I am working on migrating a large 4.0.5.GA webapplication to AS 7.

Currently I am getting a Parse error on the <taglib> element in my web.xml.

Here is the full error:

10:55:44,051 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-1) MSC00001: Failed to start service jboss.deployment.unit."webapp.war".PARSE: org.jboss.msc.service.StartException in s

        at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:121)

        at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1765)

        at org.jboss.msc.service.ServiceControllerImpl$ClearTCCLTask.run(ServiceControllerImpl.java:2291)

        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [:1.6.0_21]

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [:1.6.0_21]

        at java.lang.Thread.run(Thread.java:619) [:1.6.0_21]

Caused by: org.jboss.as.server.deployment.DeploymentUnitProcessingException: Failed to parse "/c:/jboss/jboss-as-7.1.0.Alpha1-SNAPSHOT/standalone/deployments/webapp.war/WEB-INF/web.xml"

        at org.jboss.as.web.deployment.WebParsingDeploymentProcessor.deploy(WebParsingDeploymentProcessor.java:67)

        at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:115)

        ... 5 more

Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[164,2]

Message: Unexpected element '{http://java.sun.com/xml/ns/j2ee}taglib' encountered

        at org.jboss.metadata.parser.util.MetaDataElementParser.unexpectedElement(MetaDataElementParser.java:109)

        at org.jboss.metadata.parser.servlet.WebMetaDataParser.parse(WebMetaDataParser.java:204)

        at org.jboss.metadata.parser.servlet.WebMetaDataParser.parse(WebMetaDataParser.java:53)

        at org.jboss.as.web.deployment.WebParsingDeploymentProcessor.deploy(WebParsingDeploymentProcessor.java:65)

        ... 6 more

10:55:44,051 INFO  [org.jboss.as.server.controller] (DeploymentScanner-threads - 1) Deployment of "webapp.war" was rolled back with failure message {"Failed services" => {"jboss.deployment.unit.\"webapp.war\".PARSE" => "org.jboss.msc.service.StartException in service jboss.deployment.unit.\"webapp.war\".PARSE: Failed to process phase PARSE of deployment \"webapp.war\""}}

10:55:44,051 INFO  [org.jboss.as.controller] (DeploymentScanner-threads - 1) Service status report

  Services which failed to start:

      service jboss.deployment.unit."webapp.war".PARSE: org.jboss.msc.service.StartException in service jboss.deployment.unit."webapp.war".PARSE: Failed to process phase PARSE of deployment "webapp.war"

10:55:44,051 ERROR [org.jboss.as.deployment] (DeploymentScanner-threads - 2) {"Composite operation failed and was rolled back. Steps that failed:" => {"Operation step-2" => {"Failed services" => {"jboss.deployment.unit.\"webapp.war\".PARSE" => "org.jboss.msc.service.StartException in service jboss.deployment.unit.\"webapp.war\".PARSE: Failed to process phase PARSE of deployment \"webapp.war\""}}}}

10:55:44,348 INFO  [org.jboss.as.server.deployment] (MSC service thread 1-2) Stopped deployment webapp.war in 299ms

web.xml looks like:

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

<web-app version="2.4" 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_4.xsd">

...

<taglib>                       <---- line 64

    <taglib-uri>/tags/struts-tiles</taglib-uri>

    <taglib-location>

        /WEB-INF/tags/struts/struts-tiles.tld

    </taglib-location>

</taglib>

<taglib>

    <taglib-uri>/tags/struts-bean</taglib-uri>

    <taglib-location>

        /WEB-INF/tags/struts/struts-bean.tld

    </taglib-location>

</taglib>

... more taglib elements ...

Any ideas why the taglib element is now a problem in web.xml ? 

TIA for any help !