构造函数的参数 0 需要一个类型为“FileStoragePropertiesAedImages”的 bean

Question

I have been on stack in several threads regarding this question although I still can not figure it out.

Parameter 0 of constructor in com.aed.demo.fileupload.FileStorageServiceAedImages required a bean of type 'com.aed.demo.fileupload.FileStoragePropertiesAedImages' that could not be found.

Action:

Consider defining a bean of type 'com.aed.demo.fileupload.FileStoragePropertiesAedImages' in your configuration.

I have created a FileStorageService and a FileStorageProperties files

File Storage Properties

@ConfigurationProperties(prefix = "file")
public class FileStorageProperties {
    private String uploadDir;

    public String getUploadDir() {
        return uploadDir;
    }

    public void setUploadDir(String uploadDir) {
        this.uploadDir = uploadDir;
    }
}

File Storage Service

@Service
public class FileStorageService {

    private final Path fileStorageLocation;

    @Autowired
    public FileStorageService(FileStorageProperties fileStorageProperties) {
        
        
        this.fileStorageLocation = Paths.get(fileStorageProperties.getUploadDir())
                .toAbsolutePath().normalize();

        try {
            Files.createDirectories(this.fileStorageLocation);
        } catch (Exception ex) {
            throw new FileStorageException("Could not create the directory where the uploaded files will be stored.", ex);
        }
    }

   ...
}

the above set up works like a charm and creates the directory file.upload-dir=home/.. that it's defined in the application.properties

I tried duplicating these two configurations with another file upload directory in application.properties

Second FileStorageProperties Class

@ConfigurationProperties(prefix = "aed")
public class FileStoragePropertiesAedImages {
    private String uploadDir;

    public String getUploadDir() {
        return uploadDir;
    }

    public void setUploadDir(String uploadDir) {
        this.uploadDir = uploadDir;
    }
}

Second FileStorageService

@Service
public class FileStorageServiceAedImages {
    private final Path fileStorageLocation;

    @Autowired
    public FileStorageServiceAedImages(FileStoragePropertiesAedImages fileStoragePropertiesAED) {
        this.fileStorageLocation = Paths.get(fileStoragePropertiesAED.getUploadDir())
                .toAbsolutePath().normalize();

        try {
            Files.createDirectories(this.fileStorageLocation);
        } catch (Exception ex) {
            throw new FileStorageException("Could not create the directory where the uploaded files will be stored.", ex);
        }
    }
   ...
}

and then the above error is thrown. I need to create 3 directories that I've defined like so in application.properties

file.upload-dir=home/..
mobile.upload-dir=mobile/..
aed.upload-dir=aed/..

prefixes are correct, why the second storage service can not be initialized and requires a bean type and the first one does not?

Answer 1

what you are doing is constructor autowiring at FileStorageServiceAedImages which requires bean of type FileStoragePropertiesAedImages but you have not defined bean of the type. You just added @ ConfigurationProperties to the FileStorageProperties . Adding @Configuration to FileStorageProperties will create the bean you required at FileStoragePropertiesAedImages .

Add @Configuation annotation to FileStoragePropertiesAedImages class should solve the problem.

@ConfigurationProperties(prefix = "aed")
@Configuation
public class FileStoragePropertiesAedImages {