Problem in getting Portal Mapped user and password in Web Dynpro iView

I am developing a webdynpro iview.My app need to read mapped user and password form a system in Portal runtime.
I used the following codes in my Web Dynpro java program:
     IWDClientUser user = WDClientUser.getCurrentUser();
     IUser iuser = user.getSAPUser();
     IUserMappingService iums = (IUserMappingService)WDPortalUtils.getServiceReference(IUserMappingService.KEY );
//     IUserMappingService iums = (IUserMappingService)
//     PortalRuntime.getRuntimeResources().getService(IUserMappingService.KEY);
     IUserMappingData iumd = iums.getMappingData (systemalias, iuser);
     Map map = new HashMap ();
     iumd.enrich(map);
     String userid = (String)map.get( "user" );
     String pwd = (String)map.get ("mappedpassword");
I've add a sharing references in project properties,the value is "PORTAL:sap.com/com.sapportals.portal.prt.service.usermapping.IUserMappingService"
But when I run the iview on my Portal, it goes wrong, the message is:
com.sap.engine.services.deploy.container.DeploymentException: Clusterwide exception: Failed to prepare application ''local/HomePage'' for startup. Reason= Clusterwide exception: Failed to start dependent library ''com.sapportals.portal.prt.service.usermapping.IUserMappingService'' of application ''local/HomePage''. Status of dependent component: STATUS_MISSING. Hint: Is the component deployed correctly on the engine?
    at com.sap.engine.services.webdynpro.WebDynproContainer.prepareStart(WebDynproContainer.java:1490)
    at com.sap.engine.services.deploy.server.application.StartTransaction.prepareCommon(StartTransaction.java:231)
    at com.sap.engine.services.deploy.server.application.StartTransaction.prepareLocal(StartTransaction.java:184)
    at com.sap.engine.services.deploy.server.application.ApplicationTransaction.makeAllPhasesLocal(ApplicationTransaction.java:365)
    at com.sap.engine.services.deploy.server.application.ParallelAdapter.runInTheSameThread(ParallelAdapter.java:117)
Anybody can help me?And are there anyother methods can get mapped user and password of Portal systems in Web Dynpro JAVA.

Hi Wayne,
Did you added com.sap.security.api.jar to your webdynpro project. if not follow this steps.
1. Right-click the project in Eclipse or SAP NetWeaver Developer Studio.
2. Select Properties.
3. Choose Java build path -> Libraries -> Add Variable -> Select variable WD_RUNTIME -> Extend -> com.sap.security -> lib -> com.sap.security.api.jar.
I hope this should solve your problem.
Regards, Suresh KB

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