Note: this advanced option screen is reachable by selecting the "Java invocation" step and choosing "Preferred VM" from the Advanced options popup menu or by clicking directly on the index.
-client
switch when invoking
java
from the command line.
-server
switch when invoking
java
from the command line.
Please note that it is not an error if the selected JVM is not present for the found JRE. install4j will simply use another JVM to launch your application in that case.