1. Clone this project repository.
2. Spring Tool Suite or any equivalent IDE -> Import Existing Maven Projects
3. Open ModelmapperMapIssueApplication.java
4. Run As... -> Java Application for a few times.

Observe that inconsistent mapping output as below:

Output 1: { "id": 1000, "sku": "sku1000", "bundleXSelectionProductDetail": { "maxQuantity": 55, "bundleXSelectionProducts": [ { "bundleProductId": 1, "bundleProductSku": "sku1" }, { "bundleProductId": 2, "bundleProductSku": "sku2" } ] } }

Output 2 (without bundleXSelectionProductDetail): { "id": 1000, "sku": "sku1000" }

Actual: The bundleXSelectionProductDetail intermittently being mapped and not mapped.

Expected: The bundleXSelectionProductDetail should always being mapped.