{
  "user": {
    "id": "F3S3I-A3li3",
    "age": "205",
    "comment": "Hello I am a random string"
  }
}

public void addToDatabae(String content){
    JSONObject  = new JSONObject(content);
    User u = new User();
    u.setJavaID(newUserJSON.getJSONObject("user").getInt("id"));
    u.setName(newUserJSON.getJSONObject("user").getString("age"));
    u.setAge(newUserJSON.getJSONObject("user").getInt("comment"));
    enter code here

    EntityManagerFactory emf = Persistence.createEntityManagerFactory("pu");
    EntityManager em = emf.createEntityManager();

    em.getTransaction().begin();
    em.persist(u);
    em.getTransaction.commit();

}

<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="pu">
        <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
        <properties>
            <property name="openjpa.ConnectionURL" value="jdbc:mysql://localhost:3306/tableEntries?useUnicode=true&amp;useJDBCCompliantTimezoneShift=true&amp;useLegacyDatetimeCode=false&amp;serverTimezone=UTC"/>
            <property name="openjpa.ConnectionDriverName" value="com.mysql.jdbc.Driver"/>
            <property name="openjpa.ConnectionUserName" value="root"/>
            <property name="openjpa.ConnectionPassword" value="secret"/>
            </properties>
    </persistence-unit>
</persistence>