How to set Oracle NLS_LANG when using JPA

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I am using JPA to access an Oracle database which has its encoding set to ISO-8859-1.

How do I set NLS_LANG using JPA to receive data in the correct encoding?

I suspect it should be set somewhere in the persistence context XML.

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The JDBC driver takes care of everything. It knows what the encoding value is and uses the appropriate encoding without any action on your part.