今天在开发JPA项目的时候,插入一个新的商家出现了一个奇怪的问题。
第一次插入的时候正常,然后再点击一次,插入同样的数据竟然报错:
Null or zero primary key encountered in unit of work clone exception not working
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="agency">
<class>model.Address</class>
<class>model.Order</class>
<class>model.Seller</class>
<class>model.Service</class>
<class>model.User</class>
<properties>
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://192.168.100.1:3306/agency?characterEncoding=UTF-8"/>
<property name="javax.persistence.jdbc.user" value="root"/>
<property name="javax.persistence.jdbc.password" value="root"/>
<property name="eclipselink.allow-zero-id" value="true"/>
</properties>
</persistence-unit>
</persistence>