Spring JPA Repository - Operator SIMPLE_PROPERTY on jsonObject requires a scalar argument

I encountered this same problem. I worked around it by changing the name of my method by adding "In" to the end of it.

For your example, it would be

findAllByTagsIn(java.util.Set)

See the "supported keywords inside method names" table here: https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#jpa.query-methods.query-creation