Deploy Junit test issue in javaws/preloader

When running deploy junit testing with JDK8 on win7 using command below:
 make DEPLOY_RUNTESTS=true runtests
During report generation ant exceptions are thrown complaining a result xml file was empty:

[junitreport] the file C:\deployoutput\tmp\deploy\testreports\xml\TEST-com.sun.
avaws.PreloaderTest.xml is empty.
[junitreport] This can be caused by the test JVM exiting unexpectedly

There are two problems to be addressed:
1. Why the zero length xml file is created or the root cause of the particular test case failure
2. The entire test report is not getting generated due to a single test case issue.

The issue was found on a win7 box sc11136381, which can be rdp to with id/pwd:uadmin/changeme.
ws is at C:\jdk8ws1\jdk8.