Actually I just found this - will try
"Command Line JVM Settings
The proxy settings are given to the JVM via command line arguments:
$ java -Dhttp.proxyHost=proxyhostURL
-Dhttp.proxyPort=proxyPortNumber
-Dhttp.proxyUser=someUserName
-Dhttp.proxyPassword=somePassword javaClassToRun "
#webMethods#webMethods-BPMS#MWS-CAF-Task-Engine