javascript - Checking exists JS function in JavaFX WebEngine -

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i need execute script file myfunctions.js in javafx webengine , send info server resttemplate: 

public void ondevicestatuschanged(devicestatusevent devicestatusevent) {          string uri = defaultpage + "my/" + "devices/status";          if (devicestatusevent.getdevstat().getdev() == 0) {             webengine.executescript("billacceptorstatus(" + devicestatusevent.getdevstat().getstatus() + ")");         }         if (devicestatusevent.getdevstat().getdev() == 1) {             webengine.executescript("posprinterstatus(" + devicestatusevent.getdevstat().getstatus() + ")");         }         if (devicestatusevent.getdevstat().getdev() == 2) {             webengine.executescript("cardreaderstatus(" + devicestatusevent.getdevstat().getstatus() + ")");         }         if (devicestatusevent.getdevstat().getdev() == 4) {             webengine.executescript("pinpadstatus(" + devicestatusevent.getdevstat().getstatus() + ")");         }         try {             if (devicestatusevent.getdevstat().getdev() == 0) {                 if (devicestatusevent.getdevstat().getstatus() == 2) {                     httpentity request = new httpentity<>(defaultheaders.getmap());                     string string = resttemplate.postforobject(defaultpage + "/my/" + "devices/ink", request, string.class);                }             }              httpentity<simpledevstat> request = new httpentity<>(devicestatusevent.getdevstat(), defaultheaders.getmap());             resttemplate.postforlocation(uri, request);             log.debug("posted : " + devicestatusevent.getdevstat());             webengine.executescript("networkstatus(true)");         } catch (exception e) {             webengine.executescript("networkstatus(false)");             e.printstacktrace();         }     }

if myfunctions.js not loaded webengine, webengine.executescript() not worked , code stop line. need check exists myfunctions.js in webengine. how check js file in webengine?


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