Nightly(regression) : javaws is ignoring property deployment.javaws.traceFileName

Tested Build: latest 7-client nightly build
It has been noticed as part of nightly runs that javaws test cases are failing since javaws is totally ignoring the property deployment.javaws.traceFileName and our automation driver depends on this property to parse the javaws testcase trace output. Since javaws is not dumping any trace inside location defined against this property , hence tests failed. This is a regression and got introduced in 7-client build on August30th

Steps to reproduce:
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1) Install 7 client nightly build
2) set following inside the deployment.properties file
deployment.trace=true
deployment.javaws.traceFileName=C\:/javawsTonga.trace
or
deployment.javaws.traceFileName=C\:\\javawsTonga.trace
3) Invoke any javaws application
If trace is not getting generated inside "C:" with name of javawsTonga.trace then bug is reproduced