Merge branch '2.19'

release-notes/CREDITS-2.x

@@ -1850,6 +1850,9 @@ wrongwrong (@k163377)
  * Contributed #4749: Fixed problem in StdDelegatingSerializer#serializeWithType where final
    serializer lookup was done on the pre-converted value when _delegateSerializer was null
   (2.18.1)
+ * Reported #4878: When serializing a Map via Converter(StdDelegatingSerializer),
+   a NullPointerException is thrown due to missing key serializer
+  (2.18.3)
 
 Bernd Ahlers (@bernd)
  * Reported #4742: Deserialization with Builder, External type id, `@JsonCreator` failing

release-notes/VERSION-2.x

@@ -58,6 +58,9 @@ Project: jackson-databind
   multiple constructors since 2.18
  (reported by Tomáš P)
  (fix by Joo-Hyuk K, @cowtowncoder)
+#4878: When serializing a Map via Converter(StdDelegatingSerializer),
+  a NullPointerException is thrown due to missing key serializer
+ (reported by @wrongwrong)
 #4908: Deserialization behavior change with @JsonCreator and
   @ConstructorProperties between 2.17 and 2.18
  (reported by Gustavo B)

src/test/java/tools/jackson/databind/convert/MapConversion4878Test.java

@@ -0,0 +1,62 @@
+package tools.jackson.databind.convert;
+
+import java.util.Collections;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+
+import com.fasterxml.jackson.annotation.JsonFormat;
+
+import tools.jackson.databind.*;
+import tools.jackson.databind.module.SimpleModule;
+import tools.jackson.databind.module.SimpleSerializers;
+import tools.jackson.databind.ser.std.StdDelegatingSerializer;
+import tools.jackson.databind.testutil.DatabindTestUtil;
+import tools.jackson.databind.util.StdConverter;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class MapConversion4878Test extends DatabindTestUtil
+{
+    // [databind#4878]
+    static class MapWrapper4878 {
+        final Map<String, Object> value;
+
+        MapWrapper4878(Map<String, Object> value) {
+            this.value = value;
+        }
+    }
+
+    static class WrapperConverter4878 extends StdConverter<MapWrapper4878, Object> {
+        @Override
+        public Object convert(MapWrapper4878 value) {
+            return value.value;
+        }
+    }
+
+    @SuppressWarnings("serial")
+    static class Serializers4878 extends SimpleSerializers {
+        @Override
+        public ValueSerializer<?> findSerializer(SerializationConfig config,
+                JavaType type, BeanDescription beanDesc, JsonFormat.Value formatOverrides) {
+            Class<?> rawClass = type.getRawClass();
+            if (MapWrapper4878.class.isAssignableFrom(rawClass)) {
+                return new StdDelegatingSerializer(new WrapperConverter4878());
+            }
+            return super.findSerializer(config, type, beanDesc, formatOverrides);
+        }
+    }
+
+    // [databind#4878]
+    @Test
+    public void testMapConverter() throws Exception
+    {
+        SimpleModule sm = new SimpleModule();
+        sm.setSerializers(new Serializers4878());
+        final ObjectMapper mapper = jsonMapperBuilder()
+                .addModule(sm)
+                .build();
+        String json = mapper.writeValueAsString(new MapWrapper4878(Collections.singletonMap("a", 1)));
+        assertEquals(a2q("{'a':1}"), json);
+    }
+}

src/test/java/tools/jackson/databind/convert/MapConversionsTest.java

@@ -15,16 +15,14 @@
 
 public class MapConversionsTest
 {
-    final ObjectMapper MAPPER = newJsonMapper();
-
     enum AB { A, B; }
 
     static class Bean {
         public Integer A;
         public String B;
     }
 
-    // [Issue#287]
+    // [databind#287]
 
     @JsonSerialize(converter=RequestConverter.class)
     static class Request {
@@ -50,6 +48,8 @@ public Map<String,Object> convert(final Request value) {
     /**********************************************************
      */
 
+    private final ObjectMapper MAPPER = newJsonMapper();
+
     /**
      * Test that verifies that we can go between couple of types of Maps...
      */

src/test/java/tools/jackson/databind/records/RecordJsonSerDeser188Test.java

@@ -43,6 +43,7 @@ public void serialize(String value, JsonGenerator jgen, SerializationContext pro
         }
     }
 
+    @SuppressWarnings("serial")
     static class PrefixStringDeserializer extends StdScalarDeserializer<String>
     {
         protected PrefixStringDeserializer() {