Add a failing test for #2974

src/test-jdk14/java/com/fasterxml/jackson/databind/RecordTest.java

@@ -1,8 +1,6 @@
 package com.fasterxml.jackson.databind;
 
-import com.fasterxml.jackson.annotation.JsonCreator;
-import com.fasterxml.jackson.annotation.JsonIgnore;
-import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.*;
 
 import com.fasterxml.jackson.databind.json.JsonMapper;
 import com.fasterxml.jackson.databind.util.ClassUtil;
@@ -148,18 +146,24 @@ public void testDeserializeWithAltCtor() throws Exception {
         assertEquals("name2", value.name());
     }
 
-    public void testSerializeJsonRenameRecord() throws Exception {
+    public void testSerializeJsonRename() throws Exception {
         String json = MAPPER.writeValueAsString(new RecordWithRename(123, "Bob"));
         final Object EXP = map("id", Integer.valueOf(123), "rename", "Bob");
         assertEquals(EXP, MAPPER.readValue(json, Object.class));
     }
 
-    public void testDeserializeJsonRenameRecord() throws Exception {
+    public void testDeserializeJsonRename() throws Exception {
         RecordWithRename value = MAPPER.readValue("{\"id\":123,\"rename\":\"Bob\"}",
                 RecordWithRename.class);
         assertEquals(new RecordWithRename(123, "Bob"), value);
     }
 
+    /*
+    /**********************************************************************
+    /* Internal helper methods
+    /**********************************************************************
+     */
+
     private Map<String,Object> map(String key1, Object value1,
             String key2, Object value2) {
         final Map<String, Object> result = new LinkedHashMap<>();

src/test-jdk14/java/com/fasterxml/jackson/databind/RecordWithJsonSetter2974Test.java

@@ -0,0 +1,61 @@
+package com.fasterxml.jackson.databind;
+
+import java.util.List;
+import java.util.Map;
+
+import com.fasterxml.jackson.annotation.JsonSetter;
+import com.fasterxml.jackson.annotation.Nulls;
+import com.fasterxml.jackson.databind.RecordTest.RecordWithRename;
+import com.fasterxml.jackson.databind.exc.InvalidNullException;
+
+public class RecordWithJsonSetter2974Test extends BaseMapTest
+{
+    record RecordWithNonNullDefs(@JsonSetter(nulls=Nulls.AS_EMPTY) List<String> names,
+            @JsonSetter(nulls=Nulls.FAIL) Map<String, Integer> agesByNames)
+    { }
+
+    private final ObjectMapper MAPPER = newJsonMapper();
+
+    /*
+    /**********************************************************************
+    /* Test methods, Record type introspection
+    /**********************************************************************
+     */
+
+    // [databind#2974]
+    public void testDeserializeWithNullAsEmpty() throws Exception
+    {
+        final ObjectReader r = MAPPER.readerFor(RecordWithNonNullDefs.class);
+        // First, regular case
+        RecordWithNonNullDefs value = r.readValue(a2q(
+"{'names':['bob'],'agesByNames':{'bob':39}}"));
+        assertEquals(1, value.names().size());
+        assertEquals("bob", value.names().get(0));
+        assertEquals(1, value.agesByNames().size());
+        assertEquals(Integer.valueOf(39), value.agesByNames().get("bob"));
+
+        // Then leave out list
+        value = r.readValue(a2q("{'agesByNames':{'bob':42}}"));
+        assertNotNull(value.names());
+        assertEquals(0, value.names().size());
+        assertNotNull(value.agesByNames());
+        assertEquals(1, value.agesByNames().size());
+        assertEquals(Integer.valueOf(42), value.agesByNames().get("bob"));
+
+        assertEquals(new RecordWithRename(123, "Bob"), value);
+    }
+
+    // [databind#2974]
+    public void testDeserializeWithFailForNull() throws Exception
+    {
+        final ObjectReader r = MAPPER.readerFor(RecordWithNonNullDefs.class);
+        // First, regular case
+        // But attempting to leave out Map ought to fail
+        try {
+            /*RecordWithNonNullDefs value =*/ r.readValue(a2q("{'names':['bob']}"));
+            fail("Should not pass with missing/null 'agesByNames'");
+        } catch (InvalidNullException e) {
+            verifyException(e, "property \"agesByNames\"");
+        }
+    }
+}