Spring Cache with Spring Data Rest Repository is caching results of save on exception - spring

Question

I have a Spring Data Rest repository that I would like to use Spring Caching with it.
The cache works as expected when there are no errors. However, when the result of the save is a validation exception, the entity is cached, even though it is not written to the database.
SDR Repository
#RepositoryRestResource(collectionResourceRel = "businessUnits", path = "businessUnits")
public interface BusinessUnitRepository extends JpaRepository<BusinessUnit, UUID> {
#Override
#Cacheable(value = "lookups", cacheManager = "vaultCache")
BusinessUnit findOne(final UUID id);
#Override
#CacheEvict(value = "lookups", cacheManager = "vaultCache", allEntries = true, beforeInvocation = true)
BusinessUnit save(BusinessUnit entity);
If I POST the message body below a new Business Unit it is saved correctly. The first GET to retrieve the record hits the database as expected and subsequent GETs come from the cache.
{
"name": "Test_Business_2",
"effectiveDate": "2019-12-16T11:11:11.111+0000",
"expirationDate": "2020-12-16T11:11:11.111+0000",
"businessUnitType": "/businessUnitTypes/38faf33c-5454-4245-bc69-2b31e510fa6b"
}
The BusinessUnit Entity has a not null on the effectiveDate field.
#NotNull
#Column(name = "effective_date")
private Timestamp effectiveDate;
When I PATCH the business unit with a null effectiveDate. The response is an error, an exception is logged and the database is not updated.
{
"effectiveDate": null
}
When I query the db, I see the record was not updated
NAME EFFECTIVE_DATE EXPIRATION_DATE
Test_Business_2,2019-12-16 06:11:11,2020-12-16 06:11:11
However, when I do a GET on the businessUnits endpoint. The database is not hit to read the record, and the null effectiveDate is returned.
{
"createDate": "2017-02-20T13:38:00.386+0000",
"lastModifiedDate": "2017-02-20T13:38:00.386+0000",
"effectiveDate": null,
"expirationDate": "2020-12-16T11:11:11.111+0000",
"name": "Test_Business_2", ...
So, it seems the data that caused the exception to be thrown, is stored in cache.
What do I need to change so that the value is not saved in cache when the database is not updated on save?
I appreciate any help or advice. Thanks.

Answer 1

The key you cache and the key you evict don't match. You need to define how to get the id from the BusinessUnit, for example:
#CacheEvict(key = "#entity.id"
Or provide a KeyGenerator that understands your domain model.