fix subclassed exception deserialization (#4847)

release-notes/VERSION-2.x

@@ -4,6 +4,12 @@ Project: jackson-databind
 === Releases === 
 ------------------------------------------------------------------------
 
+2.18.3 (not yet released)
+
+#4827: Subclassed Throwable deserialization fails since v2.18.0 - no creator
+  index for property 'cause'
+ (fix by Joo-Hyuk K)
+
 2.18.2 (27-Nov-2024)
 
 #4733: Wrong serialization of Type Ids for certain types of Enum values

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

@@ -438,20 +438,27 @@ public JsonDeserializer<Object> buildThrowableDeserializer(DeserializationContex
         }
         AnnotatedMethod am = beanDesc.findMethod("initCause", INIT_CAUSE_PARAMS);
         if (am != null) { // should never be null
-            // [databind#3497]: must consider possible PropertyNamingStrategy
-            String name = "cause";
-            PropertyNamingStrategy pts = config.getPropertyNamingStrategy();
-            if (pts != null) {
-                name = pts.nameForSetterMethod(config, am, "cause");
-            }
-            SimpleBeanPropertyDefinition propDef = SimpleBeanPropertyDefinition.construct(ctxt.getConfig(), am,
-                    new PropertyName(name));
-            SettableBeanProperty prop = constructSettableProperty(ctxt, beanDesc, propDef,
-                    am.getParameterType(0));
-            if (prop != null) {
-                // 21-Aug-2011, tatus: We may actually have found 'cause' property
-                //   to set... but let's replace it just in case, otherwise can end up with odd errors.
-                builder.addOrReplaceProperty(prop, true);
+            SettableBeanProperty causeCreatorProp = builder.findProperty(PropertyName.construct("cause"));
+            // [databind#4827] : Consider case where sub-classed `Exception` has `JsonCreator` with `cause` parameter
+            if (causeCreatorProp instanceof CreatorProperty) {
+                // Set fallback-setter as null, so `fixAccess()` does not happen during build
+                ((CreatorProperty) causeCreatorProp).setFallbackSetter(null);
+            } else {
+                // [databind#3497]: must consider possible PropertyNamingStrategy
+                String name = "cause";
+                PropertyNamingStrategy pts = config.getPropertyNamingStrategy();
+                if (pts != null) {
+                    name = pts.nameForSetterMethod(config, am, "cause");
+                }
+                SimpleBeanPropertyDefinition propDef = SimpleBeanPropertyDefinition.construct(ctxt.getConfig(), am,
+                        new PropertyName(name));
+                SettableBeanProperty prop = constructSettableProperty(ctxt, beanDesc, propDef,
+                        am.getParameterType(0));
+                if (prop != null) {
+                    // 21-Aug-2011, tatus: We may actually have found 'cause' property
+                    //   to set... but let's replace it just in case, otherwise can end up with odd errors.
+                    builder.addOrReplaceProperty(prop, true);
+                }
             }
         }
         // update builder now that all information is in?

src/test/java/com/fasterxml/jackson/databind/exc/SubclassedThrowableDeserialization4827Test.java

@@ -0,0 +1,49 @@
+package com.fasterxml.jackson.databind.exc;
+
+import org.junit.jupiter.api.Test;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.testutil.DatabindTestUtil;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+// [databind#4827] Subclassed Throwable deserialization fails since v2.18.0
+//                no creator index for property 'cause'
+public class SubclassedThrowableDeserialization4827Test
+        extends DatabindTestUtil
+{
+
+    public static class SubclassedExceptionJava extends Exception {
+        @JsonCreator
+        public SubclassedExceptionJava(
+                @JsonProperty("message") String message,
+                @JsonProperty("cause") Throwable cause
+        ) {
+            super(message, cause);
+        }
+    }
+
+    private final ObjectMapper MAPPER = jsonMapperBuilder()
+            .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
+            .build();
+
+    @Test
+    public void testDeserialization()
+            throws Exception
+    {
+        // Given input
+        SubclassedExceptionJava input = new SubclassedExceptionJava(
+                "Test Message", new RuntimeException("test runtime cause"));
+
+        // When serialize, then deserialize, round-trip
+        String serialized = MAPPER.writeValueAsString(input);
+        SubclassedExceptionJava deserialized = MAPPER.readValue(serialized, SubclassedExceptionJava.class);
+
+        // Contents are same
+        assertEquals(input.getMessage(), deserialized.getMessage());
+        assertEquals(input.getCause().getMessage(), deserialized.getCause().getMessage());
+    }
+}