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    #1

    help!!!why : new JSONObject(new Record().getJsObj()); error

    help!!!!

    I m writed a simple code
    for example :

    public void onModuleLoad() {
    DataSource dataSource=new DataSource();
    DataSourceIntegerField a1=new DataSourceIntegerField("id","id");
    a1.setPrimaryKey(true);
    DataSourceTextField a2=new DataSourceTextField("name","name");
    DataSourceIntegerField a3=new DataSourceIntegerField("age","age");
    dataSource.setFields(a1,a2,a3);
    dataSource.setClientOnly(true);
    dataSource.setDataFormat(DSDataFormat.XML);
    dataSource.setRecordXPath("/list/record");
    dataSource.setDataURL("/aa.xml");
    final ListGrid ll=new ListGrid();
    ll.setDataSource(dataSource);
    ll.setAutoFetchData(true);
    ll.draw();
    ll.addRecordClickHandler(new RecordClickHandler(){
    public void onRecordClick(RecordClickEvent event) {
    Record temp=ll.getSelectedRecord();
    System.out.println(new JSONObject(temp.getJsObj()));
    Record temp2=new Record();
    temp2.setAttribute("id", 4);
    temp2.setAttribute("name", "testtest4");
    temp2.setAttribute("age", 66);
    System.out.println(new JSONObject(temp2.getJsObj()));
    }
    });
    }


    why
    System.out.println(new JSONObject(temp.getJsObj())); SUCCESS?
    why
    System.out.println(new JSONObject(temp2.getJsObj())); Throw Exception??


    I want new a Record and set some Attribute param after convert the JSON.

    the console print:

