Closed
Description
Assume following interface:
interface ProjectionObject {
CustomTypeObject getCustomType();
}and use case:
var projection = this.repository.findMyProjectionObject();
projection.getCustomType() // 2.2.10 OK, 2.4.2+ does not workConverter:
@Converter
public class CustomTypeObjectConverter implements javax.persistence.AttributeConverter<CustomTypeObject, String> {
@Override
public String convertToDatabaseColumn(final CustomTypeObject attribute) {
return attribute == null ? null : attribute.get();
}
@Override
public CustomTypeObject convertToEntityAttribute(final String dbData) {
return new CustomTypeObject(dbData);
}
}Repository:
interface CustomObjectRepository extends JpaRepository<CustomObjectEntity, Long> {
@Query(value = "SELECT FIRST 1 'data' as customType FROM systables", nativeQuery = true)
CustomObjectType findMyProjectionObject();
}Entity
@Entity
@Table(name = "systables")
class CustomObjectEntity {
@Column(name = "tabname")
@Convert(converter = CustomTypeObjectConverter.class)
private CustomTypeObject code;
public CustomTypeObject getCustomType() {
return this.code;
}
}With defined javax.persistence.AttributeConverter<CustomTypeObject, String> in Spring 2.2.10 return value was converted without problem.
In spring Boot 2.4.2 and 2.4.3 conversion throws:
java.lang.IllegalArgumentException: Projection type must be an interface!
at org.springframework.util.Assert.isTrue(Assert.java:121)
at org.springframework.data.projection.ProxyProjectionFactory.createProjection(ProxyProjectionFactory.java:108)
at org.springframework.data.projection.SpelAwareProxyProjectionFactory.createProjection(SpelAwareProxyProjectionFactory.java:45)
at org.springframework.data.projection.ProjectingMethodInterceptor.getProjection(ProjectingMethodInterceptor.java:160)
at org.springframework.data.projection.ProjectingMethodInterceptor.potentiallyConvertResult(ProjectingMethodInterceptor.java:108)
at org.springframework.data.projection.ProjectingMethodInterceptor.invoke(ProjectingMethodInterceptor.java:85)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.projection.ProxyProjectionFactory$TargetAwareMethodInterceptor.invoke(ProxyProjectionFactory.java:253)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:80)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:215)
Issue is related to #1798 and spring-projects/spring-data-commons#2260.
Caused probably by spring-projects/spring-data-commons#459 when Object to Object mapping has been removed.
CONVERSION_SERVICE.removeConvertible(Object.class, Object.class);