Spring Boot 2 MongoDB @TypeAlias does not work [DATAMONGO-2466]

Markus opened DATAMONGO-2466 and commented

In SpringBoot 1 TypeAlias(“name”) does work as expected but if I migrate to SpringBoot 2 it doesn’t instantiate the classes correctly.

@Document(collection = "test")
@TypeAlias("y")
public class TestY extends Test {

private String y;

public String getY() {
 return y;
 }

public void setY(String y) {
 this.y = y;
 }
}

@Document(collection = "test")
public class Test {
 @Id
 protected String id;

public Test() {
 this.id = id;
 }
}

@Document(collection = "test")
@TypeAlias("x")
public class TestX extends Test {

private String x;

public String getX() {
 return x;
 }

public void setX(String x) {
 this.x = x;
 }
}

Executions:

If I only load the instances -> Test instances should be TestX or TestY but they are all Test

List<Test> test = testRepository.findAll(); 

If I save before the entities -> Test instances after loading are instantiated right as TestX and TestY

 TestY y = new TestY();
 y.setY("y");
 testRepository.save(y);

TestX x = new TestX();
 x.setX("x");
 testRepository.save(x);
 List<Test> test = testRepository.findAll();

In Spring Boot 1 it works as expected.

Dependencies

before: spring-boot-starter-data-mongodb-1.5.21.RELEASE

after: spring-boot-starter-data-mongodb-2.1.11.RELEASE

Repositories

@Repository
public interface TestRepository extends MongoRepository<Test, String> {

}

---

Affects: 2.1.16 (Lovelace SR16)

1 votes, 2 watchers

[mp911de]

Please annotate your domain types with @Document. The type alias annotation isn’t sufficient to associate entity classes with the MongoMappingContext. The entity scan at application startup discovers and registers type aliases for proper instantiation.

[mp911de]

Closing as entity scan of classes annotated with @Document works as designed.