How to configure & package a simple Java app to use JPA

I'm trying to learn JPA and I want create a simple Java command line app that will use JPA to query and update a database table. I mapped out the the simple code needed to do this. But I don't know how to configure the directory structure, where to place the persistence.xml file, packaging and so on. This is just a quick and dirty learning exercise so I want to keep this as simple as possible. Can someone spell out the steps in order to do this? I'm using Weblogic 10.3.
You really have to pick one from "simple Java command line app" and "using Weblogic"

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