ScalaRunTime.stringOf(Array(null)) throws NullPointerException

Hello,

I'm debugging JSR-223 support I have found somwhere on the Google Code
Hosting. I found that because of some reason

scala.runtime.ScalaRunTime.stringOf(Array(null)) throws
NullPointerException.

It also means that Array(null).mkString also does NPE.

Is it by design?

Regards,
Mateusz Fiołka

Ah, sorry, I found it in Trac.

http://lampsvn.epfl.ch/trac/scala/ticket/1563

mateusz.f wrote:
>
> Hello,
>
> I'm debugging JSR-223 support I have found somwhere on the Google Code
> Hosting. I found that because of some reason
>
> scala.runtime.ScalaRunTime.stringOf(Array(null)) throws
> NullPointerException.
>
> It also means that Array(null).mkString also does NPE.
>
> Is it by design?
>
> Regards,
> Mateusz Fiołka
>

Still, the ticket is closed 6 weeks ago, and 2.7.3rc2 still has this bug.

mateusz.f wrote:
>
> Ah, sorry, I found it in Trac.
>
>
> http://lampsvn.epfl.ch/trac/scala/ticket/1563
>
>
>
> mateusz.f wrote:
>>
>> Hello,
>>
>> I'm debugging JSR-223 support I have found somwhere on the Google Code
>> Hosting. I found that because of some reason
>>
>> scala.runtime.ScalaRunTime.stringOf(Array(null)) throws
>> NullPointerException.
>>
>> It also means that Array(null).mkString also does NPE.
>>
>> Is it by design?
>>
>> Regards,
>> Mateusz Fiołka
>>
>
>

mateusz.f wrote:
> Still, the ticket is closed 6 weeks ago, and 2.7.3rc2 still has this bug.

Welcome to Scala version 2.7.3.RC2 (Java HotSpot(TM) Server VM, Java
1.5.0_16).
Type in expressions to have them evaluated.
Type :help for more information.

scala> scala.runtime.ScalaRunTime.stringOf(Array(null))
res0: String = Array(null)

scala> val b = Array(null)
b: Array[Null] = Array(null)

scala> println(b.deepToString)
Array(null)

What null pointer exception are you talking about exactly? Ticket 1563
seems quite fixed to me.

Ok, maybe it's not exactly this one:

c:\Program Files\scala-2.7.3.RC2\bin>scala
Welcome to Scala version 2.7.3.RC2 (Java HotSpot(TM) Client VM, Java
1.6.0_10)
Type in expressions to have them evaluated.
Type :help for more information.

scala> Array(null).deepToString
res0: String = Array(null)

scala> Array(null).mkString
java.lang.NullPointerException
at scala.Iterable$$anonfun$mkString$1.apply(Iterable.scala:444)
at scala.Iterable$$anonfun$mkString$1.apply(Iterable.scala:444)
at scala.Iterator$class.foreach(Iterator.scala:414)
at scala.runtime.BoxedArray$AnyIterator.foreach(BoxedArray.scala:45)
at scala.Iterable$class.foreach(Iterable.scala:256)
at scala.runtime.BoxedArray.foreach(BoxedArray.sc...
scala>

Geoffrey Alan Washburn-4 wrote:
>
> mateusz.f wrote:
>> Still, the ticket is closed 6 weeks ago, and 2.7.3rc2 still has this bug.
>
> Welcome to Scala version 2.7.3.RC2 (Java HotSpot(TM) Server VM, Java
> 1.5.0_16).
> Type in expressions to have them evaluated.
> Type :help for more information.
>
> scala> scala.runtime.ScalaRunTime.stringOf(Array(null))
> res0: String = Array(null)
>
> scala> val b = Array(null)
> b: Array[Null] = Array(null)
>
> scala> println(b.deepToString)
> Array(null)
>
>
> What null pointer exception are you talking about exactly? Ticket 1563
> seems quite fixed to me.
>
>
>

mateusz.f wrote:
> Ok, maybe it's not exactly this one:
>
> c:\Program Files\scala-2.7.3.RC2\bin>scala
> Welcome to Scala version 2.7.3.RC2 (Java HotSpot(TM) Client VM, Java
> 1.6.0_10)
> Type in expressions to have them evaluated.
> Type :help for more information.
>
> scala> Array(null).deepToString
> res0: String = Array(null)
>
> scala> Array(null).mkString
> java.lang.NullPointerException
> at scala.Iterable$$anonfun$mkString$1.apply(Iterable.scala:444)
> at scala.Iterable$$anonfun$mkString$1.apply(Iterable.scala:444)
> at scala.Iterator$class.foreach(Iterator.scala:414)
> at scala.runtime.BoxedArray$AnyIterator.foreach(BoxedArray.scala:45)
> at scala.Iterable$class.foreach(Iterable.scala:256)
> at scala.runtime.BoxedArray.foreach(BoxedArray.sc...
> scala>

I fail to see how the problem with mkString is in any way related to
ScalaRunTime.stringOf. Yes, the problem with mkString is probably a
bug, for which a ticket should be filed, but mkString should probably
not be using ScalaRunTime.stringOf. The latter is only intended to be
used in select circumstances and not as a recommended replacement for
the toString method.

Ok, I incorrectly assumed it was a deepString problem.
I searched for mkString tickets on trac and haven't found any match to this
problem.
Thus I have created new ticket.

https://lampsvn.epfl.ch/trac/scala/ticket/1639

Geoffrey Alan Washburn-4 wrote:
>
> I fail to see how the problem with mkString is in any way related to
> ScalaRunTime.stringOf. Yes, the problem with mkString is probably a
> bug, for which a ticket should be filed, but mkString should probably
> not be using ScalaRunTime.stringOf. The latter is only intended to be
> used in select circumstances and not as a recommended replacement for
> the toString method.
>