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How to call java method taking parameter as List> from Scala
How do I use reflection to call a generic method?How do I call one constructor from another in Java?How do I create a Java string from the contents of a file?How do I address unchecked cast warnings?How to get an enum value from a string value in Java?Efficiency of Java “Double Brace Initialization”?Where does Scala look for implicits?How to convert a java.util.List to a Scala listTranslating generic wildcards from Java to ScalaPlay! failing to convert java list to scala list
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I am trying to call a java method which takes List<Class<?>> from scala.
The compilation fails with
type mismatch;
found : java.util.List[Class[T]] where type T <: Person.type
required: java.util.List[Class[_]]
I tried using JavaConverters but get the same error.
Java method:
void registerClasses(List<Class<?>> var1);
Calling from Scala:
def registerEntities() = registry.registerClasses(List(Person.getClass).asJava)
java scala generics
edited Mar 24 at 7:55
pme
4,11511935
asked Mar 24 at 3:50
soopersooper
233
add a comment |
I am trying to call a java method which takes List<Class<?>> from scala.
The compilation fails with
type mismatch;
found : java.util.List[Class[T]] where type T <: Person.type
required: java.util.List[Class[_]]
I tried using JavaConverters but get the same error.
Java method:
void registerClasses(List<Class<?>> var1);
Calling from Scala:
def registerEntities() = registry.registerClasses(List(Person.getClass).asJava)
java scala generics
edited Mar 24 at 7:55
pme
4,11511935
asked Mar 24 at 3:50
soopersooper
233
Not a solution, but what happens when you change the Java side to use a raw type, so just List var1)?
– GhostCat
Mar 24 at 4:59
@GhostCat - Java side is a third party library. So, can't really change it.
– sooper
Mar 24 at 5:12
add a comment |
I am trying to call a java method which takes List<Class<?>> from scala.
The compilation fails with
type mismatch;
found : java.util.List[Class[T]] where type T <: Person.type
required: java.util.List[Class[_]]
I tried using JavaConverters but get the same error.
Java method:
void registerClasses(List<Class<?>> var1);
Calling from Scala:
def registerEntities() = registry.registerClasses(List(Person.getClass).asJava)
java scala generics
edited Mar 24 at 7:55
pme
4,11511935
asked Mar 24 at 3:50
soopersooper
233
I am trying to call a java method which takes List<Class<?>> from scala.
The compilation fails with
type mismatch;
found : java.util.List[Class[T]] where type T <: Person.type
required: java.util.List[Class[_]]
I tried using JavaConverters but get the same error.
Java method:
void registerClasses(List<Class<?>> var1);
Calling from Scala:
def registerEntities() = registry.registerClasses(List(Person.getClass).asJava)
java scala generics
java scala generics
edited Mar 24 at 7:55
pme
4,11511935
asked Mar 24 at 3:50
soopersooper
233
edited Mar 24 at 7:55
pme
4,11511935
asked Mar 24 at 3:50
soopersooper
233
edited Mar 24 at 7:55
pme
4,11511935
edited Mar 24 at 7:55
pme
4,11511935
edited Mar 24 at 7:55
pme
4,11511935
4,11511935
asked Mar 24 at 3:50
soopersooper
233
asked Mar 24 at 3:50
soopersooper
233
asked Mar 24 at 3:50
soopersooper
233
233
Not a solution, but what happens when you change the Java side to use a raw type, so just List var1)?
– GhostCat
Mar 24 at 4:59
@GhostCat - Java side is a third party library. So, can't really change it.
– sooper
Mar 24 at 5:12
add a comment |
Not a solution, but what happens when you change the Java side to use a raw type, so just List var1)?
– GhostCat
Mar 24 at 4:59
@GhostCat - Java side is a third party library. So, can't really change it.
– sooper
Mar 24 at 5:12
Not a solution, but what happens when you change the Java side to use a raw type, so just List var1)?
– GhostCat
Mar 24 at 4:59
Not a solution, but what happens when you change the Java side to use a raw type, so just List var1)?
