ORG.HIBERNATE.HQL.AST.QUERYSYNTAXEXCEPTION:XXX is isn't mapped [from xxx]

XXX is not mapped[from xxx]
In the use of hibernate, there are often small errors, such as the following error tip:
Org.hibernate.hql.ast.QuerySyntaxException:student is isn't mapped [from student],
Meaning is not mapped to student this class, then what to do?

The query statement in Hibernate is case-sensitive, and you see this is the statement I wrote:
Session session = Hibernatesessionfactory.getsession ()//Get Session Object
Query query = Session.createquery ("from student");
list<data> list = Query.list ();
Session.createquery ("from student"); the "from student" in is not mapped to an entity class.
It's not quite the same as using SQL directly, because my Student class is Student.java
Accordingly, change from student to from student (note uppercase) so that hibernate can find the entity class.