SOAtest starts with a default instance of Java shipped with the product, but you can configureit to run a different version or alternate distribution. If you are working with a WebSphere application, for example, you may need to run SOAtest with the IBM JRE, which enables SSL configuration for IBM MQ transports.
-Zjava_home switch and point to the alternate JRE when starting SOAtest:
soatest.exe -Zjava_home "c:/Program Files/Java/jdk1.8.0_121/"
You can also configure SOAtest to always start up with the alternate JRE by adding the switch to the Target field in the SOAtest properties: