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/10.4@1491632 13f79535-47bb-0310-9956-ffa450edef68