Charles, I wasn't sure we had an example extension that included a primitive that accepts a task as input, but I found one: Nicolas Payette's `rnd` extension. Looking at his code and test cases was helpful.
So what's happening is you're getting an ArrayIndexOutOfBoundsException, and the "2" is the message in that exception. (We can blame the terse/unhelpful error message on Sun/Oracle; sure would be nice if it said what array and how big...) One way to proceed would be to catch that exception and then throw an ExtensionException. But I wouldn't actually suggest that approach because an ArrayIndexOutOfBoundsException might have a different cause, so you couldn't be confident you'd be issuing a correct error message. So I would suggest handling it the way I see that Nicolas did, which is to do your own arity checking before calling `report` on the ReporterTask. Here's the relevant parts of Nicolas's code: https://github.com/NetLogo/Rnd-Extension/blob/bab4899e2f5ccc7281c4476056e4ff9463c59258/src/main/scala/org/nlogo/extensions/rnd/Primitives.scala#L40-L42 https://github.com/NetLogo/Rnd-Extension/blob/bab4899e2f5ccc7281c4476056e4ff9463c59258/tests.txt#L183-L188 Note that the arity checking unfortunately requires downcasting from `api.Task` to `nvm.Task`. I just opened https://github.com/NetLogo/NetLogo/issues/554 on that (and on the lack of documentation on the need to arity check at all). Note also this similar code in the implementation of the `_runresult` primitive: https://github.com/NetLogo/NetLogo/blob/f6d990160aef29e1928fc7faa986ae7552541504/src/main/org/nlogo/prim/etc/_runresult.scala#L44-L46 but Nicolas didn't call `missingInputs` in his code because of https://github.com/NetLogo/NetLogo/issues/419 . I hope this clears everything up? -- Seth Tisue | Northwestern University | http://tisue.net developer, NetLogo: http://ccl.northwestern.edu/netlogo/ -- You received this message because you are subscribed to the Google Groups "netlogo-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to netlogo-devel+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
