java - 由 : NoSuchBeanDefinitionException: No qualifying bean of type xxx expected at least 1 bean which qualifies as autowire candidate 引起

Question

我有下面的代码:

package far.botshop.backend.controller;

/**
 */
import java.util.logging.Logger;

import far.botshop.backend.storage.StorageService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

@Controller
public class FileUploadController {

    private final StorageService storageService;

    @Autowired
    public FileUploadController(StorageService storageService) {
        this.storageService = storageService;
    }

并创建以下类:

package far.botshop.backend.storage;

import org.springframework.boot.context.properties.ConfigurationProperties;

@ConfigurationProperties("storage")
public class StorageProperties {
    /**
     * Folder location for storing files
     */
    private String location = "upload-dir";

    public String getLocation() {
        return location;
    }

    public void setLocation(String location) {
        this.location = location;
    }

}

我相信 StorageProperties 应该很容易找到，但出于某种原因我收到了这个错误:

UnsatisfiedDependencyException: Error creating bean with name 'fileSystemStorageService' defined in file [/home/x/workspace/botshop-backend-java/target/classes/far/botshop/backend/storage/FileSystemStorageService.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'far.botshop.backend.storage.StorageProperties' available: expected at least 1 bean which qualifies as autowire candidate.

有什么想法吗？

Answer 1

你正在尝试

@Autowired
    public FileUploadController(StorageService storageService) {
        this.storageService = storageService;
    }

但您还没有将 StorageService 定义为 Bean。

因此，您应该在 StorageService 类上添加 @Component 注释或等效注释。