java using Oracle Backend - Typical Use Patterns?

I'm a java web developer and I'm learning 10g in order to consult in Oracle-based shops. After reading much of the Oracle documentation, What I need to learn depends somewhat on how Oracle is being applied. I'd like to hear this group's perceptions of what are typical practices (if they do exist). For example, where is the business logic typically implemented? One way is to implement Oracle object types and use PL/SQL to implement the methods. Another way would be to keep the business classes in Java classes and use SQLJ inside Oracle. How much new work is being done with object types versus relational tables? If you DBAs had your choice of an application developer, what skills/knowledge do you want him to come in the door with?

Thanks

Lee

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