You can also check if it s null when calling the method

Question

davidase · Answer

it s an information dump page where i just list whatever information that is available for an object ``` $msg get PAYMENT DATE $transaction paidDate $msg get PAYMENT METHOD $transaction paidWith $msg get PAYMENT AMOUNT $transaction totalAmountPreVat $transaction currency ``` i don t really care if anything is null

davidase · Answer

i m not really looking for alternate solutions the approach i have currently works well for java

davidase · Answer

i was just wondering if there was a nicer way of writing the function

karelpeeters · Answer

Then what did you mean with varargs can t be null They certainly can if you give them a nullable type like in < menegatti> s example

davidase · Answer

then you ll have to pass an array of nulls you can t pass just a singular null value

karelpeeters · Answer

Can you give some example of how you want this to work ``` get key a b c get key a null get key null a get key null get key get key arrayOf a null get key arrayOf lt String gt ``` All of those would work with the vararg one

davidase · Answer

hmm `get key null ` won t work for me

davidase · Answer

``` fun get key String vararg args Any String return MessageFormat format get key args ``` `Parameter specified as non null is null method util MessageBundle get parameter args`

karelpeeters · Answer

Huh that is strange I wonder if it s intended

davidase · Answer

i made a new project and just ran your snippet there everything works thinking face

karelpeeters · Answer

Do both projects have different compiler versions

davidase · Answer

`get` is being called from apache velocity in my original project

davidase · Answer

not sure why that would matter though

karelpeeters · Answer

Did you actually run the broken one or is that just Idea complaining

davidase · Answer

i ran it

karelpeeters · Answer

Compiler versions

davidase · Answer

``` org apache velocity exception MethodInvocationException Invocation of method get in class util MessageBundle threw exception java lang IllegalArgumentException Parameter specified as non null is null method util MessageBundle get parameter args at velocity views data dump vm line 5 column 41 Caused by java lang IllegalArgumentException Parameter specified as non null is null method util MessageBundle get parameter args ```

karelpeeters · Answer

Right that s just Kotlin s build in runtime null checking complaining

davidase · Answer

why would it complain when calling the function from velocity but not from a `fun main`

davidase · Answer

```kotlin 1 1 2 2 target jvm1 8 javac 1 8 0 101```

benleggiero · Answer

Oh yeah in Java there s no obvious way to distinguish `get key 1 2 3 ` from `get key 1 2 3 ` so in Java `get key null ` is like `get key null ` in Kotlin Assuming the calling code is Java

karelpeeters · Answer

Ah that could be the difference is the calling code Java

davidase · Answer

< benleggiero> thanks does that mean i m stuck with this ``` fun get key String args Array lt Any gt String if args == null return MessageFormat format get key args return MessageFormat format get key args ```

davidase · Answer

< karelpeeters> yes sorry if i failed to make that clear

davidase · Answer

the function is being called from apache velocity a java based template engine

karelpeeters · Answer

You can overload it with a version that takes a single extra parameter and calls the other one

davidase · Answer

thinking face