Upload events not fired on Vaadin 11.0.2

Downloaded the latest bakery starter (11.0.2), added a simple view with a simple upload component. None of the upload related event listeners are fired. With 11.0.0 and 11.0.1 it worked.

@Route(value = "upload", layout = MainView.class)
@PageTitle(BakeryConst.TITLE_UPLOAD)
public class UploadView extends VerticalLayout {

    public UploadView() {
        MemoryBuffer singleBuffer = new MemoryBuffer();
        Upload upload = new Upload(singleBuffer);
        upload.setAutoUpload(true);
        upload.addSucceededListener(event -> System.out.println("hi")); // prints "hi" only in 11.0.0/.1, not in .2 

        add(upload);
    }
}

[denis-anisimov]

One more time : Upload works with Flow with any version. Flow doesn’t introduce any new issue/code which influence on this behavior.

Spring add-on has a workaround which allows to have a servlet mapped to “/*” along with Spring endpoints. It does it via forwarding. In previous Spring add-on version there was one solution which caused other issues. But this solution allowed to work Upload in some cases. There was a bug about the same thing with @EnableMVC annotation. Currently the previous solution is removed completely and as a result forwarding works inconsistently with Upload. There is nothing to do in Flow. It’s a pure Spring add-on issue.

[nuriaruiz]

Downloaded the latest bakery starter (11.0.2), added a simple view with a simple upload component. None of the upload related event listeners are fired. With 11.0.0 and 11.0.1 it worked.

@Route(value = "upload", layout = MainView.class)
@PageTitle(BakeryConst.TITLE_UPLOAD)
public class UploadView extends VerticalLayout {

    public UploadView() {
        MemoryBuffer singleBuffer = new MemoryBuffer();
        Upload upload = new Upload(singleBuffer);
        upload.setAutoUpload(true);
        upload.addSucceededListener(event -> System.out.println("hi")); // prints "hi" only in 11.0.0/.1, not in .2 

        add(upload);
    }
}

I solved it by putting this in application.properties: spring.servlet.multipart.enabled = false