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POCall Java from JavaScript gwt
 

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    <p>Hi I have the following strange issue:</p> <p>I have gwt application. it contains 3 image widgets and a button. on Button click I am calling function X() and then inside X I am calling Test(testscan instance) by passing instance to the Javascript function. </p> <p>now take a look at Test function. I am trying to call Java function named "updateImageContent" from there.The syntax written according GWT documentation. </p> <p>When I run the application the instance of "testscan" class is Null what can be the reason?</p> <pre><code>public class testscan implements EntryPoint { private Image image_0 = new Image("home.gif"); public void onModuleLoad() { RootPanel rootPanel = RootPanel.get("main_panel"); rootPanel.getElement().getStyle().setPosition(Position.RELATIVE); VerticalPanel verticalPanel = new VerticalPanel(); rootPanel.add(verticalPanel, 5, 5); verticalPanel.setSize("100%", "100%"); HorizontalPanel horizontalPanel = new HorizontalPanel(); verticalPanel.add(horizontalPanel); horizontalPanel.setSize("100%", "100%"); Image image_1 = new Image("home.gif"); horizontalPanel.add(image_1); image_1.setSize("180px", "180px"); horizontalPanel.add(image_0); image_0.setSize("180px", "180px"); Image image_2 = new Image("home.gif"); horizontalPanel.add(image_2); image_2.setSize("180px", "180px"); Button btnScan = new Button("Scan"); verticalPanel.add(btnScan); btnScan.addClickHandler(new ClickHandler() { public void onClick(ClickEvent event) { x(); } }); } public void x() { Test(this); } public native void Test(testscan instance) /*-{ instance.@com.sflpro.testscan.client.testscan::updateImageContent()(); }-*/; public void updateImageContent() { Window.alert("ok"); //String s = scanFileContent(); //Window.alert(s); if(image_0==null) Window.alert("bad"); else Window.alert("good"); } </code></pre>
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