Batch uploader with custom datasources

Hi,

I am trying to get the batch uploader to work as shown in the EE showcase.
However, albeit I set the

Code:

batchUploader.setUploadDataSource(MyCustomRPCDataSource.getInstance());

, the first time the form is shown SmartGWT instantly tries to call the IDA DS (which is not appropriately configured as I did not need it so far) resulting in the following error:

Code:

17:40:46.292:XRP0:WARN:RPCManager:Transport error - HTTP code: 404 for URL: http://localhost:8080/myApplication/sc/IDACall, response: {operationId: "batchUpload_loadSchema",
clientContext: undef,
context: Obj,
transactionNum: 2,
httpResponseCode: 404,
httpResponseText: "<html><head><title>Apache Tomcat/7.0.27 ..."[1123],
xmlHttpRequest: [object XMLHttpRequest],
transport: "xmlHttpRequest",
status: -90,
clientOnly: undef,
httpHeaders: Obj,
isStructured: true,
callbackArgs: null,
results: Obj,
data: "Transport error - HTTP code: 404 for URL..."[120]}

RPC request from the Dev console is

Code:

{
    "actionURL":"http://localhost:8080/myApplication/sc/IDACall", 
    "showPrompt":true, 
    "prompt":"loading datasource 'batchUpload'", 
    "transport":"xmlHttpRequest", 
    "promptStyle":"cursor", 
    "callback":"isc.DS.$37y(rpcResponse,data,rpcRequest)", 
    "data":{
        "appID":"builtinApplication", 
        "operation":"batchUpload_loadSchema", 
        "values":{
        }
    }
}

If afterwards a file is selected and the upload button pressed the error reads

Code:

17:38:43.214:MUP6:WARN:Log:TypeError: isc.DataSource.getDataSource(this.dataSource) is null
Stack from error.stack:
    unnamed() @ myApplication/sc/modules/ISC_DataBinding.js:1813
    unnamed() @ myApplication/sc/modules/ISC_DataBinding.js:1803
    unnamed(isc_BatchUploader_uploa) @ myApplication/sc/modules/ISC_DataBinding.js:3958
    unnamed(anonymou) @ myApplication/sc/modules/ISC_Core.js:62
    unnamed(isc_StatefulCanvas_handleActivat) @ myApplication/sc/modules/ISC_Foundation.js:337
    unnamed(isc_StatefulCanvas_handleClic) @ myApplication/sc/modules/ISC_Foundation.js:339
    unnamed(isc_c_EventHandler_bubbleEven) @ myApplication/sc/modules/ISC_Core.js:1795
    unnamed(isc_c_EventHandler_handleClic) @ myApplication/sc/modules/ISC_Core.js:1623
    unnamed(isc_c_EventHandler__handleMouseU) @ myApplication/sc/modules/ISC_Core.js:1609
    unnamed(isc_c_EventHandler_handleMouseU) @ myApplication/sc/modules/ISC_Core.js:1600
    unnamed(isc_c_EventHandler_dispatc) @ myApplication/sc/modules/ISC_Core.js:1857
    unnamed(anonymou) @ myApplication/sc/modules/ISC_Core.js:62
    unnamed() @

The RPC tab in the dev console in this case shows

Code:

{
    "actionURL":"http://localhost:8080/myApplication/sc/IDACall", 
    "showPrompt":false, 
    "transport":"xmlHttpRequest", 
    "promptStyle":"cursor", 
    "data":{
        "appID":"isc_builtin", 
        "className":"com.isomorphic.tools.BuiltinRPC", 
        "methodName":"setAttributes", 
        "arguments":[
            "session", 
            [
                {
                    "name":"dsName", 
                    "type":"hidden", 
                    "value":"waypointDS"
                }, 
                {
                    "name":"delimiter", 
                    "type":"hidden", 
                    "value":","
                }, 
                {
                    "name":"quoteString", 
                    "type":"hidden", 
                    "value":"\""
                }
            ], 
            null
        ], 
        "is_ISC_RPC_DMI":true
    }
}

So does it mean it is impossible to use the BatchUploader with datasources other than the built-in ones?
If not, what am I doing wrong here?
Related question: Is it possible to embed the batch upload form in a ToolStrip or change its layout (upload and submit button arrangement)?

SmartGWT with SmartClient Version: SNAPSHOT_v8.3d_2012-08-27/PowerEdition Deployment (built 2012-08-27)
FF 14,01

Thanks

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