– GhostCat
Mar 24 at 4:59
@GhostCat - Java side is a third party library. So, can't really change it.
– sooper
Mar 24 at 5:12
@GhostCat - Java side is a third party library. So, can't really change it.
– sooper
Mar 24 at 5:12
add a comment |
1 Answer
1
active
oldest
votes
The problem is that the inferred type for Person.getClass is not the one you want. You need to specify the expected type, and this can be done by an explicit type parameter
registry.registerClasses(List[Class[_]](Person.getClass).asJava)
(I don't understand why type ascription doesn't work here:
registerClasses(List(Person.getClass: Class[_]).asJava)
type mismatch;
found : java.util.List[Class[_$2]] where type _$2
required: java.util.List[Class[_]]
Note: Class[_$2] <: Class[_], but Java-defined trait List is invariant in type E.
You may wish to investigate a wildcard type such as `_ <: Class[_]`. (SLS 3.2.10)
So far as I can tell it should.)
answered Mar 24 at 6:20
Alexey RomanovAlexey Romanov
113k26218363
2
I can't get the type ascription to work, but it seems the type parameter works, so +1.
– Brian McCutchon
Mar 24 at 6:43
@BrianMcCutchon That's really surprising, thanks.
– Alexey Romanov
Mar 24 at 7:16
@Alexey Romanov - Thanks. Type parameter works. However, it puzzles me why implicit conversion doesn't. IntelliJ doesn't complain but maven compilation fails.
– sooper
Mar 25 at 0:57
add a comment |
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1 Answer
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1 Answer
1
active
oldest
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active
oldest
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active
oldest
votes
The problem is that the inferred type for Person.getClass is not the one you want. You need to specify the expected type, and this can be done by an explicit type parameter
registry.registerClasses(List[Class[_]](Person.getClass).asJava)
(I don't understand why type ascription doesn't work here:
registerClasses(List(Person.getClass: Class[_]).asJava)
type mismatch;
found : java.util.List[Class[_$2]] where type _$2
required: java.util.List[Class[_]]
Note: Class[_$2] <: Class[_], but Java-defined trait List is invariant in type E.
You may wish to investigate a wildcard type such as `_ <: Class[_]`. (SLS 3.2.10)
So far as I can tell it should.)
answered Mar 24 at 6:20
Alexey RomanovAlexey Romanov
113k26218363
2
I can't get the type ascription to work, but it seems the type parameter works, so +1.
– Brian McCutchon
Mar 24 at 6:43
@BrianMcCutchon That's really surprising, thanks.
– Alexey Romanov
Mar 24 at 7:16
@Alexey Romanov - Thanks. Type parameter works. However, it puzzles me why implicit conversion doesn't. IntelliJ doesn't complain but maven compilation fails.
– sooper
Mar 25 at 0:57
add a comment |
The problem is that the inferred type for Person.getClass is not the one you want. You need to specify the expected type, and this can be done by an explicit type parameter
registry.registerClasses(List[Class[_]](Person.getClass).asJava)
(I don't understand why type ascription doesn't work here:
registerClasses(List(Person.getClass: Class[_]).asJava)
type mismatch;
found : java.util.List[Class[_$2]] where type _$2
required: java.util.List[Class[_]]
Note: Class[_$2] <: Class[_], but Java-defined trait List is invariant in type E.
You may wish to investigate a wildcard type such as `_ <: Class[_]`. (SLS 3.2.10)
So far as I can tell it should.)
answered Mar 24 at 6:20
Alexey RomanovAlexey Romanov
113k26218363
2
I can't get the type ascription to work, but it seems the type parameter works, so +1.
– Brian McCutchon
Mar 24 at 6:43
@BrianMcCutchon That's really surprising, thanks.
– Alexey Romanov
Mar 24 at 7:16
@Alexey Romanov - Thanks. Type parameter works. However, it puzzles me why implicit conversion doesn't. IntelliJ doesn't complain but maven compilation fails.
