--Environment --macOS Mojave version 10.14.5 - Eclipse 2019-03 Java Mac 64bit Full Edition(Java)
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.
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 ...
web.xml
<?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">
<!--abridgement-->
Change the version of jst.web described in {project directory} /. settings / org.eclipse.wst.common.project.facet.core.xml.
xml:org.eclipse.wst.common.project.facet.core.xml
<?xml version="1.0" encoding="UTF-8"?>
<faceted-project>
<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"/>
</faceted-project>
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