custom interceptor, where to put java code?

[Rod Widdowson]

> 1) in edit-webapp, can I just create a src folder to put in the java?
No
> 2) is there somewhere that I can define my jar dependencies or do i just throw the jars into edit-webapp/WEB-INF/lib?
Yes

> 3) How do I define the flows/intercept/customcheck/customcheck-beans.xml to call MyCustomCheck.doSomeCheck() 
> and pass the returned boolean value to my customcheck-flow.xml to process the decision-state block?

If you are asking how to control whether to apply your flow or not the answer is to control it with an Activation Condition

https://wiki.shibboleth.net/confluence/display/IDP30/ProfileHandling#ProfileHandling-AuthoringandEnablingIntercepts