– sooper
Mar 25 at 0:57
add a comment |
The problem is that the inferred type for Person.getClass is not the one you want. You need to specify the expected type, and this can be done by an explicit type parameter
registry.registerClasses(List[Class[_]](Person.getClass).asJava)
(I don't understand why type ascription doesn't work here:
registerClasses(List(Person.getClass: Class[_]).asJava)
type mismatch;
found : java.util.List[Class[_$2]] where type _$2
required: java.util.List[Class[_]]
Note: Class[_$2] <: Class[_], but Java-defined trait List is invariant in type E.
You may wish to investigate a wildcard type such as `_ <: Class[_]`. (SLS 3.2.10)
So far as I can tell it should.)
answered Mar 24 at 6:20
Alexey RomanovAlexey Romanov
113k26218363
The problem is that the inferred type for Person.getClass is not the one you want. You need to specify the expected type, and this can be done by an explicit type parameter
registry.registerClasses(List[Class[_]](Person.getClass).asJava)
(I don't understand why type ascription doesn't work here:
registerClasses(List(Person.getClass: Class[_]).asJava)
type mismatch;
found : java.util.List[Class[_$2]] where type _$2
required: java.util.List[Class[_]]
Note: Class[_$2] <: Class[_], but Java-defined trait List is invariant in type E.
You may wish to investigate a wildcard type such as `_ <: Class[_]`. (SLS 3.2.10)
So far as I can tell it should.)
answered Mar 24 at 6:20
Alexey RomanovAlexey Romanov
113k26218363
edited Mar 24 at 7:15
answered Mar 24 at 6:20
Alexey RomanovAlexey Romanov
113k26218363
answered Mar 24 at 6:20
Alexey RomanovAlexey Romanov
113k26218363
answered Mar 24 at 6:20
Alexey RomanovAlexey Romanov
113k26218363
113k26218363
2
I can't get the type ascription to work, but it seems the type parameter works, so +1.
– Brian McCutchon
Mar 24 at 6:43
@BrianMcCutchon That's really surprising, thanks.
– Alexey Romanov
Mar 24 at 7:16
@Alexey Romanov - Thanks. Type parameter works. However, it puzzles me why implicit conversion doesn't. IntelliJ doesn't complain but maven compilation fails.
– sooper
Mar 25 at 0:57
add a comment |
2
I can't get the type ascription to work, but it seems the type parameter works, so +1.
– Brian McCutchon
Mar 24 at 6:43
@BrianMcCutchon That's really surprising, thanks.
– Alexey Romanov
Mar 24 at 7:16
@Alexey Romanov - Thanks. Type parameter works. However, it puzzles me why implicit conversion doesn't. IntelliJ doesn't complain but maven compilation fails.
– sooper
Mar 25 at 0:57
2
2
I can't get the type ascription to work, but it seems the type parameter works, so +1.
– Brian McCutchon
Mar 24 at 6:43
I can't get the type ascription to work, but it seems the type parameter works, so +1.
– Brian McCutchon
Mar 24 at 6:43
@BrianMcCutchon That's really surprising, thanks.
– Alexey Romanov
Mar 24 at 7:16
@BrianMcCutchon That's really surprising, thanks.
– Alexey Romanov
Mar 24 at 7:16
@Alexey Romanov - Thanks. Type parameter works. However, it puzzles me why implicit conversion doesn't. IntelliJ doesn't complain but maven compilation fails.
– sooper
Mar 25 at 0:57
@Alexey Romanov - Thanks. Type parameter works. However, it puzzles me why implicit conversion doesn't. IntelliJ doesn't complain but maven compilation fails.
– sooper
Mar 25 at 0:57
add a comment |
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Not a solution, but what happens when you change the Java side to use a raw type, so just List var1)?
– GhostCat
Mar 24 at 4:59
@GhostCat - Java side is a third party library. So, can't really change it.
– sooper
Mar 24 at 5:12