JP ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5ebc14d... ) *commented* on HHH-13503 ( https://hibernate.atlassian.net/browse/HHH-13503?atlOrigin=eyJpIjoiMThjZD... ) Re: EhCache Java11 ( https://hibernate.atlassian.net/browse/HHH-13503?atlOrigin=eyJpIjoiMThjZD... ) I have encountered the same issue using java 8, hibernate 5.4.15 and EhCache 3.8.1 as a second level cache. I've tracked it down by activating the sun.io.serialization.extendedDebugInfo property, which gives the SerializationTrace.txt ( https://hibernate.atlassian.net/secure/attachment/49683/49683_Serializati... ) attached In short, here's what I found: * The result query cache doesn't work with queries using named parameters on fields which are typed using a javax.persistence.Convert converter * This is because the the resolved type which is stored inside org.hibernate.cache.spi.QueryKey is an instance of org.hibernate.type.descriptor.converter.AttributeConverterSqlTypeDescriptorAdapter which is not serializable. * When the key is then stored inside EhCache, it throws the NotSerializableException I'm reasonably certain that this is not a regression, but something that surfaced when moving to EhCache 3 (never had any issues with EhCache 2) What I do for now is to disable the result cache for these queries, but I have no real solutions. Any ideas? ( https://hibernate.atlassian.net/browse/HHH-13503#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-13503#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#100126- sha1:dd08494 )