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Is the database up and running when you started weblogic server?
Weblogic server executes default SQL "SELECT 1 FROM DUAL " to test the connectivity to Database configured in Weblogic Server data sources and to initialize the connections and to add it to the Connection Pool.
You may see the errors if weblogic is unable to initialize the connections or unable to connect to DB to execute the default SQL Statement.
Please check and revert back.