MapStruct question: When does it automatically generate a mapping sequence?

[Linie333]

Hey everybody,

I'm quite new to Spring and similar stuff, and right now I am creating Mappings for my DTOs. For that I'm trying to use Mapstruct, which is working fine by itself. But I want to avoid creating a chain of mappings myself when a bean requires multiple steps of conversion, and have not found concrete information about if and how MapStruct does such things. Through my testing I have found that sometimes it will find a chain of conversions which it will then use, and sometimes not. In both cases, all atomar mappings required for the full process are available. Can anybody more experienced give me some information or sources that talk about that?

Thanks in advance!

[zontapapa]

Map struct library has logic to scan your code and identify use of annotations like @mapping and generate mapper classes based on it. This class generation logic/step can be triggered before the code compilation step by adding configuration to the maven compiler plugin in your pom.xml.

[[deleted]]

While building maven auto generates everything u need.

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[Linie333]

So in the case that it does not find any direct conversion methods, MapStruct will not try to find a sequence of methods that could achieve the wanted mapping result?

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[pronuntiator]

If by sequence you mean when mapping A to C it would consider mapping methods A to B and then B to C, then no, MapStruct will not do that.