UploadService has suddenly stopped working due /tmp/<portalContainer>/eXoUpload deletion in EPP 5.x. How to fix it?

Issue

• When user tries to upload a file in Site Publisher, it is showed a message dialog in his web browser containing an "Unkown Error" message or "Please make sure that you uploaded the selected file to the server using the upload icon" error.

• server.log file shows the following stack trace:

  2011-09-12 10:03:32,159 WARN  [core.security.SetCurrentIdentityFilter] (http-10.23.1.32-8080-1) An error occured while cache user profile
  java.lang.RuntimeException: LocalizationFilter exception: 
      at org.exoplatform.portal.application.localization.LocalizationFilter.doFilter(LocalizationFilter.java:183)
  .
  .
  .
  Caused by: javax.servlet.ServletException: org.apache.commons.fileupload.FileUploadBase$IOFileUploadException: Processing of multipart/form-data request failed. /tmp/ecmdemo/eXoUpload/upload__6c763489_132569e7162__4e9c_00000009.tmp (No such file or directory)
      at org.exoplatform.portal.application.PortalController.onService(PortalController.java:131)
      at org.exoplatform.container.web.AbstractHttpServlet.service(AbstractHttpServlet.java:132)
      at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
      at org.exoplatform.portal.application.localization.LocalizationFilter.doFilter(LocalizationFilter.java:179)
      ... 35 more
  Caused by: org.apache.commons.fileupload.FileUploadBase$IOFileUploadException: Processing of multipart/form-data request failed. /tmp/ecmdemo/eXoUpload/upload__6c763489_132569e7162__4e9c_00000009.tmp (No such file or directory)
      at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:367)
      at org.apache.commons.fileupload.servlet.ServletFileUpload.parseRequest(ServletFileUpload.java:126)
      at org.exoplatform.upload.UploadService.createUploadResource(UploadService.java:98)
      at org.exoplatform.web.handler.UploadHandler.execute(UploadHandler.java:108)
      at org.exoplatform.web.WebAppController.service(WebAppController.java:161)
      at org.exoplatform.portal.application.PortalController.onService(PortalController.java:127)
      ... 40 more
  Caused by: java.io.FileNotFoundException: /tmp/ecmdemo/eXoUpload/upload__6c763489_132569e7162__4e9c_00000009.tmp (No such file or directory)
      at java.io.FileOutputStream.open(Native Method)
      at java.io.FileOutputStream.<init>(FileOutputStream.java:179)
      at java.io.FileOutputStream.<init>(FileOutputStream.java:131)
      at org.apache.commons.io.output.DeferredFileOutputStream.thresholdReached(DeferredFileOutputStream.java:165)
      at org.apache.commons.io.output.ThresholdingOutputStream.checkThreshold(ThresholdingOutputStream.java:221)
      at org.apache.commons.io.output.ThresholdingOutputStream.write(ThresholdingOutputStream.java:127)
      at org.apache.commons.fileupload.util.Streams.copy(Streams.java:101)
      at org.apache.commons.fileupload.util.Streams.copy(Streams.java:64)
      at org.apache.commons.fileupload.FileUploadBase.parseRequest(FileUploadBase.java:362)
      ... 45 more