Record with "is" prefixed Boolean field causes unmapped source property report

[KENNYSOFT]

Given files:

MemberDto.java

package org.mapstruct.itest.records;

public record MemberDto(Boolean isActive, Boolean premium) {

}

MemberEntity.java

package org.mapstruct.itest.records;

public class MemberEntity {

    private Boolean isActive;
    private Boolean premium;

    public Boolean getIsActive() {
        return isActive;
    }

    public void setIsActive(Boolean isActive) {
...

MemberMapper.java

package org.mapstruct.itest.records;

import org.mapstruct.Mapper;
import org.mapstruct.Mapping;
import org.mapstruct.ReportingPolicy;
import org.mapstruct.factory.Mappers;

@Mapper(unmappedSourcePolicy = ReportingPolicy.ERROR)
public interface MemberMapper {

    MemberMapper INSTANCE = Mappers.getMapper( MemberMapper.class );

    MemberEntity fromRecord(MemberDto record);

    MemberDto toRecord(MemberEntity entity);

}

And following method added to org.mapstruct.itest.records.RecordsTest:

import org.mapstruct.itest.records.MemberDto;
import org.mapstruct.itest.records.MemberEntity;
import org.mapstruct.itest.records.MemberMapper;

...

    @Test
    public void shouldMapMemberRecord() {
        MemberEntity member = MemberMapper.INSTANCE.fromRecord( new MemberDto( true, false ) );

        assertThat( member ).isNotNull();
        assertThat( member.getIsActive() ).isTrue();
        assertThat( member.getPremium() ).isFalse();
    }

    @Test
    public void shouldMapIntoMemberRecord() {
        MemberEntity entity = new MemberEntity();
        entity.setIsActive( false );
        entity.setPremium( true );

        MemberDto value = MemberMapper.INSTANCE.toRecord( entity );

        assertThat( value ).isNotNull();
        assertThat( value.isActive() ).isEqualTo( false );
        assertThat( value.premium() ).isEqualTo( true );
    }

Test failed with compilation error:

[ERROR] /.../mapstruct/integrationtest/target/tmp/org.mapstruct.itest.tests.recordsTest/javac/src/main/java/org/mapstruct/itest/records/MemberMapper.java:[22,18] Unmapped source property: "active".

If I remove unmappedSourcePolicy from @Mapping, it just passes well.

(But actually I cannot find any warning when I removed unmappedSourcePolicy, maybe the maven test task just remove warnings?)

Environment

MapStruct 1.5.0-SNAPSHOT (as of 8b84f5b)

Java

openjdk version "17" 2021-09-14 LTS
OpenJDK Runtime Environment Zulu17.28+13-CA (build 17+35-LTS)
OpenJDK 64-Bit Server VM Zulu17.28+13-CA (build 17+35-LTS, mixed mode, sharing)

[filiphr]

Thanks for the detailed example. It really helped us find the problem and prepare a fix in PR #2612

The reason why it works when you remove unmappedSourcePolicy is because the default value for that is ignore, so it is ignore. If you set it to ReportPolicy.WARNING you'll see a warning.

[KENNYSOFT]

Cool. Thanks for preparing the fix and really looking forward to the merge.