[FIXED] Lombok causing MapStruct compileJava build failure after upgrading to Gradle 5.0

Issue

We are trying to upgrade from Gradle 4.5 to 5.0. After upgrade, compileJava is failing because Mapstruct is not able to resolve values (getters not available obviously) used in @Mapping annotation. This was working fine in Gradle 4.5 .

The code is like this

@Mapper(componentModel = "spring")
public interface CAndACodeGenConverter extends BaseConverter<CGen, AGen> {

    @Mapping(target = "owner", source = "owner.name")
    @Mapping(target = "useCA", source = "defaultCA")
    AGen convertToDto(CGen entity);
}

Our build.gradle is like this

    mapstructVersion = "1.4.1.Final"
    lombokVersion = "1.18.12"
    lombokMapstructBindingVersion = "0.2.0"

    compileOnly('org.projectlombok:lombok:1.18.12')
    compile("org.mapstruct:mapstruct:${mapstructVersion}")
    implementation "org.mapstruct:mapstruct:${mapstructVersion}", "org.projectlombok:lombok:${lombokVersion}"
    annotationProcessor "org.mapstruct:mapstruct-processor:${mapstructVersion}", "org.projectlombok:lombok-mapstruct-binding:${lombokMapstructBindingVersion}"
 

The error we are getting is

error: No property named "owner.name" exists in source parameter(s). Did you mean "null"?

This was working fine in Gradle 4.5 .

Solution

Try to change dependencies order like below:

compileOnly "org.projectlombok:lombok:$lombokVersion"
compileOnly "org.mapstruct:mapstruct:${mapstructVersion}"
annotationProcessor "org.projectlombok:lombok-mapstruct-binding:0.2.0"
annotationProcessor "org.mapstruct:mapstruct-processor:${mapstructVersion}"
annotationProcessor "org.projectlombok:lombok:$lombokVersion"

I've tested it just now and it works.

P.S. IDK why this order is required, got it from lombok-mapstruct-binding related article long time ago

Answered By - RomanMitasov