Assume simple entity with cName field declared as java.lang.Character and now you want to do the query

	Query query = entityManager.createQuery("UPDATE EntityC c SET c.cName='J'");
	query.executeUpdate();

it gives you the exception

java.lang.IllegalArgumentException: org.hibernate.query.SemanticException: The assignment expression type [java.lang.String] did not match the assignment path type [java.lang.Character] for the path [c.cName] [UPDATE EntityC c SET c.cName='J']