Mike Zhao ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *updated* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiNmI1YzNhMzcx... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-16684?atlOrigin=eyJpIjoiNmI1Yz... ) HHH-16684 ( https://hibernate.atlassian.net/browse/HHH-16684?atlOrigin=eyJpIjoiNmI1Yz... ) Query cache with entity having enum and custom converter throws SerializerException ( https://hibernate.atlassian.net/browse/HHH-16684?atlOrigin=eyJpIjoiNmI1Yz... ) Change By: Mike Zhao ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) Caching query results in a spring JPA repository using query-hint, hibernate throws SerializerException when the entity involved has Enum field and a customer converter. In org {code:java}java. hibernate io. cache.spi.QueryKey there is a field NotSerializableException: org.hibernate. transform metamodel. CacheableResultTransformer which is not transient model. It seems like this field is causing the exception convert. internal.JpaAttributeConverterImpl{code} ehcach.xml (note that there are far less entries than 1000 as configured) {code:xml}<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.ehcache.org/v3" xmlns:jsr107="http://www.ehcache.org/v3/jsr107" xsi:schemaLocation=" http://www.ehcache.org/v3 http://www.ehcache.org/schema/ehcache-core-3.0.xsd http://www.ehcache.org/v3/jsr107 http://www.ehcache.org/schema/ehcache-107-ext-3.0.xsd"> <service> <jsr107:defaults enable-management="true" enable-statistics="true"/> </service> <!-- cache eternal unless updated, i.e. no TTL from cache manager itself --> <cache-template name="simple"> <expiry> <none/> </expiry> <heap unit="entries">1000</heap> </cache-template> <cache alias="org.hibernate.cache.internal.StandardQueryCache" uses-template="simple"/> <cache alias="org.hibernate.cache.spi.TimestampsCache" uses-template="simple"/> </config>{code} ( https://hibernate.atlassian.net/browse/HHH-16684#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16684#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100225- sha1:2b972a1 )