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**nsanghavi** · 20 Aug 2009, 20:22

Continued post: rest of the details

Gtlcrud.html :

Code:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">

<link type="text/css" rel="stylesheet" href="Gtlcrud.css">

<title>Web Application Starter Project</title>

<script>
		var isomorphicDir = "gtlcrud/sc/";
</script>

<script type="text/javascript" language="javascript"
	src="gtlcrud/gtlcrud.nocache.js"></script>
</head>

<script src="sc/DataSourceLoader?dataSource=countries"></script>

<body>
</body>
</html>

web.xml

Code:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app
    PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
    "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>
  
  <!-- Servlets -->
  <servlet>
        <servlet-name>DataSourceLoader</servlet-name>
        <servlet-class>com.isomorphic.servlet.DataSourceLoader</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>DataSourceLoader</servlet-name>
        <url-pattern>/sc/DataSourceLoader</url-pattern>
    </servlet-mapping>
    
    
    

    <!-- The IDACall servlet handles all Built-in DataSource operations -->
    <servlet>
        <servlet-name>IDACall</servlet-name>
        <servlet-class>com.isomorphic.servlet.IDACall</servlet-class>
    </servlet>

    <!-- The DataSourceLoader servlet returns Javascript representations of the dataSources whose
         ID's are passed to it - it is an alternative to using the <loadDS> JSP tag -->
 

    <!-- The FileDownload servlet downloads static files, like a webserver -->
    <servlet>
        <servlet-name>FileDownload</servlet-name>
        <servlet-class>com.isomorphic.servlet.FileDownload</servlet-class>
    </servlet>

    <!-- //>RealtimeMessaging -->
    <!-- The MessagingServlet is used by realtime messaging -->
    <servlet>
        <servlet-name>MessagingServlet</servlet-name>
        <servlet-class>com.isomorphic.messaging.MessagingServlet</servlet-class>
    </servlet>
    <!-- //<RealtimeMessaging -->


    <!-- ISC init: initializes ISC framework -->
    <servlet>
        <servlet-name>Init</servlet-name>
        <servlet-class>com.isomorphic.base.Init</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet>
        <servlet-name>HttpProxy</servlet-name>
        <servlet-class>com.isomorphic.servlet.HttpProxyServlet</servlet-class>
    </servlet>

    <!-- The PreCache servlet initializes when the servlet engine starts up and pre-loads 
         data need for all client requests.  This is optional, and improves performance
         of the first few page requests.  PreCache cannot be invoked by a browser, because
         there is no "servlet-mapping" defined for it. -->
    <servlet>
        <servlet-name>PreCache</servlet-name>
        <servlet-class>com.isomorphic.servlet.PreCache</servlet-class>
        <load-on-startup>2</load-on-startup>
    </servlet>


   
    <!-- RPCManager uses this URL by default for Built-in DataSource operations -->
    <servlet-mapping>
        <servlet-name>IDACall</servlet-name>
        <url-pattern>/gtlcrud/sc/IDACall/*</url-pattern>
    </servlet-mapping>

    <!-- DataSourceLoader requests -->


    <servlet-mapping>
        <servlet-name>HttpProxy</servlet-name>
        <url-pattern>/gtlcrud/sc/HttpProxy/*</url-pattern>
    </servlet-mapping>

    <!-- //>RealtimeMessaging -->
    <!-- Messaging uses this URL by default -->
    <servlet-mapping>
        <servlet-name>MessagingServlet</servlet-name>
        <url-pattern>/gtlcrud/sc/messaging/*</url-pattern>
    </servlet-mapping>
    <!-- //<RealtimeMessaging -->

    <!-- Use FileDownload servlet to download all static content that's part of the skin, such as
         image files, so we can set Expires headers and other cache control directives.  In a
         production deployment, you'd want to use a webserver such as Apache to do this.  
    -->
    <servlet-mapping>
        <servlet-name>FileDownload</servlet-name>
        <url-pattern>/gtlcrud/sc/skins/*</url-pattern>
    </servlet-mapping>

    <!-- serve ISC modules compressed, with expires headers -->
    <servlet-mapping>
        <servlet-name>FileDownload</servlet-name>
        <url-pattern>/gtlcrud/sc/system/modules/*</url-pattern>
    </servlet-mapping>

    <!-- serve ISC development modules compressed, with expires headers -->
    <servlet-mapping>
        <servlet-name>FileDownload</servlet-name>
        <url-pattern>/gtlcrud/sc/system/development/*</url-pattern>
    </servlet-mapping>

    <!-- server skin assets with expires headers -->
    <servlet-mapping>
        <servlet-name>FileDownload</servlet-name>
        <url-pattern>/gtlcrud/sc/system/reference/skin/*</url-pattern>
    </servlet-mapping>
  
  <!-- Default page to serve -->
  <welcome-file-list>
    <welcome-file>Gtlcrud.html</welcome-file>
  </welcome-file-list>

</web-app>

Console error:

Code:

[ERROR] Unable to load module entry point class gtl.crud.client.Gtlcrud (see associated exception for details)
java.lang.NullPointerException: null
	at com.smartgwt.client.widgets.grid.ListGrid.setDataSource(ListGrid.java:6877)
	at gtl.crud.client.Gtlcrud.onModuleLoad(Gtlcrud.java:50)
	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.ModuleSpace.onLoad(ModuleSpace.java:326)
	at com.google.gwt.dev.shell.BrowserWidget.attachModuleSpace(BrowserWidget.java:343)
	at com.google.gwt.dev.shell.ie.BrowserWidgetIE6.access$300(BrowserWidgetIE6.java:37)
	at com.google.gwt.dev.shell.ie.BrowserWidgetIE6$External.gwtOnLoad(BrowserWidgetIE6.java:77)
	at com.google.gwt.dev.shell.ie.BrowserWidgetIE6$External.invoke(BrowserWidgetIE6.java:161)
	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:235)
	at com.google.gwt.dev.HostedModeBase.pumpEventLoop(HostedModeBase.java:558)
	at com.google.gwt.dev.HostedModeBase.run(HostedModeBase.java:405)
	at com.google.gwt.dev.HostedMode.main(HostedMode.java:232)

**Isomorphic** · 21 Aug 2009, 16:23

Your DataSource is not loading.

1. check the server-side log for errors relating to trying to load the DataSource. For one, not sure if that comment is valid, being outside of the DataSource tag

2. check the response of the DataSourceLoader servlet via Firebug - it may show an error as well, or be malformed in some obvious way.

And actually, looking at your setting of project.dataSources in server.properties, is the file actually there? You realize that since that path doesn't start with webroot, it's relative to whatever directly your application server was started in? Did you intend that?

**kashu** · 3 Jun 2010, 03:18

Hello ,I got the same problem

In my GWT mudule's HTML file
note:"ibmtest01" is my GWT module's name

this is Error
<script src="sc/DataSourceLoader?dataSource=db2admin"></script>

and this is Correct
<script src="ibmtest01/sc/DataSourceLoader?dataSource=db2admin"></script>

I forgot type my GWT module name, so [ERROR] Unable to load module entry point .

Sorry my English is very bad

**krishnafse2009** · 3 Jun 2010, 09:26

Your datasource need to be gtl/crud/client/ds directory.

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nullpointer on datasource for sample db application

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