How to prepare and edit

The repository is the project folder for Eclipse. I run Eclipse Neon over Java 8. After cloning, simply import the project.

With the JPA addition, there are a couple more steps (these are more-or-less from memory, so they may not be 100% accurate):

1. Ensure that you are using Eclipse Enterprise Edition, as it comes pre-built with JPA and similar stuffs.
2. Right-click on the imported project, select properties. Under "Project Facets", ensure that JPA is checked. You may or may not need to install some stuff when it becomes enabled.
3. Right-click on the imported project, select properties. Ensure that there is a JPA tab (as installed/enabled in step 2) and that it is using a valid EclipseLink library (mine is using 2.5.2). In addition, a connection is needed for your workspace Derby database. This can be created in the same window, using YTDownloader->Properties->JPA->Connection->"Add connection...". The name of the connection should be "Derby", use "Derby Embedded JDBC Driver" (which you will need to install separately - the JAR is located under YTDownloader\resources\derby.jar). If you have to choose Schema anywhere along this process, use "APP". I arbitrarily picked that, and it works. The location of the DB is pretty arbitrary as well. Here are my connection parameters:
   URL: jdbc:derby:C:\Users\MYUSERNAME\Desktop\workspace\YTDownloader\db\Derby;create=true

If you have any questions, feel free to contact me. This is in no way a perfect set of instructions, and I understand that.