Vaadin is running in BOWER mode.
This mode will be unsuported in future Vaadin versions.
Please correct the typo: “unsuported” => “unsupported”.
Any pointer to documentation for running in npm mode? Also, how do we migrate the existing “bower” stuff? (I have a couple of Web Components to migrate).
We have not yet taken the time to write any comprehensive instructions for how to convert your project to use npm mode instead of Bower mode, but that’s something that we’ll get to quite soon. We’re also planning to create a conversion tool that will automatically take care of all the basic cases.
Please also notice that Vaadin 14 is Long-Term Support release which means that Bower mode will still be along for many years to come. You will only have to convert before upgrading to Vaadin 15 (which is not yet even released) or newer.
Thanks Leif
When I am trying to run demo project in eclipse with payara server getting this error. I have downloaded demo project from there https://vaadin.com/start/latest/simple-ui which is HTML + JAVA Simple UI project. How I can run with npm mode.
Vaadin is running in BOWER mode.
This mode will be unsuported in future Vaadin versions.
Caused by: java.lang.IllegalStateException: Couldn’t find the definition of the element with tag ‘reviews-list’ in any template file declared using @‘HtmlImport’ annotations. Check the availability of the template files in your WAR file or provide alternative implementation of the method getTemplateContent() which should return an element representing the content of the template file
at com.vaadin.flow.component.polymertemplate.DefaultTemplateParser.getTemplateContent(DefaultTemplateParser.java:128)
at com.vaadin.flow.component.polymertemplate.TemplateDataAnalyzer.parseTemplate(TemplateDataAnalyzer.java:200)
at com.vaadin.flow.component.polymertemplate.TemplateInitializer.(TemplateInitializer.java:91)
at com.vaadin.flow.component.polymertemplate.PolymerTemplate.(PolymerTemplate.java:88)
at com.vaadin.flow.component.polymertemplate.PolymerTemplate.(PolymerTemplate.java:103)
at com.yahoo.bishwajit.ui.views.reviewslist.ReviewsList.(ReviewsList.java:76)
… 56 more
https://vaadin.com/start/latest/simple-ui is still generating projects that use Vaadin 13, so I don’t understand how you can get a version that even contain that warning message.
Furthermore, that project contains an HTML template which means that it would currently require some manual migration to work to update it to use JavaScript modules instead of HTML imports.
If you want to try the in-development Vaadin 14 version that uses npm mode, then you can get it from https://github.com/vaadin/beverage-starter-flow instead.
Hi Leif,
Thanks for you reply. Sorry I have wrongly added the URL. I have created v14.0.0.beta2 version HTML + JAVA project from pre-release url https://vaadin.com/start/pre-release/simple-ui and trying to run eclipse with payara5 full server.
Thanks
Bishwajit
Seems like for some reason, some key files end up in a different location than where Vaadin is looking for them. We have a slightly similar situation in a different case as well, which we plan on fixing by moving those files to the classpath instead of finding them through the servlet context. We should come back and reevaluate the situation for this issue as well when we’ve made that change.