DeathGun44 commented on code in PR #6158:
URL: https://github.com/apache/fineract/pull/6158#discussion_r3774988708


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integration-tests/src/test/java/org/apache/fineract/integrationtests/client/feign/helpers/LoanProductCommandsApi.java:
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@@ -0,0 +1,60 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.apache.fineract.integrationtests.client.feign.helpers;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import feign.Headers;
+import feign.Param;
+import feign.RequestLine;
+import org.apache.fineract.client.models.PutLoanProductsProductIdResponse;
+
+/**
+ * Loan-product updates that have to send an explicit JSON {@code null}.
+ *
+ * <p>
+ * {@code LoanProductWritePlatformServiceJpaRepositoryImpl} gates the update on
+ * {@code command.parameterExists("delinquencyBucketId")}, so clearing the 
bucket requires the key to be
+ * <em>present</em> with a null value. The generated {@code 
PutLoanProductsProductIdRequest} cannot express that: its
+ * properties are {@code @JsonInclude(USE_DEFAULTS)} and {@code 
ObjectMapperFactory} sets {@code NON_NULL} globally, so
+ * a null field is dropped from the body and the server never takes the 
clearing branch.
+ *
+ * <p>
+ * Marking the field {@code nullable} in the Swagger DTO does not help - the 
generator emits a plain
+ * {@code @Nullable Long}, not a {@code JsonNullable}, so serialisation is 
unchanged. A property-level
+ * {@code @JsonInclude(ALWAYS)} is what actually overrides the mapper default, 
hence this request model.
+ */
+@Headers({ "Accept: application/json", "Content-Type: application/json" })
+public interface LoanProductCommandsApi {

Review Comment:
   Yes, and my comment in the file was likely wrong.
   We already do this elsewhere: DelinquencyRange.id is nullable and comes out 
as JsonNullable<Long>.
   
   Checked both risks: existing callers still compile (normal getter/setter 
stay), and swagger-brake reports no breaking change.
   So I'll mark the field nullable and delete this file. Good catch.



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