Ensemble2Auto test (which clicks on Ensemble samples automatically) failed with OOM
after about 23 hours. Heap dump analysis shows that 178 mb (from total 256) is
occupied by com.sun.webpane.sg.prism.FXGraphicsManager. The memory of this class
is mostly occupied by floatArrMap (110 mb) and intArrMap (60 mb). See also WCGraphicsManager_heap.GIF
attached.

It looks like there is some memory leak in web view.
It could be also possible that Ensemble's "Web View" sample doesn't properly uses or
destroys some web view related objects. So, please have a look at
jfx/apps/ga-samples/Ensemble/src/ensemble/samples/web/WebViewSample.java and advise.