UIMA-4060 fixed NPE

git-svn-id: https://svn.apache.org/repos/asf/uima/sandbox/uima-ducc/trunk@1646529 13f79535-47bb-0310-9956-ffa450edef68
UIMA-4060 added more logging

git-svn-id: https://svn.apache.org/repos/asf/uima/sandbox/uima-ducc/trunk@1646540 13f79535-47bb-0310-9956-ffa450edef68
UIMA-4069 DUCC Job Driver (JD) system classpath

Preemption works!

git-svn-id: https://svn.apache.org/repos/asf/uima/sandbox/uima-ducc/trunk@1646568 13f79535-47bb-0310-9956-ffa450edef68