I posted this in the comments on the article but people here might have a better idea of what the issue is. I followed all the steps in this article and ran into the following issue. Upon initial load of the application, I get the following error:

TypeError: Error #1009: Cannot access a property or method of a null object reference.
at weborb.messaging::WeborbMessagingClient/connect()[/Users/mark/dev/weborb/Java/build/tmp/weborbswc/weborb/messaging/WeborbMessagingClient.as:292]
at weborb.data::DataServiceClient$/subscribe()[/Users/mark/dev/weborb/Java/build/tmp/weborbswc/weborb/data/DataServiceClient.as:120]
at weborb.data::DataMapperProxy()[/Users/mark/dev/weborb/Java/build/tmp/weborbswc/weborb/data/DataMapperProxy.as:29]
at weborb.data::DataMapper()[/Users/mark/dev/weborb/Java/build/tmp/weborbswc/weborb/data/DataMapper.as:284]
at test.w4j.weborb.Codegen::_ContactDataMapper()
at test.w4j.weborb::ContactDataMapper()
at test.w4j.weborb.Codegen::_DataMapperRegistry/get Contact()[C:\Users\nathan.tyler\Adobe Flash Builder 4\W4jArticle\src\test\w4j\weborb\Codegen\_DataMapperRegistry.as:16]
at test.w4j.weborb::ActiveRecords$/get Contact()[C:\Users\nathan.tyler\Adobe Flash Builder 4\W4jArticle\src\test\w4j\weborb\ActiveRecords.as:10]
at W4jArticle/refresh()[C:\Users\nathan.tyler\Adobe Flash Builder 4\W4jArticle\src\W4jArticle.mxml:32]
at W4jArticle/___W4jArticle_Application1_creationComplete()[C:\Users\nathan.tyler\Adobe Flash Builder 4\W4jArticle\src\W4jArticle.mxml:8]
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at mx.core::UIComponent/dispatchEvent()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\UIComponent.as:12528]
at mx.core::UIComponent/set initialized()[E:\dev\4.x\frameworks\projects\framework\src\mx\core\UIComponent.as:1627]
at mx.managers::LayoutManager/doPhasedInstantiation()[E:\dev\4.x\frameworks\projects\framework\src\mx\managers\LayoutManager.as:759]
at mx.managers::LayoutManager/doPhasedInstantiationCallback()[E:\dev\4.x\frameworks\projects\framework\src\mx\managers\LayoutManager.as:1072]


After dismissing this, I can click on "Retrieve" and successfully pull in the data. Any thoughts?

Hi there,

I know, this topic is kinda old but I still have the same problem and I'm totally surprised that I'm, obviously, the only one.

All comes back to this article http://www.adobe.com/devnet/flex/articles/datadriven-flex-java-applications.html

Yes, I've read the comments and I saw the solution. But I have no file called weborb-services-config.xml, just the services-config.xml which is maybe the same one. But it's not working.

The init of the mapper is failing on the first call. On the second invoke, everything is fine. The function is called by a button click. And If I put the ActiveRecords.News.findAll() directly as dataprovider of a e.g. datagrid, everything works fine.

public function loadData():ArrayCollection
{
var responder:mx.rpc.Responder;
responder = new mx.rpc.Responder( gotData, gotError );
return ActiveRecords.News.findAll( responder );
}

That's my called function and the error is:


TypeError: Error #1009: Cannot access a property or method of a null object reference.
at weborb.messaging::WeborbMessagingClient/connect()[/Volumes/HD2/nightly_builds/wojava/build/tmp/weborbswc/weborb/messaging/WeborbMessagingClient.as:292]
at weborb.data::DataServiceClient$/subscribe()[/Volumes/HD2/nightly_builds/wojava/build/tmp/weborbswc/weborb/data/DataServiceClient.as:120]
at weborb.data::DataMapperProxy()[/Volumes/HD2/nightly_builds/wojava/build/tmp/weborbswc/weborb/data/DataMapperProxy.as:29]
at weborb.data::DataMapper()[/Volumes/HD2/nightly_builds/wojava/build/tmp/weborbswc/weborb/data/DataMapper.as:48]
at starchat.Codegen::_NewsDataMapper()
at starchat::NewsDataMapper()
at starchat.Codegen::_DataMapperRegistry/get News()[C:\development\projects\webOrbTest2\src\starchat\Codegen\_DataMapperRegistry.as:74]
at starchat::ActiveRecords$/get News()[C:\development\projects\webOrbTest2\src\starchat\ActiveRecords.as:34]
at webOrbTest2/loadData()[C:\development\projects\webOrbTest2\src\webOrbTest2.mxml:36]
at webOrbTest2/findAllCtl_clickHandler()[C:\development\projects\webOrbTest2\src\webOrbTest2.mxml:51]
at webOrbTest2/___webOrbTest2_Button1_click()[C:\development\projects\webOrbTest2\src\webOrbTest2.mxml:59]


Any solutions or ideas?

Thanks,
Paul

Make sure to reinstall WebORB with the RTMP feature enabled. The file will show up after that.

Regards,
Mark

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Mark Piller
Midnight Coders, Inc.
twitter: midnightcoder
blog: blog.themidnightcoders.com
website: www.themidnightcoders.com