[JAVA] You cannot change the project facet version from a dynamic web module to x.x. How to deal with

--Environment --macOS Mojave version 10.14.5 - Eclipse 2019-03 Java Mac 64bit Full Edition(Java)

I got angry when I imported an existing Maven project

Messages on the "Problems" tab of Eclipse

(Japanese version)
Project facet version from Dynamic Web Module 3.Cannot be changed to 0.
(English edition)
Cannot change version of project facet Dynamic Web Module to 3.0.

Cause: You can't downgrade a dynamic module?

Eclipse's dynamic web module settings cannot be started by mistake | Tsukabi's technical diary I'm not sure why it can't be lowered ... I didn't mean to lower the version ... Even though it was written as 3.0 in web.xml from the beginning ...


<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

Action: Change version in ʻorg.eclipse.wst.common.project.facet.core.xml`

Change the version of jst.web described in {project directory} /. settings / org.eclipse.wst.common.project.facet.core.xml.


<?xml version="1.0" encoding="UTF-8"?>
  <fixed facet="wst.jsdt.web"/>
  <installed facet="jst.web" version="3.0"/> <!--Change the version here-->
  <installed facet="wst.jsdt.web" version="1.0"/>
  <installed facet="java" version="1.6"/>

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