Debugging my user manager in JDeveloper

[atetrault]

I use JDeveloper 9.0.5.2. For its user manager, my application uses
com.evermind.sql.DataSourceUserManager. Everything works great and has
for years. Now I want to make a minor change to the behavior of
DataSourceUserManager. I have created com.myApp.myTestUserManager,
which is a subclass of DataSourceUserManager.
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How can I get the embedded OC4J to use myTestUserManager so that I can
develop and debug it?
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(Please note that I do not have the option of switching to another
user manager like a JAZN XML or LDAP based user manager.)
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Thank you very much.
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atetrault (at) comcast (dot) net