Java Spring 构造函数的引导参数0为必填项

Question

我正在学习 Spring Boot 并且收到以下错误消息：

com.example.demo.appuser.AppUserService 中构造函数的参数 0 需要找不到类型为“com.example.demo.appuser.AppUserRepository”的 bean。

这是我的 AppUserService

package com.example.demo.appuser;

import lombok.AllArgsConstructor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Service;

@Service
@AllArgsConstructor
public class AppUserService implements UserDetailsService {

    private final static String USER_NOT_FOUND_MSG =
            "user with email %s not found";

    @Autowired
    private AppUserRepository appUserRepository;


    @Override
    public UserDetails loadUserByUsername(String email)
            throws UsernameNotFoundException {
        return appUserRepository.findByEmail(email)
                .orElseThrow(() ->
                        new UsernameNotFoundException(
                                String.format(USER_NOT_FOUND_MSG, email)));
    }
}

这是我的 AppUserRepository

package com.example.demo.appuser;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

import java.util.Optional;

@Repository
@Transactional(readOnly = true)
public interface AppUserRepository
        extends JpaRepository<AppUser, Long> {

    Optional<AppUser> findByEmail(String email);
}

更新，这是我的配置文件

package com.example.demo.security.config;

import com.example.demo.appuser.AppUserService;
import lombok.AllArgsConstructor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.security.authentication.dao.DaoAuthenticationProvider;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;

@Configuration
@AllArgsConstructor
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    private final AppUserService appUserService;
    private final BCryptPasswordEncoder bCryptPasswordEncoder;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
                .csrf().disable()
                .authorizeRequests()
                    .antMatchers("/api/v*/registration/**")
                    .permitAll()
                .anyRequest()
                .authenticated().and()
                .formLogin();
    }

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth.authenticationProvider(daoAuthenticationProvider());
    }

    @Bean
    public DaoAuthenticationProvider daoAuthenticationProvider(){
        DaoAuthenticationProvider provider = new DaoAuthenticationProvider();

        provider.setPasswordEncoder(bCryptPasswordEncoder);
        provider.setUserDetailsService(appUserService);
        return  provider;
    }
}

更新 2 我的堆栈跟踪

***************************
APPLICATION FAILED TO START
***************************

Description:

Parameter 0 of constructor in com.example.demo.appuser.AppUserService required a bean named 'entityManagerFactory' that could not be found.


Action:

Consider defining a bean named 'entityManagerFactory' in your configuration.


Process finished with exit code 1

这就是我所得到的

更新 3：链接到我的 package 结构： https://imgur.com/gallery/fD1PZgU

更新 4 演示应用：

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;

@SpringBootApplication(scanBasePackages = "com.example")
@EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})
public class DemoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }

}

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>2.5.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>16</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-starter-mail</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.postgresql</groupId>
            <artifactId>postgresql</artifactId>
            <scope>runtime</scope>
        </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>
        </dependency>
        <dependency>
            <groupId>org.springframework.security</groupId>
            <artifactId>spring-security-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

应用程序.yml：

server:
  error:
    include-message: always
    include-binding-errors: always

spring:
  datasource:
    password:
    url: jdbc:postgresql://localhost:5432/registration
    username:
  jpa:
    hibernate:
      ddl-auto: create-drop
    properties:
      hibernate:
        dialect: org.hibernate.dialect.PostgreSQLDialect
        format_sql: true
    show-sql: true

  mail:
    host: localhost
    port: 1025
    username: hello
    password: hello

    properties:
      mail:
        smtp:
          ssl:
            trust: "*"
          auth: true
          starttls:
            enable: true
          connectiontimeout: 5000
          timeout: 3000
          writetimeout: 5000

如果有人知道是什么问题，请帮助我

Answer 1

正如@Jesper 的回答，您的 AppUserRepository 不在 spring 应用程序上下文中。 请检查您的 spring 主 class，并确保在 Class 上方有一个名为 @EntityScan (${RepositoryPackagePrefix}) 的注释。 例如：@EntityScan("com.Example")。