Kotlin array initialization throws null pointer exception
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1
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I'm a total beginner with kotlin, and I'm trying to initialize an array using the constructor that accepts a size and a function. This is what I have:
fun main(args: Array<String>)
var ary = Array(5, x -> x + 2)
println(ary[2])
But it's throwing a null pointer exception on the first line. Why is this happening?
EDIT: I'm the original poster's professor, and we're trying to get this working together. Here's some more info:
I've edit the code above to be the full program. The version of Kotlin we have installed on our server is:
$ kotlinc -version
info: kotlinc-jvm 1.2.70 (JRE 1.8.0_144-jdk_2017_08_24_20_46-b00)
When I try to compile and run from the command line I get:
$ kotlinc example.kt -include-runtime -d example.jar
$ java -jar example.jar
Exception in thread "main" java.lang.NullPointerException
at ExampleKt.main(example.kt:2)
I'll note that this code compiles just fine for me on my laptop, which has an older version of Kotlin.
kotlin
edited Oct 23 at 18:30
Tom
29627
asked Oct 23 at 2:23
John H
62
|
show 2 more comments
up vote
1
down vote
favorite
I'm a total beginner with kotlin, and I'm trying to initialize an array using the constructor that accepts a size and a function. This is what I have:
fun main(args: Array<String>)
var ary = Array(5, x -> x + 2)
println(ary[2])
But it's throwing a null pointer exception on the first line. Why is this happening?
EDIT: I'm the original poster's professor, and we're trying to get this working together. Here's some more info:
I've edit the code above to be the full program. The version of Kotlin we have installed on our server is:
$ kotlinc -version
info: kotlinc-jvm 1.2.70 (JRE 1.8.0_144-jdk_2017_08_24_20_46-b00)
When I try to compile and run from the command line I get:
$ kotlinc example.kt -include-runtime -d example.jar
$ java -jar example.jar
Exception in thread "main" java.lang.NullPointerException
at ExampleKt.main(example.kt:2)
I'll note that this code compiles just fine for me on my laptop, which has an older version of Kotlin.
kotlin
edited Oct 23 at 18:30
Tom
29627
asked Oct 23 at 2:23
John H
62
8
Code works fine as is and prints out4.
– Robby Cornelissen
Oct 23 at 2:27
The code has no problem. How about uploading the IDE screenshot with NPE.
– Naetmul
Oct 23 at 3:52
If you have an exception it might be worth adding the stacktrace to the question as well. Usually this gives you more information about the why the error happend.
– tynn
Oct 23 at 6:41
1
I tried that, got the exact same error
– John H
Oct 24 at 7:20
1
Same problem as stackoverflow.com/questions/53233325/…
– yole
Nov 17 at 17:39
|
show 2 more comments
up vote
1
down vote
favorite
up vote
1
down vote
favorite
I'm a total beginner with kotlin, and I'm trying to initialize an array using the constructor that accepts a size and a function. This is what I have:
fun main(args: Array<String>)
var ary = Array(5, x -> x + 2)
println(ary[2])
But it's throwing a null pointer exception on the first line. Why is this happening?
EDIT: I'm the original poster's professor, and we're trying to get this working together. Here's some more info:
I've edit the code above to be the full program. The version of Kotlin we have installed on our server is:
$ kotlinc -version
info: kotlinc-jvm 1.2.70 (JRE 1.8.0_144-jdk_2017_08_24_20_46-b00)
When I try to compile and run from the command line I get:
$ kotlinc example.kt -include-runtime -d example.jar
$ java -jar example.jar
Exception in thread "main" java.lang.NullPointerException
at ExampleKt.main(example.kt:2)
I'll note that this code compiles just fine for me on my laptop, which has an older version of Kotlin.
kotlin
edited Oct 23 at 18:30
Tom
29627
asked Oct 23 at 2:23
John H
62
I'm a total beginner with kotlin, and I'm trying to initialize an array using the constructor that accepts a size and a function. This is what I have:
fun main(args: Array<String>)
var ary = Array(5, x -> x + 2)
println(ary[2])
But it's throwing a null pointer exception on the first line. Why is this happening?
