redbbs-pro/conf/persistence.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
    
    <persistence-unit name="redbbs" transaction-type="RESOURCE_LOCAL">
        <shared-cache-mode>ALL</shared-cache-mode>
        <properties>
            <property name="javax.persistence.jdbc.url" value="jdbc:mysql://mysqlhost:3306/?autoReconnect=true&amp;characterEncoding=utf8"/>
            <property name="javax.persistence.jdbc.driver" value="com.mysql.cj.jdbc.Driver"/>
            <property name="javax.persistence.jdbc.user" value="guest"/>
            <property name="javax.persistence.jdbc.password" value="hello"/>
        </properties>
    </persistence-unit>
    
</persistence>