我正在向城市插入hv多对一映射的用户。然后城市hv manytone映射到国家。因此，当我插入具有重复城市或国家/地区的用户时，它会抛出异常。
@Entity
@Table(name = "users")
@XmlRootElement
public class User implements java.io.Serializable {
/**
*
*/
private static final long serialVersionUID = -2095697913583686677L;
private String firstname;
private String lastname;
private String dob;
private long mobile;
private String email;
@ManyToOne
@Cascade(CascadeType.SAVE_UPDATE)
@JoinColumn(name = "city_name", nullable = false)
private City city;
private String country;
private String password;
private Date createdTime;
private Date lastLoggedIn;
private int rating;
@Id
private int id;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
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;
}
public String getDob() {
return dob;
}
public void setDob(String dob) {
this.dob = dob;
}
public long getMobile() {
return mobile;
}
public void setMobile(long mobile) {
this.mobile = mobile;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public City getCity() {
return city;
}
public void setCity(City city) {
this.city = city;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Date getCreatedTime() {
return createdTime;
}
public void setCreatedTime(Date createdTime) {
this.createdTime = createdTime;
}
public Date getLastLoggedIn() {
return lastLoggedIn;
}
public void setLastLoggedIn(Date lastLoggedIn) {
this.lastLoggedIn = lastLoggedIn;
}
public int getRating() {
return rating;
}
public void setRating(int rating) {
this.rating = rating;
}
public String toString() {
return "Name = " + firstname + ",Mobile = " + mobile + ",Email = "
+ email + ",City = " + city + ",Country = " + country
+ ", TimeCreated = " + createdTime;
}
}
@Entity
@Table(name = "city")
public class City {
@Id
@GeneratedValue
private int id;
@Column(name = "city_name", unique = true, nullable = false, length = 40)
private String cityName;
@ManyToOne
@Cascade(CascadeType.SAVE_UPDATE)
@JoinColumn(name = "country_name", nullable = false)
private Country countryName;
@OneToMany
@Cascade(CascadeType.SAVE_UPDATE)
@JoinColumn(name = "city_name")
private List<User> users;
public List<User> getStockDailyRecords() {
return this.users;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getCityName() {
return cityName;
}
public void setCityName(String cityName) {
this.cityName = cityName;
}
public Country getCountryName() {
return countryName;
}
public void setCountryName(Country countryName) {
this.countryName = countryName;
}
public List<User> getUsers() {
return users;
}
public void setUsers(List<User> users) {
this.users = users;
}
}
@Entity
@Table(name = "country")
public class Country {
@Id
@GeneratedValue
private int id;
@Column(name = "country_name", unique = true, nullable = false, length = 40)
private String countryName;
@OneToMany
@JoinColumn(name = "country_name")
private List<City> citys;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getCountryName() {
return countryName;
}
public void setCountryName(String countryName) {
this.countryName = countryName;
}
public List<City> getCitys() {
return citys;
}
public void setCitys(List<City> citys) {
this.citys = citys;
}
}
Hibernate Request processing failed; nested exception is org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing: com.shubh.model.User.city -> com.shubh.model.City; nested exception is java.lang.IllegalStateException: org.hibernate.TransientPropertyValueException: object references an unsaved transient instance - save the transient instance before flushing
弹簧配置： -
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:jpa="http://www.springframework.org/schema/data/jpa"
xsi:schemaLocation="
http://www.springframework.org/schema/data/jpa
http://www.springframework.org/schema/data/jpa/spring-jpa.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">
<context:component-scan base-package="com.shubh" />
<mvc:annotation-driven />
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/pages/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
<!-- <bean id="mysqldataSource" class="com.mysql.jdbc.jdbc2.optional.MysqlDataSource"> -->
<!-- <property name="url" value="jdbc:mysql://localhost:3306/apu"></property> -->
<!-- <property name="user" value="root"></property> -->
<!-- <property name="password" value="admin"></property> -->
<!-- </bean> -->
<bean id="myEmf" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan" value="com.shubh.model" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
</property>
<property name="jpaProperties">
<props>
<prop key="hibernate.hbm2ddl.auto">update</prop>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
</props>
</property>
</bean>
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/apu" />
<property name="username" value="root" />
<property name="password" value="admin" />
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="myEmf" />
</bean>
<tx:annotation-driven />
<bean id="persistenceExceptionTranslationPostProcessor"
class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" />
<jpa:repositories base-package="com.shubh.repository"/>
</beans>
答案 0 :(得分：0)
我没有看到保存对象的代码..但是从异常堆栈中我可以看到你在保存城市之前试图保存人。
答案 1 :(得分：0)
这是错误org.hibernate.TransientPropertyValueException: object references an unsaved transient.
当你试图坚持父对象并且你的孩子不是持久存在时，它会出现，所以在你的情况下，请保存第一个国家，城市，然后将其设置为用户对象，然后保存用户对象。
在hibernate中保存对象有多种方法取决于您使用的
saveOrUpdate();
update();
save();
persist();
merge();