Java 8 optional No value present

I have made this function and used optional although my image is not getting returned and is throwing an error NO VALUE PRESENT even though my db (MySQL) has data stored with the name

@GetMapping(path = { "/get/{imageName}" })
public ImageModel getImage(@PathVariable("imageName") String imageName) throws IOException {
    final Optional<ImageModel> retrievedImage = imageRepository.findByName(imageName);
    ImageModel img = new ImageModel(retrievedImage.get().getName(), retrievedImage.get().getType(),
    decompressBytes(retrievedImage.get().getPic()));
    return img;
}

This is my dao class

public interface ImageRepository extends JpaRepository<ImageModel, Long> {
Optional<ImageModel> findByName(String name);
Optional<ImageModel> findById(Long id);
}

This is my model class where i have defined mysql database

@Entity
@Table(name = "image_table")
public class ImageModel {
public ImageModel() {
super();
}
public ImageModel(String name, String type, byte[] pic) {
this.name = name;
this.type = type;
this.pic = pic;
}
@Id
@Column(name = "id")
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@Column(name = "name")
private String name;
//image bytes can have large lengths so we specify a value
//which is more than the default length for picByte column
@Column(name = "pic", length = 1000)
private byte[] pic;
@Column(name = "type")
private String type;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public byte[] getPic() {
return pic;
}
public void setPic(byte[] pic) {
this.pic = pic;
}
}

The hint is in the name. An Optional object refers to something that doesn't necessarily have to be there. You need to tell the app what to do if an instance of Optional is not present:

final Optional<ImageModel> retrievedImage = imageRepository.findByName(imageName);
return retrievedImage.get().orElse(null);

WRT your data query not returning what you're looking for, I would say that is a separate issue, and the code you have given doesn't detail that query of the database.

The optional pattern ( also monad) lets you control the flow if data is present or not, which helps you avoid null pointer exceptions ( the billion dollar mistake)

You can take advandage of the optional pattern by either using:

1. optional.ifPresent(e-> decompress(e))

2. optional.orElseGet( return a new Image) if this is the use case.

3. optional.orElseThrow(...) for example if you want to throw an exception if there's no
   image present in the database and stop the flow in this way.

4. use optional.isPresent() in an if condition to hanadle the the case in which the image is null.

And control your flow more precisely and