Recently I had the issue one Oracle SOA DbAdapter instance in the cluster environment. The DbAdapter is created in the single node development environment. Everything is working fine but after moving to testing environment which is cluster environment. DbAdapter is created following the same steps as did for development environment. Things start to go wrong sometimes. The faults occurred complains that
the Resource Adapters RAR file has not been deployed successfully to the WebLogic Application server or
element in weblogic-ra.xml has not been set to the created DbApater instance. However the DbApater instance looks completely correct from Weblogic Console. After some while of investigation it is realized that it might be the resource adapter plan file is not set up correctly in both nodes or one of node. Checking the Plan.xml files on each node verifies this. After copying the Plan which is set correctly to another node everything starts to work fine.
There is one wonderful blog which explains this very clearly.
http://myexperienceswithsoa.blogspot.com.au/2012/02/planxml-not-getting-updated-across.html
So next time when you are working with resource adapter in cluster environment keep this in mind.
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