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Hibernate: select nextval ('hibernate_sequence')
Hibernate: insert into message (tag, text, id) values (?, ?, ?)
Hibernate: select message0_.id as id1_0_, message0_.tag as tag2_0_, message0_.text as text3_0_ from message message0_

spring.jpa.hibernate.ddl-auto=update
spring.jpa.generate-ddl=true
spring.jpa.database-platform=org.hibernate.dialect.PostgreSQL94Dialect

spring.datasource.driverClassName=org.postgresql.Driver
spring.datasource.url=jdbc:postgresql://localhost:5432/message
spring.datasource.username=postgres
spring.datasource.pasword=root

spring.mustache.expose-request-attributes=true
spring.jpa.show-sql=true
spring.session.store-type=none

<html>
    <body>
        <div>
            <form action="/logout" method="post">
                <input type="hidden" name="_csrf" value="{{_csrf.token}}"/>
                <input type="submit" value="Sign Out"/>
            </form>
        </div>
        <div>
            <form method="post">
                <input type="text" name="text" placeholder="Введіть повідомлення" />
                <input type="text" name="tag" placeholder="tag" />
                <input type="hidden" name="_csrf" value="{{_csrf.token}}"/>
                <button type="submit">Добавити</button>

            </form>
        </div>
        <div>Список повідомлень</div>
        {{#messeges}}
        <div>
            <b>{{id}}</b>
            <span>{{text}}</span>
            <i>{{tag}}</i>
        </div>
        {{/messeges}}
    </body>
</html>

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity
public class Message {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Integer id;

    private String text;
    private String tag;

    public Message() {
    }

    public Message(String text, String tag) {
        this.text = text;
        this.tag = tag;
    }

    public void setText(String text) {
        this.text = text;
    }

    public String getText() {
        return text;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getTag() {
        return tag;
    }

    public void setTag(String tag) {
        this.tag = tag;
    }
}

@Autowired
    private MessageRepo messageRepo;

    @GetMapping("/")
    public String greeting( Map<String, Object> model) {


        return "greeting";
    }

    @GetMapping("/main")
    public String main(Map<String, Object> model) {
        Iterable<Message> messages = messageRepo.findAll();

        model.put("messages", messages);

        return "main";
    }

    @PostMapping("/main")
    public String add(@RequestParam String text,
                      @RequestParam String tag, Map<String, Object> model) {

        Message message = new Message(text, tag);
        messageRepo.save(message);

        Iterable<Message> messages = messageRepo.findAll();

        model.put("messages", messages);

        return "main";
    }