Debugging spark java application

Hello experts, Is there an easy way to debug a spark java application? I'm putting debug logs in the map's function but there aren't any logs on the console. Also can i include my custom jars while launching spark-shell and do my poc there? This might me a naive question but any help here is

Re: Debugging spark java application

For debugging you can refer these two threads http://apache-spark-user-list.1001560.n3.nabble.com/How-do-you-hit-breakpoints-using-IntelliJ-In-functions-used-by-an-RDD-td12754.html