A new Java Polymer template class doesn't work with JRebel

[denis-anisimov]

Steps to reproduce:

• checkout skeleton starter project https://github.com/vaadin/skeleton-starter-flow
• add a new template file into frontend/src folder (see example below)
• Run project using JRebel.
• Check that it works ( load the project URL in the browser).
• Add a new Java class ( extend PolymerTemplate ) which uses the module file added above (see example below).
• Reload the browser once JRebel noted changes. The result is : exception ( see below). Expected result: component should be shown on the page.

@Tag("my-el")
@JsModule("./src/my-component.js")
public class MyComp extends PolymerTemplate<TemplateModel> {

}

import { PolymerElement } from '@polymer/polymer/polymer-element.js';
import { html } from '@polymer/polymer/lib/utils/html-tag.js';

class MyComponentElement extends PolymerElement {
  static get template() {
    return html`
        <button id="button">Click</button>
        <div id="content"></div>
    `;
  }

  static get is() {
    return 'my-el'
  }
}

customElements.define(MyComponentElement.is, MyComponentElement);

Caused by: java.lang.IllegalStateException: Couldn't find the definition of the element with tag 'my-el' in any template file declared using '@JsModule' 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.NpmTemplateParser.getTemplateContent(NpmTemplateParser.java:140)
    at com.vaadin.flow.component.polymertemplate.TemplateDataAnalyzer.parseTemplate(TemplateDataAnalyzer.java:200)
    at com.vaadin.flow.component.polymertemplate.TemplateInitializer.<init>(TemplateInitializer.java:91)
    at com.vaadin.flow.component.polymertemplate.PolymerTemplate.<init>(PolymerTemplate.java:88)
    at com.vaadin.flow.component.polymertemplate.PolymerTemplate.<init>(PolymerTemplate.java:103)
    at com.vaadin.starter.skeleton.MyComp.<init>(MyComp.java:29)
    at com.vaadin.starter.skeleton.MainView.<init>(MainView.java:25)

[pleku]

This would need to a hook to attach to the JRebel reload and then trigger the new polymer template file to be picked. Currently the changes are not ending up into a new stats json file that webpack dev server creates.