How do I use JPA's #EmbeddedId with #Query and no #Table? - jpa

Question

I have a the following...
#Query(
value="SELECT MAX(LOG_DATE) AS LOG_DATE, REGION_NAME, HOST_NAME, MIN(REGION_MIN_TIME) AS REGION_MIN_TIME, MAX(REGION_MAX_TIME) AS REGION_MAX_TIME,SUM(TOTAL_TIME_TAKEN) AS TOTAL_TIME_TAKEN, SUM(REGION_API_COUNT) AS REGION_API_COUNT,AVG(TOTAL_TIME_TAKEN/REGION_API_COUNT) AS AVG_RES_TIME, MAX(LST_SRC_UPDT_DATE) AS LST_SRC_UPDT_DATE FROM MY_SCHEMA.GEMFIRE_REGION_USAGE GROUP BY REGION_NAME,HOST_NAME",
nativeQuery = true
)
List<GemfireStatAggregate> findAggregates();
#Getter
#AllArgsConstructor
#NoArgsConstructor
#Entity
public class GemfireStatAggregate {
#EmbeddedId
private GemfireStatId id;
#Column(name="REGION_MIN_TIME")
private String regionMinTime;
}
#Embeddable
#Getter
#AllArgsConstructor
#NoArgsConstructor
public class GemfireStatId implements Serializable {
#Column(name = "LOG_DATE")
private Date loggedDate;
#Column(name="REGION_NAME")
private String regionName;
#Column(name="HOST_NAME")
private String hostName;
}
But when I run I get the following...
Failed to convert from type [java.lang.Object[]] to type [com.me.GemfireStatAggregate] for value '{...data redacted but looks good...}'; nested exception is org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [java.sql.Timestamp] to type [com.me.GemfireStatAggregate]
Why is this happening?
Update
This does work but is ugly and I don't like it...
public List<GemfireStatAggregate> getAggregateData() {
List<GemfireStatAggregate> result = new ArrayList<>();
for(Object[] arr : repo.findAggregates()){
GemfireStatId id = new GemfireStatId(
(Timestamp) Array.get(arr, 0),
(String) Array.get(arr, 1),
(String) Array.get(arr, 2)
);
result.add(new GemfireStatAggregate(
id,
(String) Array.get(arr, 3)
));
}
return result;
}

Answer 1

add #Temporal annotation on your loggedDate field
#Temporal(TemporalType.DATE)
#Column(name = "LOG_DATE")
private Date loggedDate;