Found a bug in MapStruct expressions

Preface MapStruct is a code generator that greatly simplifies the implementation of mappings between Java Bean types based on a conventionally preferred approach to configuration. The generated mapping code uses simple method calls, so it is fast, type-safe and easy to understand. mapStruct’s expression function is designed to deal with the mapping of special object properties, such as the DTO status property into PO status requires further processing, this time you need to use the expression function.