在运行项目时。我在控制台中收到以下错误。
描述:
com.sam.cmsshoppingcart.controller.AdminPagesController中的构造函数的参数0需要找不到“ com.sam.cmsshoppingcart.models.PageRepository”类型的Bean。
行动:
考虑在配置中定义类型为“ com.sam.cmsshoppingcart.models.PageRepository”的bean。
请找到以下屏幕截图。
在此处输入图片说明
添加代码:
CmsShoppingCartApplication.Java
package com.sam.cmsshoppingcart;
@SpringBootApplication
public class CmsShoppingCartApplication {
public static void main(String[] args) {
SpringApplication.run(CmsShoppingCartApplication.class, args);
}
}
WebConfig.Java
package com.sam.cmsshoppingcart;
@Configuration
public class WebConfig implements WebMvcConfigurer {
@Override
public void addViewControllers(ViewControllerRegistry registry) {
registry.addViewController("/").setViewName("home");
}
}
家用控制器
package com.sam.cmsshoppingcart.controller;
@Controller
public class HomeController {
@GetMapping("/someRandomPage")
public String home() {
return "home";
}
}
AdminPagesController.Java
package com.sam.cmsshoppingcart.controller;
@Controller
@RequestMapping("/admin/pages")
public class AdminPagesController {
@Autowired
private PageRepository pageRepo;
public AdminPagesController(PageRepository pageRepo) {
this.pageRepo = pageRepo;
}
@GetMapping
public String index(Model model) {
List<Page> pages = pageRepo.findAll();
model.addAttribute("pages", pages);
return "/admin/pages/index";
}
}
PageRepository.Java
package com.sam.cmsshoppingcart.models;
import org.springframework.data.jpa.repository.JpaRepository;
import com.sam.cmsshoppingcart.models.data.Page;
public interface PageRepository extends JpaRepository<Page, Integer>{
}
页面
package com.sam.cmsshoppingcart.models.data;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import lombok.Data;
@Entity
@Table(name="pages")
@Data
public class Page {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;
private String title;
private String slug;
private String content;
private int sorting;
}
POM文件
<?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>2.2.4.RELEASE</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>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web-services</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<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>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>5.3.7.Final</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>2.2.6.RELEASE</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
<version>5.1.6</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
最佳答案
显然,配置中缺少PageRepository
bean。在@Repository
顶部添加@Component
或PageRepository
@Repository
public interface PageRepository extends JpaRepository<Page, Integer>{}