I have resolved the problem. It was more simple as it seem.
The <identity property> idusuario I defined in the dataservice (flex-data-service.xml) was empty when I call my java code, so when I get the dataservice result it says :
Error: Item requested at index 0 was null and should not have been. Error for service 'usuario'
Now, I'm trying to know why this field is coming back empty from the database query, and I'm using another field to define the <identity property> in the dataservice.
Thanks for your response.
--
Manuel Bordallo
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