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請我錯了什麼，我該怎麼辦？org.hibernate.TransientPropertyValueException
我有編譯過程中org.hibernate.TransientPropertyValueException exeption當我嘗試將對象插入我的數據庫：
主類
public class Main {
public static void main(String[] args) {
SessionFactory sessionFactory = new HibernateUtil().getSessionFactory();
Session session = sessionFactory.openSession();
session.beginTransaction();
Role role = new Role();
role.setTitle("ex-president");
User user1 = new User(100,"Barack","Obama");
User user2 = new User(100,"Ronald","Reagan");
user1.setRole(role);
user2.setRole(role);
session.save(user1);
session.save(user2);
role.getUsers().add(user1);
role.getUsers().add(user2);
session.save(role);
session.getTransaction().commit();
session.close();
}}
HibernateUtil類
public class HibernateUtil {
private static SessionFactory sessionFactory;
static {
Configuration configuration = new Configuration();
configuration.configure("hibernate.cfg.xml");
StandardServiceRegistryBuilder ssrb = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties());
sessionFactory = configuration.buildSessionFactory(ssrb.build());
}
public SessionFactory getSessionFactory(){
return sessionFactory;
}}
角色類
@Entity
public class Role {
private Long role_id;
private String title;
private Set<User> users = new HashSet<User>();
public Role(){}
public Set<User> getUsers() {
return users;
}
public void addUser(User user){
users.add(user);
}
public void setUsers(Set<User> users) {
this.users = users;
}
public Long getRole_id() {
return role_id;
}
public void setRole_id(Long id) {
this.role_id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}}
User類
@Entity
public class User {
private long user_id;
private int age;
private String firstname;
private String lastname;
private Role role;
public User(){
}
public Role getRole() {
return role;
}
public void setRole(Role role) {
this.role = role;
}
public User(int age, String firstname, String lastname) {
this.age = age;
this.firstname = firstname;
this.lastname = lastname;
}
public long getUser_id() {
return user_id;
}
public void setUser_id(long id) {
this.user_id = id;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getFirstname() {
return firstname;
}
public void setFirstname(String firstname) {
this.firstname = firstname;
}
public String getLastname() {
return lastname;
}
public void setLastname(String lastname) {
this.lastname = lastname;
}}
的hibernate.cfg.xml
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>
<property name="connection.username">root</property>
<property name="connection.password">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hbm2ddl.auto">create</property>
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<mapping resource="user.cfg.xml"/>
<mapping resource="role.cfg.xml"/>
</session-factory>
</hibernate-configuration>
role.cfg.xml
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="Role" table="role">
<id name="role_id" column="id">
<generator class="native"/>
</id>
<property name="title" column="TITLE"/>
<set name="users" cascade="all"
inverse="true" lazy="true" fetch="select">
<key column="id" not-null="true"/>
<one-to-many class="User"/>
</set>
</class>
</hibernate-mapping>
user.cfg.xml
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="User" table="user">
<id name="user_id" column="user_id">
<generator class="native"/>
</id>
<property name="firstname" column="firstname"/>
<property name="lastname" column="lastname"/>
<property name="age" column="age"/>
<many-to-one name="role" class="Role" fetch="select">
<column name="id" not-null="true"/>
</many-to-one>
</class>
</hibernate-mapping>
在日誌中的錯誤信息： 