The selected Oracle database is not configured to use the AL32UTF8 character set. Oracle strongly recommends using the AL32UTF8 character set for databases that support Oracle Fusion Middleware.

Oracle SOA 12C RCU failed with below error!!!

Solution
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When you install Oracle 12C Database, in the "Global Database Creation" Screen there is a check box at the bottom of the screen which says the "Create a Container Database", you would need to uncheck that checkbox and select "AL32UTF8 " as the database encoding style. It worked for me.