What does this web.xml error mean?

Question

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

<web-app version="2.5" 
    xmlns="http://java.sun.com/xml/ns/j2ee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd">

Referenced file contains errors (http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd). For more information, right click on the message in the Problems View and select "Show Details..."

The errors below were detected when validating the file "web-app_2_5.xsd" via the file "web.xml". In most cases these errors can be detected by validating "web-app_2_5.xsd" directly. However it is possible that errors will only occur when web-app_2_5.xsd is validated in the context of web.xml.

In details, I see a bunch of these:

s4s-elt-character: Non-whitespace characters are not allowed in schema elements other than xs:appinfo and xs:documentation. Saw 'var _U="undefined";'

Contuse

Sometimes it is a bug in Eclipse. Take a look how to disable the validation: #67272027 – Routine

Answer 1

If you replace j2ee by javaee, it will work fine.

EDIT :

<web-app version="2.5" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

Edit:

To know anything further related to this error. Please follow the Link. Here you will find schemas for Java EE deployment descriptors (web.xml).

Stogy

wtf..this is annoying! – Lozier

@jhohlfeld the list of schemas by release is currently here: oracle.com/webfolder/technetwork/jsc/xml/ns/javaee/index.html Schemas java <= 1.4 are use j2ee and schemas for >= 1.5 use javaee – Middleweight

I have this declaration and the error is still present – Dedededen

@Satzzadur Rahaman Can you explain why this is showing error? – Bulbiferous

In case it is not working as for @RonyeVernaes, check out this other question: #32539254 – Putt

<web-app xmlns="java.sun.com/xml/ns/j2ee" xmlns:xsi="w3.org/2001/XMLSchema-instance" xsi:schemaLocation="java.sun.com/xml/ns/j2ee java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" version="2.4"> im getting errors for this – Mukund

Answer 2

replace

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd">

with

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee;http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd">

The solution is that you have to put semicolon between URLs

I am sure you will not get the error again :)

Rebus

What is the reasoning to do this? The error did go away, but I don't know what will be side effects – Moulden

When I use this declaration, the validator says that "Cannot find the declaration of element'web-app'" – Dedededen

After adding a semicolon in my case (is a faces-config) the error (not on my mac eclipse only in my linux eclipse) went away but got a warning message: no grammar constraints (DTD or XML Schema) referenced in the document. – Miltonmilty

Answer 3

I suggest you add ; between 2 passages: xsi:schemaLocation="http://java.sun.com/xml/ns/javaee and http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

Like this:

:xsi:schemaLocation="http://java.sun.com/xml/ns/javaee;http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

Sculpture

Answer 4

Add semicolon between xsi:schemaLocation just as shown below

"http://java.sun.com/xml/ns/javaee;http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"

This resolved my this error in <servlet-name> tag line as well.

"cvc-id.3: A field of identity constraint 'web-common-servlet-name-uniqueness' matched element 'web-app', but this element does not have a simple type."

Shanell

Answer 5

In my case, I had replaced

xsi:schemaLocation="http://java.sun.com/../.."

with

xsi:schemaLocation="http://xmlns.jcp.org/../.."

Cheers!

Kala

Answer 6

On the surface it appears that the schemaLocation is wrong. Resolving it appears to redirect to a HTML page rather than a XSD schema.

I would suggest simply removing this line unless you really want to do XSD validation at runtime. Bear in mind the relevant parts will be validated by your servlet container.

Gulp

Answer 7

Replacing the schemaLocation as below has resovled the error for me:

xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/j2ee; http://xmlns.jcp.org/xml/ns/j2ee/web-app_2_4.xsd"

V2

Answer 8

In case my solution is helpful for anyone. My problem was similar (same error although for a different XSD) and I have posted my solution to this also similar question: https://mcmap.net/q/452206/-eclipse-web-xml-quot-referenced-file-contains-errors-quot-duplicate.

Counterclockwise