java - 我的项目中缺少什么注释？

Question

我读过类似的问题，但找不到解决方案。

我正在使用 Vaadin 和 Spring Boot。我之前有一个项目运行良好，没有收到此白标签消息，并且我使用相同的注释和所有内容。在入口点 Spring Boot 类中，我定义了 @SpringBootApplication。

“此应用程序没有/error 的显式映射，因此您将其视为后备。

2019 年欧洲中部时间 12 月 28 日星期六 18:56:32出现意外错误(类型=未找到，状态=404)。无可用消息”

同时我认为问题出在我的 POM 上。

感谢您的帮助，以免下次再犯同样的问题。

我的服务类别:

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Component;


@Component
public class PersonService {

    @Autowired
    private JdbcTemplate JdbcTemplate;

    public List<Person>

            findAll() {
                return JdbcTemplate.query(
                        "SELECT Név, Mérkőzések_száma, Győzelmek_száma, Vereségek_száma FROM Darts",
                        (rs, rowNum) -> new Person(rs.getString("nev"), 
                        rs.getInt("games"), rs.getInt("wins"), rs.getInt("loses")));
            }
            public void update(Person person) {
                JdbcTemplate.update(
                        "UPDATE Darts SET Mérkőzések_száma=?, Győzelmek_száma=?, Vereségek_száma=? WHERE Név=?)",
                        person.getGames(), person.getWins(), person.getLoses(), person.getName());
            }

}

我的人物类:

public class Person {

    private String name;
    private int games;
    private int wins;
    private int loses;

    public Person(String name, int games, int wins, int loses) {
        this.name = name;
        this.games = games;
        this.wins = wins;
        this.loses = loses;
    }

    public int getLoses() {
        return loses;
    }

    public void setLoses(int loses) {
        this.loses = loses;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getGames() {
        return games;
    }

    public void setGames(int games) {
        this.games = games;
    }

    public int getWins() {
        return wins;
    }

    public void setWins(int wins) {
        this.wins = wins;
    }



}

我的 MainView 类:

import com.vaadin.data.Binder;
import com.vaadin.flow.router.Route;
import com.vaadin.server.VaadinRequest;
import com.vaadin.ui.*;
import com.vaadin.spring.annotation.SpringUI;
import org.springframework.beans.factory.annotation.Autowired;


@SpringUI
public class MainView extends UI {

    @Autowired
    private PersonService service;

    private TextField name = new TextField("Name");
    private TextField games = new TextField("Game");
    private TextField wins = new TextField("Win");
    private TextField loses = new TextField("Lose");

    private Person person;

    private final Binder<Person> bind = new Binder<>(Person.class);
    private final Grid<Person> grid = new Grid<>(Person.class);



    @Override
    protected void init(VaadinRequest request) {

        grid.setColumns("name", "games", "wins", "loses");

        VerticalLayout layout = new VerticalLayout(grid, name, games, wins, loses);

        setContent(layout);


}
}

POM:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.benjaminhalasz</groupId>
    <artifactId>darts</artifactId>
    <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
    <name>darts</name>
    <description>Demo project for Spring Boot</description>

    <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <vaadin.version>14.1.3</vaadin.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
     <dependency>
      <groupId>com.vaadin</groupId>
      <artifactId>vaadin-spring</artifactId>
      <version>3.0.1</version>
      <type>jar</type>
     </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.vaadin</groupId>
                <artifactId>vaadin-bom</artifactId>
                <version>${vaadin.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

编辑:应用程序属性:

spring.datasource.url=jdbc:mysql://localhost/vizsgadb_HB
spring.datasource.username=vizsgauser_HB
spring.datasource.password=12345678
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

Answer 1

经过一番研究，似乎:

• 在您的 POM 中，您应该删除依赖项 vaadin-spring。它与 vaadin-spring-boot-starter 导入的版本不同。使用启动器时，尝试仅使用启动器，不要使用其他东西。它们旨在承载您需要的所有依赖项。
• 您应该将@SpringUI替换为@Route。欲了解更多信息，请查看:https://www.baeldung.com/spring-boot-vaadin

请告诉我这是否有效。