title: java.lang.reflect.InvocationTargetException while executing webemgine.executescript
body: <p>I am using <strong>JavaFX</strong> to highlight text in a webview. But when I run my code; following exceptions occurs.Can someone give me a solution please.</p>
  
  <p>Thanks in advance.
  Edit: I've added the full stack of errors below. As I was suggested.</p>
  
  <pre><code>@FXML
  private void _do_highlight(WebEngine engine, String _text) {
    engine.executeScript("$('body').removeHighlight().highlight('" + _text + "')");
  }    
  @FXML
  private void hcone(MouseEvent event) {
      str = one.getText();  // 'one' is a Textfield ... 
      if (submited == true) {    
          WebEngine engine = webview.getEngine();  
          engine.loadContent("&lt;body&gt;&lt;div id='content'&gt;Hello asdfasdfasdf&lt;/div&gt;&lt;/body&gt;");
          _do_highlight(engine, str); // Each time str is found in webview, it must be highlighted
      }
  }
  </code></pre>
  
  <p>This error Occurs </p>
  
  <pre><code>Exception in thread "JavaFX Application Thread" java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
  at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1762)
  at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1645)
  at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
  at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
  at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
  at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
  at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
  at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
  at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
  at javafx.event.Event.fireEvent(Event.java:198)
  at javafx.scene.Scene$ClickGenerator.postProcess(Scene.java:3437)
  at javafx.scene.Scene$ClickGenerator.access$7900(Scene.java:3365)
  at javafx.scene.Scene$MouseHandler.process(Scene.java:3733)
  at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3452)
  at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1728)
  at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2461)
  at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:348)
  at     com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:273)
  at java.security.AccessController.doPrivileged(Native Method)
  at              com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:382)
  at com.sun.glass.ui.View.handleMouseEvent(View.java:553)
  at com.sun.glass.ui.View.notifyMouse(View.java:925)
  at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
  at com.sun.glass.ui.win.WinApplication.lambda$null$141(WinApplication.java:102)
  at com.sun.glass.ui.win.WinApplication$$Lambda$37/584634336.run(Unknown Source)
  at java.lang.Thread.run(Thread.java:745)
  Caused by: java.lang.reflect.InvocationTargetException
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:483)
  at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)
  at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:483)
  at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)
  at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1757)
  ... 30 more
  Caused by: netscape.javascript.JSException: ReferenceError: Can't find variable: $
  at com.sun.webkit.dom.JSObject.fwkMakeException(JSObject.java:128)
  at com.sun.webkit.WebPage.twkExecuteScript(Native Method)
  at com.sun.webkit.WebPage.executeScript(WebPage.java:1426)
  at javafx.scene.web.WebEngine.executeScript(WebEngine.java:948)
  at bioassignment.StringOccurenceController._a_highlight(StringOccurenceController.java:83)
  at bioassignment.StringOccurenceController.hcone(StringOccurenceController.java:96)
  ... 40 more
  </code></pre>