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Vaadin Forum4. Other

Can't create Eclipse/Vaadin 8/Maven project (pom.xml errors)

Neil Cohen
5 years ago Apr 05, 2017 4:17pm

Just downloaded the Vaadin 8 jar files and tried to create a simple web project in Eclipse. The project gets created but the pom.xml file has errors. Specifically:

"Could not get the value for parameter webappDirectory for plugin execution default (com.vaadin: vaadin-maven-plugin: 8.0.5: compile: default: process-classes)

I found something on the web that suggested deleting the /home/nbc/.m2/repository directory, cleaning the project and updating it, but that did not work. I have not used Maven before, at least not explicitly like Vaadin 8 seems to be doing. What do I need to do to get a project up and running?

Pom.xml file is attached

Thanks,

nbc

Teemu Suo-Anttila
5 years ago Apr 06, 2017 11:02am

Hi,

As a first test I created an empty folder, downloaded your pom.xml file there and ran "mvn clean package". This resulted to no errors in the maven compilation. Which version of Eclipse and Vaadin Eclipse-plugin are you running?

Neil Cohen
5 years ago Apr 06, 2017 11:39am

I am running Eclipse::Mars, and I downloaded Vaadin 8.0.5. I tried again building a Vaadin 7 project (after removing the .m2/repository directory) and that seemed to create a valid project

nbc

Gerold Broser
5 years ago Apr 10, 2017 9:25am

@Neil Re:

tried to create a simple web project in Eclipse:

Purging your local Maven repository (located in ~/.m2/repository by default which can be overridden in ~/.m2/settings.xml#<localRepository>) is usually just one of the last resorts. It may help but it potentially increases the runtime of your next build(s) significantly (if you have many or large projects) since all the dependencies, including transitive ones, have to be downloaded from Maven Central (or wherever they reside) again. And hopefully you haven't installed some with install:install-file manually. And hopefully you're not relying on own project's dependencies that were mvn installed on your machine only since then all these projects might have to be built again (if Eclipse M2E's workspace dependency resolution doesn't work or can't work because they were created in a different workspace).

A less drastic approach, if at all, is to delete just the directories of artifacts that cause issues from your local repository.