Vaadin 10 Upload problem

Vaadin 6 / 7 / 8
1

Hello,

Does anyone know why mu upload SucceededListener is sometimes called and sometimes is not?
I make Vaadin Upload component and add a listener to it, and in listener I put System.out.println(“SUCCEEDED”).
Sometimes is printed when file is uploaded, and sometimes doesn’t upload file at all.
I am using Vaadin 10 with Spring boot starter pack.

Thank you!

2

Hello Stefan,

i have the same problem. I’m trying out vaadin and wanted to use upload. I only use java not direct html. My files never get uploaded. I also have an UploadReceiver attached with some println or logs… something that just gets called.

So i cannot help you. But perhaps we could investigate this together.

3

Hello Daniel,

I solved this problem. I had a problem with Vaadin 10 version and it didn’t work on 10.7. I have changed Vaadin version in my pom.xml file to 10.6 and now it is working. I hope that this will help you :slight_smile:

4

Hello Stefan,

that solved it. I changed to Version 10.0.6 and Spring Boot 2.0.3.RELEASE (10.0.6 did not start with Spring Boot 2.0.10.RELEASE).
I would file a bug report if i knew what to write, but i don’t have any information but that it does not work.

Thank you again!

import javax.annotation.PostConstruct;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.vaadin.flow.component.Text;
import com.vaadin.flow.component.button.Button;
import com.vaadin.flow.component.html.Div;
import com.vaadin.flow.component.notification.Notification;
import com.vaadin.flow.component.upload.Upload;
import com.vaadin.flow.component.upload.receivers.MemoryBuffer;
import com.vaadin.flow.router.Route;

@Route("")
public class MainUI extends Div {

	private Upload upload;
	MemoryBuffer buffer = new MemoryBuffer();
	
	private static final Logger LOG = LoggerFactory.getLogger(MainUI.class);

	@PostConstruct
	public void init() {
		upload = new Upload(buffer);
		upload.onEnabledStateChanged(true);
		upload.addSucceededListener(event -> {
			Text text = new Text(event.getFileName());
			add(text);
		});
		add(upload);
	}

}