JNDI Connection refused error

HI
I am new to Java so please excuse my stupid questions and general lack of ignorance. I am trying to connect to an Oracle database using JNDI to retrieve a Datasource using a 'data-source.xml' file but I get a 'Connection refused' error I am at a total loss at what this can be, I just have a simple Java Class which gets an InitialContext then does a lookup from here but this is were it fails.
Could anybody give me any idea as to where to look. Could it be a problem with the JNDI server itself?. I'm using JDeveloper 10.1.3 and am just trying to run it in the embedded server.
Sorry for the general rambling nature of this post and please ask me to provide any extra information required.
Any help would be much appreciated as I'm going nowhere with this at the moment and very frustrated as have searched everywhere with no results.
Thanks
Andy

Hi
Thanks for the reply. I have checked my data-sources.xml and this all seems fine. I can even connect to the DB using DriverManager rather than the JNDI method. One thing that confuses me is which data-sources.xml it is using as there appear to be many. In JDeveloper you can specify the data sources in 'embeeded oc4j preferences' plus create your own under meta-inf. Which is being used when run in embedded, maybe thats obvious the first one?
thanks once again

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