web application deployment in weblogic failure : Proxy authentication failure

I'm trying to deploy a web application in weblogic 11g server. When I deploy this application, weblogic is throwing following error(Stack trace is below).

Once I hit the URL of this application, it has to create a SOAP message and hit a cloud application using HTTPS protocol. We have a proxy server in between. When I hit the URL of web application it takes some time and browser respond with blank page(500). I checked weblogic server log and found this exception. Also I have set the system properties for proxy with required proxy IP and port in the web application while creating the URL to hit the cloud application. I am not able the find the exact issue. Went through many online forum and post and tried many solution. Could not find an exact solution. I'm new to weblogic server. Do not have much idea about this. Was all ready with the web application to deploy in tomcat server. At the last moment client came up with webloigc server and a proxy server in between. Any suggestions and comments will be highly appreciated.

Thanks in advance

java.net.ProtocolException: Proxy or Server Authentication Required
at weblogic.socket.utils.ProxyUtils.getAuthInfo(ProxyUtils.java:279)
at weblogic.socket.utils.ProxyUtils.getProxySocket(ProxyUtils.java:199)
at weblogic.socket.utils.ProxyUtils.getSSLClientProxy(ProxyUtils.java:239)
at weblogic.socket.SocketMuxer.newSSLClientSocket(SocketMuxer.java:397)
at weblogic.socket.JSSESocketFactory.getConnectedSocket(JSSESocketFactory.java:92)
at weblogic.socket.JSSESocketFactory.createSocket(JSSESocketFactory.java:65)
at weblogic.security.SSL.SSLSocketFactory.createSocket(SSLSocketFactory.java:140)
at weblogic.net.http.HttpsClient.openServer(HttpsClient.java:289)
at weblogic.net.http.HttpsClient.openServer(HttpsClient.java:363)
at weblogic.net.http.HttpsClient.New(HttpsClient.java:518)
at weblogic.net.http.HttpsURLConnection.getHttpClient(HttpsURLConnection.java:330)
at weblogic.net.http.HttpURLConnection.getInputStream(HttpURLConnection.java:450)
<our custom methods are here to create SOAP XML to hit a cloud application>
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:397)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:301)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:184)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3732)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3696)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2273)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2179)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1490)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)