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Mapstruct generated class only contains the compile error information. #3812
Replies: 4 comments 4 replies
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Hi @liudongqing Can you provide a github project with a reproducer? Haven't seen something like this before. Thanks in advance! |
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Hi @thunderhook, Just to add on, I encountered this issue today as well.
After some debugging, I discovered that in my case, the mapper in After (shamefully) admitting defeat and resorting to the final trick in the book, I restarted my machine, and the issue no longer occurred. This leads me to suspect there might be a sequencing issue during the compilation and annotation processing phases. I’ll continue to monitor this and report back if I encounter it again. I am using: |
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I also have this problem,But it appears randomly.In my case,i found the "target/generated-sources" directory have the right mapstrcut mapper interface implement ,but the classes directory xxxMapperImpl.class show compile errors like below: @Component
public class SentenceVariantMapperImpl {
public SentenceVariantMapperImpl() {
throw new Error("Unresolved compilation problems: \n\tThe import com.englishlearning.application.content.dto.SentenceVariantDTO cannot be resolved\n\tSentenceVariantMapper cannot be resolved to a type\n\tSentenceVariantDTO cannot be resolved to a type\n\tThe method toDTO(SentenceVariant) of type SentenceVariantMapperImpl must override or implement a supertype method\n\tSentenceVariantDTO cannot be resolved to a type\n\tSentenceVariantDTO cannot be resolved\n\tSentenceVariantDTO cannot be resolved to a type\n\tSentenceVariantDTO cannot be resolved to a type\n\tThe method toDTOList(List<SentenceVariant>) of type SentenceVariantMapperImpl must override or implement a supertype method\n\tSentenceVariantDTO cannot be resolved to a type\n\tSentenceVariantDTO cannot be resolved to a type\n\tThe method toDTO(SentenceVariant) from the type SentenceVariantMapperImpl refers to the missing type SentenceVariantDTO\n\tThe method toEntityList(List<SentenceVariantDTO>) of type SentenceVariantMapperImpl must override or implement a supertype method\n\tSentenceVariantDTO cannot be resolved to a type\n\tSentenceVariantDTO cannot be resolved to a type\n");
}
public SentenceVariantDTO toDTO(SentenceVariant entity) {
throw new Error("Unresolved compilation problems: \n\tSentenceVariantDTO cannot be resolved to a type\n\tThe method toDTO(SentenceVariant) of type SentenceVariantMapperImpl must override or implement a supertype method\n\tSentenceVariantDTO cannot be resolved to a type\n\tSentenceVariantDTO cannot be resolved\n");
}
public SentenceVariant toEntity(SentenceVariantDTO dto) {
throw new Error("Unresolved compilation problem: \n\tSentenceVariantDTO cannot be resolved to a type\n");
}
public List<SentenceVariantDTO> toDTOList(List<SentenceVariant> entityList) {
throw new Error("Unresolved compilation problems: \n\tSentenceVariantDTO cannot be resolved to a type\n\tThe method toDTOList(List<SentenceVariant>) of type SentenceVariantMapperImpl must override or implement a supertype method\n\tSentenceVariantDTO cannot be resolved to a type\n\tSentenceVariantDTO cannot be resolved to a type\n\tThe method toDTO(SentenceVariant) from the type SentenceVariantMapperImpl refers to the missing type SentenceVariantDTO\n");
}
public List<SentenceVariant> toEntityList(List<SentenceVariantDTO> dtoList) {
throw new Error("Unresolved compilation problems: \n\tThe method toEntityList(List<SentenceVariantDTO>) of type SentenceVariantMapperImpl must override or implement a supertype method\n\tSentenceVariantDTO cannot be resolved to a type\n\tSentenceVariantDTO cannot be resolved to a type\n");
}
}jdk version: Oracle OpenJDK 17.0.1 |
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I assume that this is happening in your IDE. MapStruct does not generate the class files. MapStruct only generates java classes, so if something goes wrong then it is either with the IDE or with your build tool |
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I have same problem by use IDEA2025 And maven-3.9.10. Did you find a solution to this problem later? |
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I just found this problem. it took me 4-5Hr for find what happend. |
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Thanks a lot!! Setting |
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I encounter this problem just now. I solve this by alter the interface java file(swap two import line number), then recompile it, and the problem disappeared. A feature of this problem is, in generated calss file, it says 'import xxx.xxx package can't be resolve' which lack the actural class name in the end. which I don't know why. Unresolved compilation problems:
The import com.example.testProject.dto cannot be resolved
The import com.example.testProject.dto cannot be resolved
The import com.example.testProject.entity cannot be resolved
TCategoryConverter cannot be resolved to a type
TCategoryUpdateDTO cannot be resolved to a type
TCategory cannot be resolved to a type
CategoryCreateDTO cannot be resolved to a type
TCategory cannot be resolved to a type |
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I have a spring boot project that uses the maven to build. I use the mapstruct in one class. But when I execute
mvn spring-boot:run, it failed with the message: "Caused by: java.lang.Error: Unresolved compilation problems:". It is very strange as themvn compilecommand can succeed. Then I check the compiled mapper class, it only contains an exception statement, like below:Looks like mapstruct genereted a java file only contains the error throw statement?
I am using :
Java : Java(TM) SE Runtime Environment (build 17.0.12+8-LTS-286) from Oracle
Apache Maven 3.9.9 (8e8579a9e76f7d015ee5ec7bfcdc97d260186937)
Spring boot: 3.4.1
MapStruct: tried both 1.6.3 and 1.5.5 final
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