Fix handling of ObjectId-property in JsonIdentityInfo for uniform deserialization

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

@@ -373,6 +373,10 @@ public Object deserializeFromObject(JsonParser p, DeserializationContext ctxt) t
                 _handleTypedObjectId(p, ctxt, bean, id);
             }
         }
+        // [databind#3838]: since 2.16 Uniform handling of missing objectId
+        if (_objectIdReader != null && p.getCurrentToken() == JsonToken.END_OBJECT) {
+            ctxt.reportUnresolvedObjectId(_objectIdReader, bean);
+        }
         if (_injectables != null) {
             injectValues(ctxt, bean);
         }

src/test/java/com/fasterxml/jackson/databind/deser/JsonIdentityInfoIdProperty3838Test.java

@@ -0,0 +1,197 @@
+package com.fasterxml.jackson.databind.deser;
+
+import com.fasterxml.jackson.annotation.*;
+import com.fasterxml.jackson.databind.BaseMapTest;
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.exc.MismatchedInputException;
+
+// [databind#3838]: Difference in the handling of ObjectId-property in JsonIdentityInfo depending on the deserialization route.
+public class JsonIdentityInfoIdProperty3838Test extends BaseMapTest {
+
+    /*
+    /**********************************************************
+    /* Set Up
+    /**********************************************************
+    */
+    interface ResultGetter {
+        String result();
+    }
+
+    @JsonIdentityInfo(property = "id", generator = ObjectIdGenerators.PropertyGenerator.class)
+    static class SetterBased implements ResultGetter {
+        private String id;
+
+        public String getId() {
+            return id;
+        }
+
+        public void setId(String id) {
+            this.id = id;
+        }
+
+        @Override
+        public String result() {
+            return id;
+        }
+    }
+
+    @JsonIdentityInfo(property = "id", generator = ObjectIdGenerators.PropertyGenerator.class)
+    static class CreatorBased implements ResultGetter {
+        private final String id;
+
+        @JsonCreator
+        CreatorBased(@JsonProperty(value = "id") String id) {
+            this.id = id;
+        }
+
+        public String getId() {
+            return id;
+        }
+
+        @Override
+        public String result() {
+            return id;
+        }
+    }
+
+    @JsonIdentityInfo(property = "id", generator = ObjectIdGenerators.PropertyGenerator.class)
+    static class DefaultConstructorBased implements ResultGetter {
+        public String id;
+
+        @Override
+        public String result() {
+            return id;
+        }
+    }
+
+    @JsonIdentityInfo(property = "id", generator = ObjectIdGenerators.PropertyGenerator.class)
+    static class StaticFactoryMethodBased implements ResultGetter {
+        private final String id;
+
+        private StaticFactoryMethodBased(String id) {
+            this.id = id;
+        }
+
+        public String getId() {
+            return id;
+        }
+
+        @JsonCreator
+        public static StaticFactoryMethodBased create(@JsonProperty("id") String id) {
+            return new StaticFactoryMethodBased(id);
+        }
+
+        @Override
+        public String result() {
+            return id;
+        }
+    }
+
+    @JsonIdentityInfo(property = "id", generator = ObjectIdGenerators.PropertyGenerator.class)
+    static class MultiArgConstructorBased implements ResultGetter {
+        private final String id;
+        private final int value;
+
+        @JsonCreator
+        MultiArgConstructorBased(@JsonProperty("id") String id, @JsonProperty("value") int value) {
+            this.id = id;
+            this.value = value;
+        }
+
+        public String getId() {
+            return id;
+        }
+
+        public int getValue() {
+            return value;
+        }
+
+        @Override
+        public String result() {
+            return id;
+        }
+    }
+
+    @JsonIdentityInfo(
+        generator = ObjectIdGenerators.PropertyGenerator.class,
+        property = "id"
+    )
+    @JsonTypeInfo(
+        use = JsonTypeInfo.Id.NAME,
+        include = JsonTypeInfo.As.WRAPPER_OBJECT,
+        property = "type"
+    )
+    @JsonSubTypes({
+        @JsonSubTypes.Type(value = Concrete3838.class, name = "concrete_3838")
+    })
+    static class BaseType3838 implements ResultGetter {
+        public String id;
+
+        @Override
+        public String result() {
+            return id;
+        }
+    }
+
+    @JsonTypeName("concrete_3838")
+    static class Concrete3838 extends BaseType3838 {
+        public String location;
+
+        protected Concrete3838() {}
+
+        public Concrete3838(String id, String loc) {
+            this.id = id;
+            location = loc;
+        }
+    }
+
+    @JsonIdentityInfo(generator = ObjectIdGenerators.IntSequenceGenerator.class, property = "id")
+    static class IntSequencedBean implements ResultGetter{
+        public String value;
+
+        @Override
+        public String result() {
+            return value;
+        }
+    }
+
+    /*
+    /**********************************************************
+    /* Test
+    /**********************************************************
+    */
+
+    private final ObjectMapper MAPPER = newJsonMapper();
+
+    final static Object[][] CLASS_AND_JSON_STRING = new Object[][]{
+        {SetterBased.class, "{'id':'great'}"},
+        {CreatorBased.class, "{'id':'great'}"},
+        {DefaultConstructorBased.class, "{'id':'great'}"},
+        {StaticFactoryMethodBased.class, "{'id':'great'}"},
+        {MultiArgConstructorBased.class, "{'id':'great','value':42}"},
+        {BaseType3838.class, "{'concrete_3838':{'id':'great','location':'Bangkok'}}"},
+        {IntSequencedBean.class, "{'id':-1,'value':'great'}"}
+    };
+
+    public void testUniformHandlingForMissingObjectId() throws Exception {
+        for (Object[] classAndJsonStrEntry : CLASS_AND_JSON_STRING) {
+            final Class<?> cls = (Class<?>) classAndJsonStrEntry[0];
+            final String jsonStr = (String) classAndJsonStrEntry[1];
+
+            // 1. throws MismatchedInputException with empty JSON object
+            try {
+                MAPPER.readValue("{}", cls);
+                fail("should not pass");
+            } catch (MismatchedInputException e) {
+                verifyException(e,
+                    "No Object Id found for an instance of", "to",
+                    "to assign to property 'id'");
+            }
+
+            // 2. but works with non-empty JSON object
+            ResultGetter nonEmptyObj = (ResultGetter) MAPPER.readValue(a2q(jsonStr), cls);
+            assertEquals("great", nonEmptyObj.result());
+        }
+    }
+}