By referring to

https://stackoverflow.com/questions/49550174/spring-boot-2-and-redshift-connectivity/50483706

we may set property

spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation = true.

Disabling contextual LOB creation as hibernate.jdbc.lob.non_contextual_creation is trueThat is much cleaner.

Still pursue good support for Redshift.