mapstruct-protobuf3 use lombok:UnsupportedOperationException(Collections$UnmodifiableCollection)

Nadie ha tomado este issue todavía.

modify mapstruct-protobuf3/usage/pom.xml plugin config,

org.mapstruct
mapstruct-processor
${org.mapstruct.version}

org.projectlombok
lombok
${org.projectlombok.version}

org.projectlombok
lombok-mapstruct-binding
${lombok-mapstruct-binding.version}

org.mapstruct.examples.spi
protobuf-spi-impl
1.0.0

`

rebuild the mapstruct-protobuf3, run the test,report an error
`java.lang.UnsupportedOperationException
at java.util.Collections$UnmodifiableCollection.addAll(Collections.java:1065)
at org.mapstruct.example.mapper.UserMapperImpl.map(UserMapperImpl.java:34)
at org.mapstruct.example.ProtobufTest.test(ProtobufTest.java:33)，`

Partially generated code

```
if ( userDTO.getMainDepartmentsList() != null ) {
List list = departmentListToDepartmentDTOList( user.getMainDepartments() );
if ( list != null ) {
userDTO.getMainDepartmentsList().addAll( list );
}

}
if ( userDTO.getDepartmentsList() != null ) {

List list1 = departmentListToDepartmentDTOList( user.getDepartments() );
if ( list1 != null ) {
userDTO.getDepartmentsList().addAll( list1 );
}
```

recover mapstruct-protobuf3/usage/pom.xml plugin config, run test success.
Is there any way to solve this problem?

Comienza con mapstruct-protobuf3/usage/pom.xml e inspecciona la configuración de annotationProcessorPaths que se muestra en el issue. Reconstruye el ejemplo mapstruct-protobuf3 y ejecuta mapstruct-protobuf3/usage/src/test/.../ProtobufTest.java, comprobando el código generado de UserMapperImpl.java y confirmando que el test finaliza sin UnsupportedOperationException.

Escrito por el modelo de indexación a partir del texto del issue.