Thomas Risberg opened DATAJDBC-74 and commented
"Custom DataSource Connection Preparer" doesn't work with the "Configuration of a Proxy Authentication", when oracle connection is set to a proxy connection all the session level information set by connection preparer is lost.
There should a way that connection preparer is invoked after (over) the Proxy connection, not before
Reference URL: spring-attic/spring-data-jdbc-ext#17