java.io.IOException: Server returned HTTP response code: 502 for URL: http://XXX:9080/sso-reg/servlets/sso/app/SSOLogoutServlet?paramObj=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    Getting 502 error when opening URLConnection

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    Root Cause Analysis

    1. java.io.IOException

      Server returned HTTP response code: 502 for URL: http://XXX:9080/sso-reg/servlets/sso/app/SSOLogoutServlet?paramObj=aced00057372001d636f6d2e736f6674656f6e2e73736f2e55524c506172616d6574657273f7439f0669cbd72002000a4c000866726d4c6f67696e7400124c6a6176612f6c616e672f537472696e673b4c000870617373776f726471007e00014c000a7265666572657255726c71007e00014c000d7265717565737453746174757371007e00014c000b726571756573745479706571007e00014c000c72657365744d65737361676571007e00014c000873736f417070496471007e00014c0005746f6b656e71007e00014c000675736572496471007e00014c00117573657250726f66696c654f626a6563747400234c636f6d2f736f6674656f6e2f73736f2f5573657250726f66696c654f626a6563743b787074000071007e000471007e000471007e000471007e000471007e000471007e000471007e000474000a4a54415254414d4f534170

      at sun.net.www.protocol.http.HttpURLConnection.getInputStream()
    2. Java RT
      HttpURLConnection.getHeaderFieldKey
      1. sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1178)
      2. sun.net.www.protocol.http.HttpURLConnection.getHeaderFieldKey(HttpURLConnection.java:1948)
      2 frames
    3. com.softeon.eso
      SSOLoginAction.ssoLogout
      1. com.softeon.eso.pwishared.csr.login.actions.SSOLoginAction.ssoLogout(SSOLoginAction.java:420)
      1 frame
    4. Java RT
      Method.invoke
      1. sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      2. sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
      3. sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      4. java.lang.reflect.Method.invoke(Method.java:615)
      4 frames
    5. struts
      RequestProcessor.process
      1. org.apache.struts.actions.DispatchAction.dispatchMethod(DispatchAction.java:276)
      2. org.apache.struts.actions.DispatchAction.execute(DispatchAction.java:196)
      3. org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
      4. org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226)
      4 frames
    6. com.softeon.eso
      ESORequestProcessor.process
      1. com.softeon.eso.shared.service.ESORequestProcessor.process(ESORequestProcessor.java:38)
      1 frame
    7. struts
      ActionServlet.doGet
      1. org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
      2. org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:397)
      2 frames
    8. JavaServlet
      HttpServlet.service
      1. javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
      2. javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
      2 frames
    9. WebSphere
      WebAppFilterChain.doFilter
      1. com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1146)
      2. com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1087)
      3. com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:145)
      3 frames
    10. com.link.oscar
      AbsoluteSendRedirectFilter.doFilter
      1. com.link.oscar.view.framework.filter.AbsoluteSendRedirectFilter.doFilter(Unknown Source)
      1 frame
    11. WebSphere
      ServletWrapper.handleRequest
      1. com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:190)
      2. com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:130)
      3. com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:87)
      4. com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:837)
      5. com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:680)
      6. com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:588)
      6 frames
    12. com.ibm.ws
      ServletWrapper.handleRequest
      1. com.ibm.ws.wswebcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:525)
      1 frame
    13. WebSphere
      WebContainer.handleRequest
      1. com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:90)
      2. com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:751)
      2 frames
    14. com.ibm.ws
      WCChannelLink.ready
      1. com.ibm.ws.wswebcontainer.WebContainer.handleRequest(WebContainer.java:1478)
      2. com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:126)
      2 frames
    15. WebSphere
      AioReadCompletionListener.futureCompleted
      1. com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:458)
      2. com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:387)
      3. com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:267)
      4. com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
      5. com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
      6. com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165)
      6 frames
    16. com.ibm.io
      ResultHandler$2.run
      1. com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)
      2. com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161)
      3. com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:136)
      4. com.ibm.io.async.ResultHandler.complete(ResultHandler.java:196)
      5. com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:751)
      6. com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:881)
      6 frames
    17. com.ibm.ws
      ThreadPool$Worker.run
      1. com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1497)
      1 frame