EDIT: I'm the original poster's professor, and we're trying to get this working together. Here's some more info:
I've edit the code above to be the full program. The version of Kotlin we have installed on our server is:
$ kotlinc -version
info: kotlinc-jvm 1.2.70 (JRE 1.8.0_144-jdk_2017_08_24_20_46-b00)
When I try to compile and run from the command line I get:
$ kotlinc example.kt -include-runtime -d example.jar
$ java -jar example.jar
Exception in thread "main" java.lang.NullPointerException
at ExampleKt.main(example.kt:2)
I'll note that this code compiles just fine for me on my laptop, which has an older version of Kotlin.
kotlin
kotlin
edited Oct 23 at 18:30
Tom
29627
asked Oct 23 at 2:23
John H
62
edited Oct 23 at 18:30
Tom
29627
asked Oct 23 at 2:23
John H
62
edited Oct 23 at 18:30
Tom
29627
edited Oct 23 at 18:30
Tom
29627
edited Oct 23 at 18:30
Tom
29627
29627
asked Oct 23 at 2:23
John H
62
asked Oct 23 at 2:23
John H
62
asked Oct 23 at 2:23
John H
62
62
8
Code works fine as is and prints out4.
– Robby Cornelissen
Oct 23 at 2:27
The code has no problem. How about uploading the IDE screenshot with NPE.
– Naetmul
Oct 23 at 3:52
If you have an exception it might be worth adding the stacktrace to the question as well. Usually this gives you more information about the why the error happend.
– tynn
Oct 23 at 6:41
1
I tried that, got the exact same error
– John H
Oct 24 at 7:20
1
Same problem as stackoverflow.com/questions/53233325/…
– yole
Nov 17 at 17:39
|
show 2 more comments
8
Code works fine as is and prints out4.
– Robby Cornelissen
Oct 23 at 2:27
The code has no problem. How about uploading the IDE screenshot with NPE.
– Naetmul
Oct 23 at 3:52
If you have an exception it might be worth adding the stacktrace to the question as well. Usually this gives you more information about the why the error happend.
– tynn
Oct 23 at 6:41
1
I tried that, got the exact same error
– John H
Oct 24 at 7:20
1
Same problem as stackoverflow.com/questions/53233325/…
– yole
Nov 17 at 17:39
8
8
Code works fine as is and prints out
4.– Robby Cornelissen
Oct 23 at 2:27
Code works fine as is and prints out
4.– Robby Cornelissen
Oct 23 at 2:27
The code has no problem. How about uploading the IDE screenshot with NPE.
– Naetmul
Oct 23 at 3:52
The code has no problem. How about uploading the IDE screenshot with NPE.
– Naetmul
Oct 23 at 3:52
If you have an exception it might be worth adding the stacktrace to the question as well. Usually this gives you more information about the why the error happend.
– tynn
Oct 23 at 6:41
If you have an exception it might be worth adding the stacktrace to the question as well. Usually this gives you more information about the why the error happend.
– tynn
Oct 23 at 6:41
1
1
I tried that, got the exact same error
– John H
Oct 24 at 7:20
I tried that, got the exact same error
– John H
Oct 24 at 7:20
1
1
Same problem as stackoverflow.com/questions/53233325/…
– yole
Nov 17 at 17:39
Same problem as stackoverflow.com/questions/53233325/…
– yole
Nov 17 at 17:39
|
show 2 more comments
1 Answer
1
active
oldest
votes
up vote
5
down vote
This is a bug in the AOT-compiled (OS-dependent) version of the Kotlin compiler. Please see the issue for updates.
answered Nov 19 at 10:03
yole
57.1k11139138
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
5
down vote
This is a bug in the AOT-compiled (OS-dependent) version of the Kotlin compiler. Please see the issue for updates.
answered Nov 19 at 10:03
yole
57.1k11139138
add a comment |
up vote
5
down vote
This is a bug in the AOT-compiled (OS-dependent) version of the Kotlin compiler. Please see the issue for updates.
answered Nov 19 at 10:03
yole
57.1k11139138
add a comment |
up vote
5
down vote
up vote
5
down vote
This is a bug in the AOT-compiled (OS-dependent) version of the Kotlin compiler. Please see the issue for updates.
answered Nov 19 at 10:03
yole
57.1k11139138
This is a bug in the AOT-compiled (OS-dependent) version of the Kotlin compiler. Please see the issue for updates.
answered Nov 19 at 10:03
yole
57.1k11139138
answered Nov 19 at 10:03
yole
57.1k11139138
answered Nov 19 at 10:03
yole
57.1k11139138
answered Nov 19 at 10:03
yole
57.1k11139138
57.1k11139138
add a comment |
add a comment |
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8
Code works fine as is and prints out
4.– Robby Cornelissen
Oct 23 at 2:27
The code has no problem. How about uploading the IDE screenshot with NPE.
– Naetmul
Oct 23 at 3:52
If you have an exception it might be worth adding the stacktrace to the question as well. Usually this gives you more information about the why the error happend.
– tynn
Oct 23 at 6:41
1
I tried that, got the exact same error
– John H
Oct 24 at 7:20
1
Same problem as stackoverflow.com/questions/53233325/…
– yole
Nov 17 at 17:39