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DataSource references in your ejb should get automatically mapped to the Resource you declare. The shortest and easiest rule is that if your reference name matches a Resource in your openejb.xml, that's the one you get.  Essentially, the rules for mapping are as follows.

1. Injected Name Attribute Match - variable @Resource with a name attribute matching the resource name gets that resource injected
2. Injected Name Attribute Match - @Resource with a variable name attribute matching the resource name gets that resource injected
3. No Match - nothing matches a resource name, so the first resource available gets injected

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