    {"id":2, "name":"testtest2", "age":12, "_selection_1":true}
    java.lang.ClassCastException
    at java.lang.Class.cast(Class.java:2990)
    at com.google.gwt.dev.shell.JsValueGlue.get(JsValueGlue.java:122)
    at com.google.gwt.dev.shell.ie.SwtOleGlue.convertVariantsToObjects(SwtOleGlue.java:57)
    at com.google.gwt.dev.shell.ie.IDispatchImpl.callMethod(IDispatchImpl.java:119)
    at com.google.gwt.dev.shell.ie.IDispatchProxy.invoke(IDispatchProxy.java:155)
    at com.google.gwt.dev.shell.ie.IDispatchImpl.Invoke(IDispatchImpl.java:294)
    at com.google.gwt.dev.shell.ie.IDispatchImpl.method6(IDispatchImpl.java:194)
    at org.eclipse.swt.internal.ole.win32.COMObject.callback6(COMObject.java:117)
    at org.eclipse.swt.internal.ole.win32.COM.VtblCall(Native Method)
    at org.eclipse.swt.internal.ole.win32.IDispatch.Invoke(IDispatch.java:64)
    at org.eclipse.swt.ole.win32.OleAutomation.invoke(OleAutomation.java:493)
    at org.eclipse.swt.ole.win32.OleAutomation.invoke(OleAutomation.java:417)
    at com.google.gwt.dev.shell.ie.ModuleSpaceIE6.doInvokeOnWindow(ModuleSpaceIE6.java:68)
    at com.google.gwt.dev.shell.ie.ModuleSpaceIE6.doInvoke(ModuleSpaceIE6.java:153)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:453)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:231)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.google.gwt.json.client.JSONParser.createObject(JSONParser.java)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.ie.IDispatchImpl.callMethod(IDispatchImpl.java:126)
    at com.google.gwt.dev.shell.ie.MethodDispatch.invoke(MethodDispatch.java:97)
    at com.google.gwt.dev.shell.ie.IDispatchImpl.Invoke(IDispatchImpl.java:294)
    at com.google.gwt.dev.shell.ie.IDispatchImpl.method6(IDispatchImpl.java:194)
    at org.eclipse.swt.internal.ole.win32.COMObject.callback6(COMObject.java:117)
    at org.eclipse.swt.internal.ole.win32.COM.VtblCall(Native Method)
    at org.eclipse.swt.internal.ole.win32.IDispatch.Invoke(IDispatch.java:64)
    at org.eclipse.swt.ole.win32.OleAutomation.invoke(OleAutomation.java:493)
    at org.eclipse.swt.ole.win32.OleAutomation.invoke(OleAutomation.java:417)
    at com.google.gwt.dev.shell.ie.ModuleSpaceIE6.doInvokeOnWindow(ModuleSpaceIE6.java:68)
    at com.google.gwt.dev.shell.ie.ModuleSpaceIE6.doInvoke(ModuleSpaceIE6.java:153)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:453)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:231)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.google.gwt.json.client.JSONObject.get0(JSONObject.java)
    at com.google.gwt.json.client.JSONObject.get(JSONObject.java:89)
    at com.google.gwt.json.client.JSONObject.toString(JSONObject.java:183)
    at java.lang.String.valueOf(String.java:2827)
    at java.io.PrintStream.println(PrintStream.java:771)
    at com.mycompany.project.client.ImageViewer$1.onRecordClick(ImageViewer.java:44)
    at com.smartgwt.client.widgets.grid.events.RecordClickEvent.dispatch(RecordClickEvent.java:96)
    at com.smartgwt.client.widgets.grid.events.RecordClickEvent.dispatch(RecordClickEvent.java:1)
    at com.google.gwt.event.shared.HandlerManager$HandlerRegistry.fireEvent(HandlerManager.java:65)
    at com.google.gwt.event.shared.HandlerManager$HandlerRegistry.access$1(HandlerManager.java:53)
    at com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:178)
    at com.smartgwt.client.widgets.BaseWidget.fireEvent(BaseWidget.java:71)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.ie.IDispatchImpl.callMethod(IDispatchImpl.java:126)
    at com.google.gwt.dev.shell.ie.IDispatchProxy.invoke(IDispatchProxy.java:155)
    at com.google.gwt.dev.shell.ie.IDispatchImpl.Invoke(IDispatchImpl.java:294)
    at com.google.gwt.dev.shell.ie.IDispatchImpl.method6(IDispatchImpl.java:194)
    at org.eclipse.swt.internal.ole.win32.COMObject.callback6(COMObject.java:117)
    at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
    at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:1925)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2966)
    at com.google.gwt.dev.SwtHostedModeBase.processEvents(SwtHostedModeBase.java:264)
    at com.google.gwt.dev.HostedModeBase.pumpEventLoop(HostedModeBase.java:557)
    at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:405)
    at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)
    Tags: None
    #2
    aa.xml :

    <list>
    <record><id>1</id><name>testtest1</name><age>32</age></record>
    <record><id>2</id><name>testtest2</name><age>12</age></record>
    <record><id>3</id><name>testtest3</name><age>22</age></record>
    </list>

    thanks

    Comment

      #3
      Originally posted by wangzi
      Code:
      public void onRecordClick(RecordClickEvent event) {
	Record temp=ll.getSelectedRecord();
	System.out.println(new JSONObject(temp.getJsObj()));
	Record temp2=new Record();
	temp2.setAttribute("id", 4);
	temp2.setAttribute("name", "testtest4");
	temp2.setAttribute("age", 66);
	System.out.println(new JSONObject(temp2.getJsObj()));
}
      System.out.println(new JSONObject(temp.getJsObj())); SUCCESS?
      why
      System.out.println(new JSONObject(temp2.getJsObj())); Throw Exception??
      Probably because temp2.getJsObj returns null since you didn't pass any JavaScriptObject to the constructor of Record.
      Try this:
      Code:
      Record r=new Record(JavaScriptObject.createObject());
r.setAttribute("hello", "world!");
String json=new JSONObject(r.getJsObj()).toString();
      P.S. please try to cleanup your posts, don't paste console output unless required. tip: use "CODE" tags

      Comment

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