Struts based application throws java.net.UnknownHostException: jakarta.apache.org in EAP6

Issue

• While accessing libraries from custom module that time struts based application giving "java.net.UnknownHostException: jakarta.apache.org" as following:

ERROR [org.apache.struts.validator.ValidatorPlugIn] (ServerService Thread Pool -- 68) jakarta.apache.org: java.net.UnknownHostException: jakarta.apache.org
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:178) [rt.jar:1.7.0_21]
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391) [rt.jar:1.7.0_21]
    at java.net.Socket.connect(Socket.java:579) [rt.jar:1.7.0_21]
    at java.net.Socket.connect(Socket.java:528) [rt.jar:1.7.0_21]
    at sun.net.NetworkClient.doConnect(NetworkClient.java:180) [rt.jar:1.7.0_21]
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:378) [rt.jar:1.7.0_21]
    at sun.net.www.http.HttpClient.openServer(HttpClient.java:473) [rt.jar:1.7.0_21]
    at sun.net.www.http.HttpClient.<init>(HttpClient.java:203) [rt.jar:1.7.0_21]
    at sun.net.www.http.HttpClient.New(HttpClient.java:290) [rt.jar:1.7.0_21]
    at sun.net.www.http.HttpClient.New(HttpClient.java:306) [rt.jar:1.7.0_21]
    at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:995) [rt.jar:1.7.0_21]
    at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:931) [rt.jar:1.7.0_21]
    at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:849) [rt.jar:1.7.0_21]
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1299) [rt.jar:1.7.0_21]
    at org.apache.xerces.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)
    at org.apache.xerces.impl.XMLEntityManager.startEntity(Unknown Source)
    at org.apache.xerces.impl.XMLEntityManager.startDTDEntity(Unknown Source)
    at org.apache.xerces.impl.XMLDTDScannerImpl.setInputSource(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentScannerImpl$DTDDispatcher.dispatch(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
    at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
    at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
    at org.apache.commons.digester.Digester.parse(Digester.java:1567) [commons-digester.jar:"1.5"]
    at org.apache.commons.validator.ValidatorResources.<init>(ValidatorResources.java:186) [commons-validator.jar:1.1-dev]
    at org.apache.struts.validator.ValidatorPlugIn.initResources(ValidatorPlugIn.java:233) [struts.jar:1.2.2]
    at org.apache.struts.validator.ValidatorPlugIn.init(ValidatorPlugIn.java:164) [struts.jar:1.2.2]
    at org.apache.struts.action.ActionServlet.initModulePlugIns(ActionServlet.java:839) [struts.jar:1.2.2]
    at org.apache.struts.action.ActionServlet.init(ActionServlet.java:332) [struts.jar:1.2.2]
    at javax.servlet.GenericServlet.init(GenericServlet.java:242) [jboss-servlet-api_3.0_spec-1.0.2.Final-redhat-1.jar:1.0.2.Final-redhat-1]
    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1194) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]
    at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1100) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]
    at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3591) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]
    at org.apache.catalina.core.StandardContext.start(StandardContext.java:3798) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]
    at org.jboss.as.web.deployment.WebDeploymentService.doStart(WebDeploymentService.java:156) [jboss-as-web-7.2.0.Final-redhat-8.jar:7.2.0.Final-redhat-8]
    at org.jboss.as.web.deployment.WebDeploymentService.access$000(WebDeploymentService.java:60) [jboss-as-web-7.2.0.Final-redhat-8.jar:7.2.0.Final-redhat-8]
    at org.jboss.as.web.deployment.WebDeploymentService$1.run(WebDeploymentService.java:93) [jboss-as-web-7.2.0.Final-redhat-8.jar:7.2.0.Final-redhat-8]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) [rt.jar:1.7.0_21]
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) [rt.jar:1.7.0_21]
    at java.util.concurrent.FutureTask.run(FutureTask.java:166) [rt.jar:1.7.0_21]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [rt.jar:1.7.0_21]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [rt.jar:1.7.0_21]
    at java.lang.Thread.run(Thread.java:722) [rt.jar:1.7.0_21]
    at org.jboss.threads.JBossThread.run(JBossThread.java:122)