diff --git a/extensions/resteasy-reactive/rest-jackson/deployment/src/test/java/io/quarkus/resteasy/reactive/jackson/deployment/test/SimpleJsonResource.java b/extensions/resteasy-reactive/rest-jackson/deployment/src/test/java/io/quarkus/resteasy/reactive/jackson/deployment/test/SimpleJsonResource.java
index 05235155aad78..7abe9104a0b08 100644
--- a/extensions/resteasy-reactive/rest-jackson/deployment/src/test/java/io/quarkus/resteasy/reactive/jackson/deployment/test/SimpleJsonResource.java
+++ b/extensions/resteasy-reactive/rest-jackson/deployment/src/test/java/io/quarkus/resteasy/reactive/jackson/deployment/test/SimpleJsonResource.java
@@ -470,7 +470,8 @@ public ObjectWriter apply(ObjectMapper objectMapper, Type type) {
                 type = ((ParameterizedType) type).getActualTypeArguments()[0];
             }
             if (!type.getTypeName().equals(Person.class.getName())) {
-                throw new IllegalArgumentException("Only Person type can be handled");
+                throw new IllegalArgumentException(
+                        "Type'" + type.getTypeName() + "' cannot be handled. Only 'Person' type is valid");
             }
             return objectMapper.writer().without(JsonWriteFeature.QUOTE_FIELD_NAMES);
         }