java - Spring 找不到要 Autowiring 的服务或存储库 bean

Question

我正在尝试使用 Swing 尽可能基本地使用 Spring 数据运行 Spring Boot。

但是，即使所有似乎都已正确配置，当我尝试运行它时，我收到一条错误消息，指出它找不到我的 Service bean。

package db.westworld.dao;

import db.westworld.entities.RobotEntity;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface RobotRepository extends CrudRepository<RobotEntity, Integer> {
}

package db.westworld.service;

import db.westworld.entities.RobotEntity;

import java.util.Optional;

public interface IRobotService {
    Optional<RobotEntity> findById(int id);
}

package db.westworld.service;

import db.westworld.dao.RobotRepository;
import db.westworld.entities.RobotEntity;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.Optional;

@Service
public class RobotService implements IRobotService {

    private final RobotRepository robotRepository;

    @Autowired
    RobotService(RobotRepository robotRepository) {
        this.robotRepository = robotRepository;
    }

    @Override
    public Optional<RobotEntity> findById(int id) {
        return robotRepository.findById(id);
    }

    public void saveRobot(RobotEntity robot) {
        robotRepository.save(robot);
    }
}

package db.westworld;

import db.westworld.view.RegisterRobot;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;

import java.awt.*;

@SpringBootApplication
public class WestworldApplication {

    public static void main(String[] args) {
        var ctx = new SpringApplicationBuilder(RegisterRobot.class).headless(false).run(args);
        EventQueue.invokeLater(() -> {
            var ex = ctx.getBean(RegisterRobot.class);
            ex.setVisible(true);
        });
    }
}

package db.westworld.view;

import db.westworld.entities.RobotEntity;
import db.westworld.service.RobotService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

import javax.swing.*;
import java.awt.event.*;
import java.util.Date;

@Controller
public class RegisterRobot extends JDialog {
private RobotService robotService;

    @Autowired
    public void setRobotService (RobotService robotService) {
        this.robotService = robotService;
    }
    private void onOK() {
        RobotEntity robot = new RobotEntity();
        robot.setCreatedAt(new Date());
        robot.setId(1);
        robotService.saveRobot(robot);
        dispose();
    }
}

错误消息:

Parameter 0 of method setRobotService in db.westworld.view.RegisterRobot required a bean of type 'db.westworld.service.RobotService' that could not be found.


Action:

Consider defining a bean of type 'db.westworld.service.RobotService' in your configuration.

(JDialog 实现仅包含基础知识)

当我尝试自动连接存储库时也会发生同样的情况。另外，如果需要，这是我的 pom.xml

<?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>2.2.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>    <groupId>db</groupId>
    <artifactId>westworld</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>westworld</name>
    <description>westworldSpringBoot</description>

    <properties>
        <java.version>11</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </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>javax.inject</groupId>
            <artifactId>javax.inject</artifactId>
            <version>1</version>
        </dependency>
    </dependencies>

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

</project>

Answer 1

new SpringApplicationBuilder() 的参数必须是用 @SpringBootApplication 注释的类，如我见过的每个 Spring Boot 示例所示，例如Create an Application class在“入门 - 使用 Spring Boot 构建应用程序”指南中。