intellij and scriptrunner

[Tomas Gustavsson]

HI,

I would like to be able to develop scripts via intellij IDEA, i have followed the tutorial and i have successfully set up a connection, but are missing one part,

From the tutorial:
you can also navigate to my.atlassian.com to gain a copy of the source code for your Atlassian product. This is available to anyone with a paid, non-starter license of Atlassian products. When you have downloaded the appropriate source zip, simply extract it on your computer and link this to your IntelliJ project; see the guide on our Setting up a Development Environment page for more detail. You should only have to do this one time. 

This indicates that o do not need to have this connection, and in my case i'm not aloud to, but do i need to? 
Right now i have an issue with e.g 

unable to resolve class com.atlassian.jira.component.ComponentAccessor, in intellij,

I wonder if this can be solved without having the source code?