Eclipse FeatureNotFoundException

I ran into this error while trying to update a maven project in Eclipse (ALT+F5).

web.xml

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

and project facet

Dynamic Web Modul 3.0

Here is how I could fix it:

Removed all xmls-schema definition from the web-app element

<web-app>

then update the maven project (ALT+F5).

Re-insert the schema definitions and re-update project (ALT+F5).

According to jsp_2_1.xsd included from web-app_2_5.xsd, taglib tag should be in jsp-config tag:

<xsd:complexType name="jsp-configType">
<xsd:annotation>
  <xsd:documentation>

The jsp-configType is used to provide global configuration
information for the JSP files in a web application. It has
two subelements, taglib and jsp-property-group.

  </xsd:documentation>
</xsd:annotation>

<xsd:sequence>
  <xsd:element name="taglib"
       type="javaee:taglibType"
       minOccurs="0"
       maxOccurs="unbounded"/>
  <xsd:element name="jsp-property-group"
       type="javaee:jsp-property-groupType"
       minOccurs="0"
       maxOccurs="unbounded"/>
</xsd:sequence>
<xsd:attribute name="id" type="xsd:ID"/>

When I wrapped taglib in js-config, the error disappeared.

<jsp-config>
    <taglib>
        <taglib-uri>http://www.springframework.org/tags/form</taglib-uri>
        <taglib-location>/WEB-INF/taglibs/spring-form.tld</taglib-location>
    </taglib>
</jsp-config>

Previous parsers were probably more lenient. My config: Eclipse Luna, built-in maven 3.2.1, web.xml 2.5, Dynamic Web Project facet 2.5.

The problem is not the taglib at all, it's just a bad error description by Eclipse.

it is the project facet vs. web.xml dtd.. their versions must match!

if the web.xml says:

<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">

but the project has a

 "Dynamic Web Module 2.5"

then this error will occur.. change facet to 2.3 or web.xml to 2.5... in other words: they must match..