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These instructions are for Atomikos 3.3 onwards, and have been verified against Atomikos 3.4.2. If you are using an older version, see #Older #Configuration for older versions for additional instructions (for Atomikos versions 2.10, 3.0.1).
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There is more documentation available from the Atomikos site on using their DataSources.
Configuration for
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older versions
The sample configurations in this section have been verified against Atomikos 2.10 and 3.0.1, and are provided for legacy purposes. Updated code and more detailed explanations of each section are available above.
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