MapStruct demo with Spring and Lombok

It becomes so easy to map Java Beans when using MapStruct, especially in combination with Lombok.

This demo project shows:

• Project setup (Maven libraries and compiler config)

• Specifying default parameters in pom.xml (e.g. constructor injection)

• How to define a mapper interface

• How to map classes where the field names match

• How to map classes where the field names are different

• Using another mapper inside a mapper (to map another class)

• Mapping collections and handling null collections

• Automatically creating a reverse mapping

Simply look through the data classes and the corresponding mappers. There are some notes explaining the usage. Each mapper has a corresponding test to show the expected behaviour.

Generated mappers

After a successful build, you can simply read the code that was generated for your mappers. There is an "Impl" class for each of your mapper interfaces!

Troubleshooting

Occasionally, when changing the Maven pom.xml file, you may have to run mvn clean install to force the mappers to be generated again.

References

The most helpful resource is of course the official MapStruct documentation: https://mapstruct.org/documentation/stable/reference/html/