Thanks Rick for your responding, do you mean there is any configuration in
persistence.xml?
My file is very simple:

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence";
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
             version="1.0">
    <persistence-unit name="PersistenceUnit">
       
<provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>

       
        <class>model.Message</class>

        <properties>
            <property name="openjpa.Log" value="DefaultLevel=TRACE"/>
            <!--<property name="openjpa.log" value="DefaultLevel=WARN,
Runtime=INFO, Tool=INFO"/>-->
        </properties>
    </persistence-unit>
</persistence>
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