Code:
String repositoryURL = "https://igartc02.swg.usma.ibm.com/jazz";
        String projectArea = "CIOLab";
        String userNmae = "IBM intranet id";
        String password = "IBM Intranet password";
         String originalFile="C:/work/RTC_creator/upload_temp/Jayee8.xls";
        String resultFile="C:/work/RTC_creator/upload_temp/Jayee8_re.xls";
        IProgressMonitor monitor = new NullProgressMonitor();

         TeamPlatform.startup();
           ITeamRepository teamRepository = TeamPlatform.getTeamRepositoryService().getTeamRepository(repositoryURL);
            System.out.println("begin to log in");
           teamRepository.registerLoginHandler(new DefaultLoginHandler(userNmae,password));
            try {
            teamRepository.login(monitor);
            System.out.println("After Log in");
        } catch (Exception e) {
            e.printStackTrace();
        }

I set the userName and password as my IBM account. Following is what I have tested in different ways. And I imported all the jar files downloaded from Jazz.
1. Junit test.
    I create a Junit function in Eclipse to test. It works.
2. Tomcat test.
    I paste above code in a JSP file and deploy the application on a Tomcat. It works.
3. Websphere test.
   I paste above code in a JSP file and deploy the application on a Websphere(V7 and V8 I used). It doesn't       work.  Following is the error line:

ITeamRepository teamRepository = TeamPlatform.getTeamRepositoryService().getTeamRepository(repositoryURL); 

 Following is the errror:
    com.ibm.websphere.servlet.error.ServletErrorReport: java.lang.ExceptionInInitializerError
    at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:695)
    at com.ibm._jsp._test._jspService(_test.java:118)
    at com.ibm.ws.jsp.runtime.HttpJspBase.service(HttpJspBase.java:99)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1663)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:939)
    at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:502)
    at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:181)
    at com.ibm.wsspi.webcontainer.servlet.GenericServletWrapper.handleRequest(GenericServletWrapper.java:121)
    at com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionServletWrapper.handleRequest(AbstractJSPExtensionServletWrapper.java:259)
    at com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionProcessor.handleRequest(AbstractJSPExtensionProcessor.java:353)
    at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3944)
    at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:276)
    at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:931)
    at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1592)
    at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:186)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:452)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:511)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:305)
    at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:276)
    at com.ibm.ws.ssl.channel.impl.SSLConnectionLink.determineNextChannel(SSLConnectionLink.java:1049)
    at com.ibm.ws.ssl.channel.impl.SSLConnectionLink.readyInboundPostHandshake(SSLConnectionLink.java:717)
    at com.ibm.ws.ssl.channel.impl.SSLConnectionLink$MyHandshakeCompletedCallback.complete(SSLConnectionLink.java:413)
    at com.ibm.ws.ssl.channel.impl.SSLUtils.handleHandshake(SSLUtils.java:1066)
    at com.ibm.ws.ssl.channel.impl.SSLHandshakeIOCallback.complete(SSLHandshakeIOCallback.java:87)
    at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
    at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
    at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
    at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138)
    at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204)
    at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775)
    at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905)
    at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1646)
Caused by: java.lang.ExceptionInInitializerError
    at java.lang.J9VMInternals.initialize(J9VMInternals.java:222)
    at com.ibm.team.repository.client.internal.TeamRepository.<init>(TeamRepository.java:417)
    at com.ibm.team.repository.client.internal.TeamRepositoryService.createSharedTeamRepository(TeamRepositoryService.java:526)
    at com.ibm.team.repository.client.internal.TeamRepositoryService.getTeamRepository(TeamRepositoryService.java:112)
    at com.ibm.team.repository.client.internal.TeamRepositoryService.getTeamRepository(TeamRepositoryService.java:131)
    at com.ibm._jsp._test._jspService(_test.java:101)
    ... 31 more
Caused by: java.lang.IllegalArgumentException: The type name Contributor and the namespace URI com.ibm.team.repository do not resolve to an IItemType.
    at com.ibm.team.repository.common.internal.querypath.AbstractQueryPathModel$Implementation.getItemType(AbstractQueryPathModel.java:191)
    at com.ibm.team.repository.common.query.IQuery$Factory.newInstance(IQuery.java:93)
    at com.ibm.team.repository.client.internal.ContributorManager.createAllContributorsQuery(ContributorManager.java:72)
    at com.ibm.team.repository.client.internal.ContributorManager.<clinit>(ContributorManager.java:60)
    at java.lang.J9VMInternals.initializeImpl(Native Method)
    at java.lang.J9VMInternals.initialize(J9VMInternals.java:200)
    ... 36 more