When executing this query: > select r from Registrant r where r.membershipId = :membershipId I get the following message: org.hibernate.hql.ast.QuerySyntaxException: Registrant is not mapped [select r from Registrant r where r.membershipId = :membershipId] However, the class is mapped, and the class is visible in the ER diagram. I just cannot execute queries from within IntelliJ. Normal application works fine.