NullPointerException while all values are non null
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in my class init a property is set to the value of a parameter. Neither the parameter nor its property is null but there is a null pointer exception
init {
creationDate = owner.network.currentDate
}
you can try it online here
Exception in thread "main" java.lang.NullPointerException
at Vault.<init>(Vault.kt:13)
at NetworkProductionVault.<init>(Vault.kt:65)
at Snc_tokenKt.main(snc-token.kt:13)
kotlin
asked Nov 22 at 16:56
Dr Gorb
2,74812141
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up vote
0
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in my class init a property is set to the value of a parameter. Neither the parameter nor its property is null but there is a null pointer exception
init {
creationDate = owner.network.currentDate
}
you can try it online here
Exception in thread "main" java.lang.NullPointerException
at Vault.<init>(Vault.kt:13)
at NetworkProductionVault.<init>(Vault.kt:65)
at Snc_tokenKt.main(snc-token.kt:13)
kotlin
asked Nov 22 at 16:56
Dr Gorb
2,74812141
1
pls, create a minimal working example that reproduces the given problem, this is not a code review or debugging site.
– Willi Mentzel
Nov 22 at 17:12
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
in my class init a property is set to the value of a parameter. Neither the parameter nor its property is null but there is a null pointer exception
init {
creationDate = owner.network.currentDate
}
you can try it online here
Exception in thread "main" java.lang.NullPointerException
at Vault.<init>(Vault.kt:13)
at NetworkProductionVault.<init>(Vault.kt:65)
at Snc_tokenKt.main(snc-token.kt:13)
kotlin
asked Nov 22 at 16:56
Dr Gorb
2,74812141
in my class init a property is set to the value of a parameter. Neither the parameter nor its property is null but there is a null pointer exception
init {
creationDate = owner.network.currentDate
}
you can try it online here
Exception in thread "main" java.lang.NullPointerException
at Vault.<init>(Vault.kt:13)
at NetworkProductionVault.<init>(Vault.kt:65)
at Snc_tokenKt.main(snc-token.kt:13)
kotlin
kotlin
asked Nov 22 at 16:56
Dr Gorb
2,74812141
asked Nov 22 at 16:56
Dr Gorb
2,74812141
asked Nov 22 at 16:56
Dr Gorb
2,74812141
asked Nov 22 at 16:56
Dr Gorb
2,74812141
asked Nov 22 at 16:56
Dr Gorb
2,74812141
2,74812141
1
pls, create a minimal working example that reproduces the given problem, this is not a code review or debugging site.
– Willi Mentzel
Nov 22 at 17:12
add a comment |
1
pls, create a minimal working example that reproduces the given problem, this is not a code review or debugging site.
– Willi Mentzel
Nov 22 at 17:12
1
1
pls, create a minimal working example that reproduces the given problem, this is not a code review or debugging site.
– Willi Mentzel
Nov 22 at 17:12
pls, create a minimal working example that reproduces the given problem, this is not a code review or debugging site.
– Willi Mentzel
Nov 22 at 17:12
add a comment |
1 Answer
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3
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I added this to init in Vault.kt in your example:
if (owner == null) println("owner is null")
And it is indeed null.
I think the reason is because you've declared this property (owner) as open, but you're referring to it when initializing the superclass. So it's going to be null at that point because the superclass will try to get the value from the subclass, but the subclass won't have been initialized yet. This is explained in a bit more detail here.
answered Nov 22 at 17:09
Yoni Gibbs
908112
add a comment |
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1 Answer
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active
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1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
3
down vote
accepted
I added this to init in Vault.kt in your example:
if (owner == null) println("owner is null")
And it is indeed null.
I think the reason is because you've declared this property (owner) as open, but you're referring to it when initializing the superclass. So it's going to be null at that point because the superclass will try to get the value from the subclass, but the subclass won't have been initialized yet. This is explained in a bit more detail here.
answered Nov 22 at 17:09
Yoni Gibbs
908112
add a comment |
up vote
3
down vote
accepted
I added this to init in Vault.kt in your example:
if (owner == null) println("owner is null")
And it is indeed null.
I think the reason is because you've declared this property (owner) as open, but you're referring to it when initializing the superclass. So it's going to be null at that point because the superclass will try to get the value from the subclass, but the subclass won't have been initialized yet. This is explained in a bit more detail here.
answered Nov 22 at 17:09
Yoni Gibbs
908112
add a comment |
up vote
3
down vote
accepted
up vote
3
down vote
accepted
I added this to init in Vault.kt in your example:
if (owner == null) println("owner is null")
And it is indeed null.
I think the reason is because you've declared this property (owner) as open, but you're referring to it when initializing the superclass. So it's going to be null at that point because the superclass will try to get the value from the subclass, but the subclass won't have been initialized yet. This is explained in a bit more detail here.
answered Nov 22 at 17:09
Yoni Gibbs
908112
I added this to init in Vault.kt in your example:
if (owner == null) println("owner is null")
And it is indeed null.
I think the reason is because you've declared this property (owner) as open, but you're referring to it when initializing the superclass. So it's going to be null at that point because the superclass will try to get the value from the subclass, but the subclass won't have been initialized yet. This is explained in a bit more detail here.
answered Nov 22 at 17:09
Yoni Gibbs
908112
answered Nov 22 at 17:09
Yoni Gibbs
908112
answered Nov 22 at 17:09
Yoni Gibbs
908112
answered Nov 22 at 17:09
Yoni Gibbs
908112
908112
add a comment |
add a comment |
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pls, create a minimal working example that reproduces the given problem, this is not a code review or debugging site.
– Willi Mentzel
Nov 22 at 17:12