首先，写一个servlet：public class EventManagerServlet extends HttpServlet { protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

oracle.jdbc.driver.OracleDriver jdbc:oracle:thin:@127.0.0.1:1521:orcl cjq cjq 1 org.hibernate.dialect.OracleDialect

首先是Event类， public class Event { private int id; private String title; private Date date; private Set participants = new HashSet(); public Event() {}

====1===org.hibernate.MappingException: Unknown entity: cjq.hibernate.tutorial.domain.Event at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:1192) at org.h

package eg;import java.util.Set;public class Parent { private long id; private Set children; public long getId() { return id; } private void setId(long id) { this.id=id; }

cjq\hibernate\tutorial\domain01\Person.hbm.xml文件内容为：        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">