While working on the IBM Vaadin Challenge, I ran into an issue after adding the charts component to may new project.
I implemented the charts components by adding the the following line to my ivy.xml file
and recompiled the widgetset.
Never the less, the error message appeared.
If you ( like me ) are new to Vaadin, you might spend some time to solve the puzzle. So I thought, I write a short description, how to fix this.
Goto your src folder and locate the compiled widgetset
Next, open the ..UI.java file. I contails a line similar like this
@VaadinServletConfiguration(productionMode = false, ui = ChartUI.class)
Modify the line so it will point to your widgetset ( do not include the ‘.gwt.xml’ part )
@VaadinServletConfiguration(productionMode = false, ui = ChartUI.class, widgetset="com.example.challenge.chart.widgetset.Challenge_chartWidgetset")
When you now run the application, it will display your chart.