RedditClient

Ok so turns out this was pretty silly. Basically, the classpath listed my dependencies (because of how I set up the pom) but that doesn't mean that it specified the path to those dependencies. In fact, it didn't specify a path at all, so whenever java tried to run the jar, it looked for the dependencies in the current directory. I know that because when I put the dependencies in the same directory as the jar, it worked. The better solution here would be to modify the pom to add a prefix to the classpath so that the java knows where to find the dependencies. Unfortunately, my dependencies are in different places so that's not really an option for me; instead, I'm going to try to find out how to make a fat/uber jar.

Since your first query is working the credentials are correct. In JRAW don't give the whole URL but only the id in the submission function.

Change this

I believe I've found the cause for this. When you're creating your app in Reddit you need to select Script here in this section:

I was debugging JRAW to see what it's doing and when it's building the HTTP request to send to Reddit it's adding a parameter for your applications' type. I don't know if you can somehow configure JRAW to use any of the other types but the default it uses is 'Script'

Edit: More info on different Authentication schemes for JRAW can be found here - https://mattbdean.gitbooks.io/jraw/content/v/v1.1.0/oauth2.html

Optional.of doesn't accept null (it'll throw an exception if it gets one), but use of ?. means submission can be null. Use Optional.ofNullable instead.