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Vaadin Forum1. Vaadin Flow - Java

DragDropLayout doesn't work in Eclipse

Markus Mannila
5 years ago Sep 27, 2016 5:34pm

I'm trying to use a horizontal DragDropLayout (https://vaadin.com/directory#!addon/dragdroplayouts) for a Vaadin project following the demo. However, I can't drag any of its components when I run the project. I have set both the drag mode and the drop handler for the layout as well as the drop ratio. According to pom.xml the of Vaadin and DragDropLayout versions should be compatible (7.1.1 and 1.3.2). Is there anything I'm missing?

John Ahlroos
5 years ago Sep 27, 2016 7:25pm

Did you compile the widgetset?

Markus Mannila
5 years ago Sep 27, 2016 9:16pm

I tried to do that, but Eclipse gave me the following error message:

Select a widgetset file(..widgetset.gwt.xml) or a Vaadin project to compile.

The closest file I could find in the project was called "AppWidgetset.gtw.xml".I tried to compile the widgetset while selecting the file, but I only got a NullPointerException.

John Ahlroos
5 years ago Sep 28, 2016 6:56am

Alright, I think we now know where the issue is.

How did you create the project, with Maven, Gradle or with the Vaadin Plugin wizard?

Markus Mannila
5 years ago Sep 28, 2016 7:31am

I created it through Maven and picked the Vaadin archetype.

John Ahlroos
5 years ago Sep 28, 2016 11:24am

Could you try building the widgetset by running mvn vaadin:compile in a terminal,  or alternatively, in eclipse by right clicking on the project and selecting Run as... -> Maven build... and run the vaadin:compile goal. Do you get any errors?

Markus Mannila
5 years ago Sep 28, 2016 4:30pm

John Ahlroos: Could you try building the widgetset by running mvn vaadin:compile in a terminal,  or alternatively, in eclipse by right clicking on the project and selecting Run as... -> Maven build... and run the vaadin:compile goal. Do you get any errors?

This worked for me. Thanks!

David Wall
5 years ago Sep 28, 2016 5:17pm

We get a null pointer exception doing any widgetset compilations for 7.7.1 on Windows Eclipse.  Mac Eclipse can compile, but not on Windows, so it seems there's some issue with the vaadin plugin or 7.7.1 for Windows builds.

John Ahlroos
5 years ago Sep 29, 2016 6:52am

David Wall: We get a null pointer exception doing any widgetset compilations for 7.7.1 on Windows Eclipse.  Mac Eclipse can compile, but not on Windows, so it seems there's some issue with the vaadin plugin or 7.7.1 for Windows builds.

Seems to be a bug in the widgetset compiler https://dev.vaadin.com/ticket/20316