How do I join a list in Groovy (in SmartThings state object)?

Asked Oct 28 '17 at 17:34

Active Oct 28 '17 at 17:34

Viewed 54 times

This is for a Samsung SmartThings smart app. I've never used Groovy outside of this context, so I'm not sure if this is a quirk of SmartThings or Groovy. It seems that the following should work, but I keep getting a runtime error:

def initialize() {
    state.ALL_MODES = ['standby', 'home', 'away']
    state.ALL_MODES_STR = state.All_MODES.join(", ")
}

I get the following error in the SmartThings IDE simulator:

java.lang.NullPointerException: Cannot invoke method join() on null object

I am able to output state.ALL_MODES just fine, but when I attempt to join() it, I get this error. What am I missing here?

asked Oct 28 '17 at 17:34

Matt

are you able to output `state.ALL_MODES` inside `initialize` method? – daggett Oct 28 '17 at 18:17
@Matt, where and how state is defined? – Tidhar Klein Orbach Oct 29 '17 at 07:06
The join method is correct. Try state.ALL_MODES_STR = state?.All_MODES.join(", ") the ? will suppress the NullPointerException. Your state variable is probably not initialized yet. Can you share the documentation or example you are using to write this? – Jason Heithoff Oct 30 '17 at 12:51

How do I join a list in Groovy (in SmartThings state object)?

0 Answers0