Exception when trying to create V10 design in V8 project

[szolo]

Steps to reproduce

1. Open V8 project.
2. Try to create V10 design.

Actual behavior

java.lang.NullPointerException
	at com.vaadin.designer2.services.flow.webjar.WebjarUtil.cleanupWebjarImport(WebjarUtil.java:198)
	at com.vaadin.designer2.eclipse.wizards.NewFlowWizardPage.calculateProjectFromPath(NewFlowWizardPage.java:148)
	at com.vaadin.designer2.eclipse.wizards.NewFlowWizardPage.<init>(NewFlowWizardPage.java:103)
	at com.vaadin.designer2.eclipse.wizards.NewFlowWizard.addPages(NewFlowWizard.java:61)

Expected behavior

Hide exception. In IntelliJ if you select V10 design wizard says later that Polymer dependencies are missing. Same behavior should be present in Eclipse.

IDE, Designer and OS version

Windows 10, Eclipse Oxygen , Designer 3.0.2

[ripla]

I think we should hide the option to create V10 designs in V8 projects. Is that possible?

[szolo]

@ripla sure, I think it's possible. We need to do it in IntelliJ as well.

[ripla]

This could be reproducible in V10 projects as well. Maybe a malformed project?

[szolo]

@ripla needs to be checked, after project import dependencies should be available with Eclipse API.

[ripla]

It should be possible to create designs in any kind of project. If it's not possible due to a technical limitation, show a message.