Class-loading in jboss-web descriptor causes deployments to fail on AS 7

17:41:58,830 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-6) MSC000001: Failed to start service jboss.deployment.unit."apache-continuum-1.4.2.war".PARSE: org.jboss.msc.service.StartException in service jboss.deployment.unit."apache-continuum-1.4.2.war".PARSE: JBAS018733: Failed to process phase PARSE of deployment "apache-continuum-1.4.2.war"
        at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:166) [jboss-as-server-7.4.2.Final-redhat-2.jar:7.4.2.Final-redhat-2]
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1980) [jboss-msc-1.1.5.Final-redhat-1.jar:1.1.5.Final-redhat-1]
        at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1913) [jboss-msc-1.1.5.Final-redhat-1.jar:1.1.5.Final-redhat-1]
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_55]
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_55]
        at java.lang.Thread.run(Thread.java:745) [rt.jar:1.7.0_55]
Caused by: org.jboss.as.server.deployment.DeploymentUnitProcessingException: JBAS018014: Failed to parse XML descriptor "/content/apache-continuum-1.4.2.war/WEB-INF/jboss-web.xml" at [26,3]
        at org.jboss.as.web.deployment.JBossWebParsingDeploymentProcessor.deploy(JBossWebParsingDeploymentProcessor.java:79)
        at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:159) [jboss-as-server-7.4.2.Final-redhat-2.jar:7.4.2.Final-redhat-2]
        ... 5 more
Caused by: javax.xml.stream.XMLStreamException: ParseError at [row,col]:[26,3]
Message: Unexpected element 'class-loading' encountered
        at org.jboss.metadata.parser.util.MetaDataElementParser.unexpectedElement(MetaDataElementParser.java:109)
        at org.jboss.metadata.parser.jbossweb.JBossWebMetaDataParser.parse(JBossWebMetaDataParser.java:210)
        at org.jboss.as.web.deployment.JBossWebParsingDeploymentProcessor.deploy(JBossWebParsingDeploymentProcessor.java:71)
        ... 6 more