NullPointerException while all values are non null
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 '18 at 16:56
Dr GorbDr Gorb
2,77312141
add a comment |
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 '18 at 16:56
Dr GorbDr Gorb
2,77312141
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 '18 at 17:12
add a comment |
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 '18 at 16:56
Dr GorbDr Gorb
2,77312141
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 '18 at 16:56
Dr GorbDr Gorb
2,77312141
asked Nov 22 '18 at 16:56
Dr GorbDr Gorb
2,77312141
asked Nov 22 '18 at 16:56
Dr GorbDr Gorb
2,77312141
asked Nov 22 '18 at 16:56
Dr GorbDr Gorb
2,77312141
asked Nov 22 '18 at 16:56
Dr GorbDr Gorb
2,77312141
2,77312141
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 '18 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 '18 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 '18 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 '18 at 17:12
add a comment |
1 Answer
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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 '18 at 17:09
Yoni GibbsYoni Gibbs
1,213113
add a comment |
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1 Answer
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active
oldest
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oldest
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active
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votes
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 '18 at 17:09
Yoni GibbsYoni Gibbs
1,213113
add a comment |
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 '18 at 17:09
Yoni GibbsYoni Gibbs
1,213113
add a comment |
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 '18 at 17:09
Yoni GibbsYoni Gibbs
1,213113
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 '18 at 17:09
Yoni GibbsYoni Gibbs
1,213113
answered Nov 22 '18 at 17:09
Yoni GibbsYoni Gibbs
1,213113
answered Nov 22 '18 at 17:09
Yoni GibbsYoni Gibbs
1,213113
answered Nov 22 '18 at 17:09
Yoni GibbsYoni Gibbs
1,213113
1,213113
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 '18 at 17:12