AggregateReference conversion does not honor custom converters

[kota65535]

Given MySQL table schema, entity class and custom converter...

• Table schema

  CREATE TABLE task
  (
  id          int          NOT NULL AUTO_INCREMENT,
  owner       binary(16)   NOT NULL,
  
  PRIMARY KEY (id),
  FOREIGN KEY (owner) REFERENCES user (id)
  );

• Entity class

  @Data
  @Table("task")
  public class TaskEntity {
  
  @Id
  private Integer id;
  
  private AggregateReference<UserEntity, UUID> owner;
  }

• Custom converter

  @Component
  public class UuidFromBin implements Converter<byte[], UUID> {
  
  @Override
  public UUID convert(byte[] source) {
  ByteBuffer byteBuffer = ByteBuffer.wrap(source);
  long high = byteBuffer.getLong();
  long low = byteBuffer.getLong();
  return new UUID(high, low);
  }
  }

This should convert value of the binary id column into UUID id field of TaskEntity when the table is read, but the following exception is thrown.

org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.Byte] to type [org.springframework.data.jdbc.core.mapping.AggregateReference<jp.co.sre.aip.samplebasic.core.app.repository.UserEntity, java.util.UUID>] for value [-121]
    at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:47)
    at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:182)
    at org.springframework.core.convert.support.ArrayToObjectConverter.convert(ArrayToObjectConverter.java:68)
    at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:41)
    at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:182)

...

Caused by: org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [java.lang.Byte] to type [java.util.UUID]

    at org.springframework.core.convert.support.GenericConversionService.handleConverterNotFound(GenericConversionService.java:294)
    at org.springframework.core.convert.support.GenericConversionService.convert(GenericConversionService.java:185)
    at org.springframework.data.jdbc.core.convert.AggregateReferenceConverters$SimpleTypeToAggregateReferenceConverter.convert(AggregateReferenceConverters.java:131)
    at org.springframework.core.convert.support.ConversionUtils.invokeConverter(ConversionUtils.java:41)

[mp911de]

Can you provide a minimal yet complete sample that reproduces the problem? You can share it with us by pushing it to a separate repository on GitHub or by zipping it up and attaching it to this issue.

[kota65535]

@mp911de Sure, here it is.