UnknownHostException on accessing jsps deployed in Ear on Websphere on ISeries

I have deployed a web application using struts .on websphere version 6 which is on iSeries server.On accessing any jsp using struts it throws a java.net.UnknownHostException: jakarta.apache.org exception.The application is using struts 1_1 dtd.Is that the problem.I have got the ear from some vendor which was deployed on Websphere on windows. But for production it has to be deployed on iSeries. Please suggest.
[7/5/08 16:02:53:349 IST] 00000090 ActionServlet E   TRAS0014I: The following exception was logged java.net.UnknownHostException: jakarta.apache.org
      at java.lang.Throwable.<init>(Throwable.java:195)
      at java.lang.Exception.<init>(Exception.java:41)
      at java.io.IOException.<init>(IOException.java:40)
      at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:153)
      at java.net.Socket.connect(Socket.java:475)
      at java.net.Socket.connect(Socket.java:425)
      at sun.net.NetworkClient.doConnect(NetworkClient.java:139)
      at sun.net.www.http.HttpClient.openServer(HttpClient.java:402)
      at sun.net.www.http.HttpClient.openServer(HttpClient.java:618)
      at sun.net.www.http.HttpClient.<init>(HttpClient.java:306)
      at sun.net.www.http.HttpClient.<init>(HttpClient.java:267)
      at sun.net.www.http.HttpClient.New(HttpClient.java:339)
      at sun.net.www.http.HttpClient.New(HttpClient.java:320)
      at sun.net.www.http.HttpClient.New(HttpClient.java:315)
      at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:521)
      at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:498)
      at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:626)
      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.commons.digester.Digester.parse(Digester.java:1548)
      at org.apache.struts.action.ActionServlet.parseModuleConfigFile(ActionServlet.java:1006)
      at org.apache.struts.action.ActionServlet.initModuleConfig(ActionServlet.java:955)
      at org.apache.struts.action.ActionServlet.init(ActionServlet.java:470)
      at javax.servlet.GenericServlet.init(GenericServlet.java:256)
      at com.ibm.ws.webcontainer.servlet.ServletWrapper.init(ServletWrapper.java:262)
      at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:444)
      at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:2841)
      at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:220)
      at com.ibm.ws.webcontainer.VirtualHost.handleRequest(VirtualHost.java:204)
      at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:1681)
      at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:77)
      at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:421)
      at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:367)
      at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:276)
      at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminaters(NewConnectionInitialReadCallback.java:201)
      at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:103)
      at com.ibm.ws.tcp.channel.impl.WorkQueueManager.requestComplete(WorkQueueManager.java:548)
      at com.ibm.ws.tcp.channel.impl.WorkQueueManager.attemptIO(WorkQueueManager.java:575)
      at com.ibm.ws.tcp.channel.impl.WorkQueueManager.workerRun(WorkQueueManager.java:934)
      at com.ibm.ws.tcp.channel.impl.WorkQueueManager$Worker.run(WorkQueueManager.java:1021)
      at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1309)
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