Eclipse: JSF: schema_reference.4: Failed to read schema document 'platform:/plugin/org.eclipse.xsd/cache/www.w3.org/2001/xml.xsd'

>PROBLEM 

Eclipse returns on face-config.xml file the following message:

  schema_reference.4: Failed to read schema document 'platform:/plugin/org.eclipse.xsd/cache/www.w3.org/2001/xml.xsd'

>SOLUTION

1. Test the URLs pointing them on the browse to make sure that they exist.

<?xml version="1.0" encoding="UTF-8"?>

<faces-config version="2.2" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-facesconfig_2_2.xsd">

2. If all URLs points to a valid page, try to change something on the page and save again.

In this example, the "faces-config" element was rearranged like this:

<?xml version="1.0" encoding="UTF-8"?>

<faces-config version="2.2" xmlns="http://xmlns.jcp.org/xml/ns/javaee"

 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

 xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-facesconfig_2_2.xsd">

>ENV

st03ajs

jsf2.2

java13

wildfly8