src/main/resources/META-INF/persistence.xml

<persistence 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_2.xsd"
             version="2.2">

    <persistence-unit name="myPersistenceUnit">
        <!-- 指定 JPA 提供者 -->
        <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>

        <!-- 仅保留 UserPT 实体，避免其它实体的 @MapsId 映射错误 -->
        <!-- 全限定名，确保 JPA 真正注册到 EMF -->
        <class>object.UserPT</class>
        <class>object.Seed</class>
        <class>object.User</class>
        <class>object.Notice</class>
        <class>object.BegInfo</class>
        <class>object.Post</class>
        <class>object.Profile</class>
       

        <!-- 数据库连接配置 -->
        <properties>
            <property name="javax.persistence.jdbc.url" value="${DB_URL}"/>
            <property name="javax.persistence.jdbc.user" value="${DB_USER}"/>
            <property name="javax.persistence.jdbc.password" value="${DB_PASSWORD}"/>
            <property name="javax.persistence.jdbc.driver" value="com.mysql.cj.jdbc.Driver"/>

            <!-- Hibernate 配置 -->
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"/>
            <property name="hibernate.hbm2ddl.auto" value="update"/>
            <property name="hibernate.show_sql" value="true"/>
        </properties>
    </persistence-unit>

</persistence>