)
+  * Reported #2757: "Conflicting setter definitions for property" exception for `Map`
+   subtype during deserialization
+  (2.11.1)

release-notes/VERSION-2.x

@@ -14,6 +14,9 @@ Project: jackson-databind
 #2755: `StdSubtypeResolver` is not thread safe (possibly due to copy
   not being made with `ObjectMapper.copy()`)
  (reported by tjwilson90@github)
+#2757: "Conflicting setter definitions for property" exception for `Map`
+  subtype during deserialization
+ (reported by Frank S)
 #2759: Rearranging of props when property-based generator is in use leads
   to incorrect output
  (reported by Oleg C)

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

@@ -224,12 +224,15 @@ public AnnotatedMember getNonConstructorMutator() {
      * the highest precedence in current context (getter method when serializing,
      * if available, and so forth), if any.
      *<p>
+     * Note: may throw {@link IllegalArgumentException} in case problems are found
+     * trying to getter or setter info.
+     *<p>
      * Note: abstract since 2.5
      * 
      * @since 2.1
      */
     public abstract AnnotatedMember getPrimaryMember();
-    
+
     /*
     /**********************************************************
     /* More refined access to configuration features

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

@@ -239,16 +239,20 @@ public PropertyMetadata getMetadata() {
      * Helper method that contains logic for accessing and merging all setter
      * information that we needed, regarding things like possible merging
      * of property value, and handling of incoming nulls.
+     * Only called for deserialization purposes.
      */
     protected PropertyMetadata _getSetterInfo(PropertyMetadata metadata)
     {
         boolean needMerge = true;
         Nulls valueNulls = null;
         Nulls contentNulls = null;
-        
+
         // Slightly confusing: first, annotations should be accessed via primary member
-        // (mutator); but accessor is needed for actual merge operation. So:
-        AnnotatedMember prim = getPrimaryMember();
+        // (mutator); but accessor is needed for actual merge operation. So
+
+        // 20-Jun-2020, tatu: Unfortunately strict checks lead to [databind#2757]
+        //   so we will need to try to avoid them at this point
+        AnnotatedMember prim = getPrimaryMemberUnchecked();
         AnnotatedMember acc = getAccessor();
 
         if (prim != null) {
@@ -272,7 +276,10 @@ protected PropertyMetadata _getSetterInfo(PropertyMetadata metadata)
             // If not, config override?
             // 25-Oct-2016, tatu: Either this, or type of accessor...
             if (needMerge || (valueNulls == null) || (contentNulls == null)) {
-                Class<?> rawType = getRawPrimaryType();
+                // 20-Jun-2020, tatu: Related to [databind#2757], need to find type
+                //   but keeping mind that type for setters is trickier; and that
+                //   generic typing gets tricky as well.
+                Class<?> rawType = _rawTypeOf(prim);
                 ConfigOverride co = _config.getConfigOverride(rawType);
                 JsonSetter.Value setterInfo = co.getSetterInfo();
                 if (setterInfo != null) {
@@ -330,7 +337,6 @@ public JavaType getPrimaryType() {
                     // 09-Feb-2017, tatu: Not sure if this or `null` but...
                     return TypeFactory.unknownType();
                 }
-                return m.getType();
             }
             return m.getType();
         }
@@ -577,6 +583,45 @@ public AnnotatedMember getPrimaryMember() {
         return m;
     }
 
+    // Sometimes we need to actually by-pass failures related to conflicting
+    // getters or setters (see [databind#2757] for specific example); if so,
+    // this method is to be used instead of `getPrimaryMember()`
+    // @since 2.11.1
+    protected AnnotatedMember getPrimaryMemberUnchecked() {
+        if (_forSerialization) { // Inlined `getAccessor()` logic:
+            // Inlined `getGetter()`:
+            if (_getters != null) {
+                return _getters.value;
+            }
+            // Inlined `getField()`:
+            if (_fields != null) {
+                return _fields.value;
+            }
+            return null;
+        }
+
+        // Otherwise, inlined `getMutator()` logic:
+
+        // Inlined `getConstructorParameter()`:
+        if (_ctorParameters != null) {
+            return _ctorParameters.value;
+        }
+        // Inlined `getSetter()`:
+        if (_setters != null) {
+            return _setters.value;
+        }
+        // Inlined `getField()`:
+        if (_fields != null) {
+            return _fields.value;
+        }
+        // but to support setterless-properties, also include part of
+        // `getAccessor()` not yet covered, `getGetter()`:
+        if (_getters != null) {
+            return _getters.value;
+        }
+        return null;
+    }
+
     protected int _getterPriority(AnnotatedMethod m)
     {
         final String name = m.getName();
@@ -1220,6 +1265,26 @@ protected <T> T fromMemberAnnotationsExcept(WithMember<T> func, T defaultValue)
         return null;
     }
 
+    // Helper method needed to work around oddity in type access for
+    // `AnnotatedMethod`.
+    //
+    // @since 2.11.1
+    protected Class<?> _rawTypeOf(AnnotatedMember m) {
+        // AnnotatedMethod always returns return type, but for setters we
+        // actually need argument type
+        if (m instanceof AnnotatedMethod) {
+            AnnotatedMethod meh = (AnnotatedMethod) m;
+            if (meh.getParameterCount() > 0) {
+                // note: get raw type FROM full type since only that resolves
+                // generic types
+                return meh.getParameterType(0).getRawClass();
+            }
+        }
+        // same as above, must get fully resolved type to handled generic typing
+        // of fields etc.
+        return m.getType().getRawClass();
+    }
+
     /*
     /**********************************************************
     /* Helper classes

src/test/java/com/fasterxml/jackson/databind/deser/jdk/MapDeser2757Test.java

@@ -0,0 +1,32 @@
+package com.fasterxml.jackson.databind.deser.jdk;
+
+import java.util.*;
+
+import com.fasterxml.jackson.databind.*;
+
+@SuppressWarnings("serial")
+public class MapDeser2757Test extends BaseMapTest
+{
+    static class MyMap extends LinkedHashMap<String, String> {
+        public MyMap() { }
+
+        public void setValue(StringWrapper w) { }
+        public void setValue(IntWrapper w) { }
+
+        public long getValue() { return 0L; }
+    }
+
+    // [databind#2757]: should allow deserialization as Map despite conflicting setters
+    public void testCanDeserializeMap() throws Exception
+    {
+        final ObjectMapper mapper = jsonMapperBuilder()
+                .build();
+
+        MyMap input = new MyMap();
+        input.put("a", "b");
+        final String json = mapper.writeValueAsString(input);
+        MyMap x = mapper.readValue(json, MyMap.class);
+        assertEquals(1, x.size());
+        assertEquals("b", input.get("a"));
+    }
+}