DERBY-6251; nightly regression test failure on weme, derbyrunjartest failing with: Process exception: (2) The system cannot find the file specified. 
  backport of revision 1491566 from 10.9


git-svn-id: https://svn.apache.org/repos/asf/db/derby/code/branches/10.6@1491608 13f79535-47bb-0310-9956-ffa450edef68