Java Webstart JNLP memory
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To add some argument to the javaws process add the heap-size args to the already existing j2se tag:
<resources>
<j2se version="1.8+" initial-heap-size="1024m" max-heap-size="4096m" />
</resources>
To double check if the change has any influence you might have a look into this runtime variable:
jnlpx.heapsize 1024m,4096m
Which can be seen for example in the system info view of a Jenkins slave node. Which was my playground for fixing this.