java.io.IOException: mark/reset not supported

One of our vendors is posting a file to our server and below is the error I am receiving..Can you tell me why this would happen? Is it on the server side? Thanks for your help


java.io.IOException: mark/reset not supported
      at java.io.InputStream.reset(InputStream.java:351)
      at com.expressdx.servlet.EdiGisbUpload.process(EdiGisbUpload.java:639)
      at com.expressdx.servlet.EdiGisbUpload.doPost(EdiGisbUpload.java:413)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java(Compiled Code))
      at javax.servlet.http.HttpServlet.service(HttpServlet.java(Compiled Code))
      at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java(Compiled Code))
      at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java(Compiled Code))
      at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java(Compiled Code))
      at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java(Compiled Code))
      at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java(Compiled Code))
      at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java(Compiled Code))
      at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java(Compiled Code))
      at com.ibm.ws.http.channel.inbound.impl.HttpICLReadCallback.complete(HttpICLReadCallback.java(Compiled Code))
      at com.ibm.ws.tcp.channel.impl.WorkQueueManager.requestComplete(WorkQueueManager.java(Compiled Code))
      at com.ibm.ws.tcp.channel.impl.WorkQueueManager.attemptIO(WorkQueueManager.java(Compiled Code))
      at com.ibm.ws.tcp.channel.impl.WorkQueueManager.workerRun(WorkQueueManager.java(Compiled Code))
      at com.ibm.ws.tcp.channel.impl.WorkQueueManager$Worker.run(WorkQueueManager.java(Compiled Code))
      at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java(Compiled Code))