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Questions tagged [java-interop]

44 questions
21
votes
2 answers

What's the intended use of @JvmSynthetic in Kotlin?

I have come across the @JvmSynthetic annotation in kotlin-stdlib, and I'm wondering what it is for, but, unfortunately, it is undocumented. (UPD: it was at that moment) As far as I understand, applying it to a program element will add the synthetic…
hotkey
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21
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3 answers

Does Clojure have an equivalent of Java's import package.*?

Or do I have to specifically enumerate every class that I import? I'm just learning Clojure now, and it seems useful to be able to do something like this in the REPL: (import '(java.io *)) Not that this is valid syntax, but it would be nice to…
Jeff
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12
votes
3 answers

Convert static windows library to dll

I have a library contains a bunch of static *lib files, I wish to access them from JNA (a Java library that allows one to dynamically call `dll's from JAVA Code), so is there a way to magically change static lib to dll? Code was compiled using…
jb.
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11
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2 answers

Add constructor to deftype created class

For the purposes of interoperability with Java, I need a class that has a nullary constructor that performs initialization. Objects of this class need to have something resembling mutable java fields (namely, the object represents the backend of a…
Alex R
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11
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3 answers

Kotlin method overloading

This following declaration is legal in Kotlin. fun foo(): String = "foo_1" fun foo(): T = "foo_2" as T As bytecode we are getting: public final static foo()Ljava/lang/String; // signature ()TT; // declaration: T…
Sergei Rybalkin
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10
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2 answers

Changing kotlin extension function receiver JVM name

This is a general question. Let's say I have an extension function written in kotlin which converts DP to PX and return a NonNull Int fun Int.toPx() { /** implementation */ } The function in java will look something like this public int toPx(int…
Gil Goldzweig
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10
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3 answers

How do I invoke a Java method from perl6

use java::util::zip::CRC32:from; my $crc = CRC32.new(); for 'Hello, Java'.encode('utf-8') { $crc.'method/update/(B)V'($_); } say $crc.getValue(); sadly, this does not work Method 'method/update/(B)V' not found for invocant of class…
user7610
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8
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2 answers

clojure gen-class varargs constructor

in the :constructors map and subsequent -init definitions, how do I represent a varargs constructor (assuming the superclass has multiple constructors of which one is varargs) ?
Hendekagon
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7
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1 answer

How can I define a clojure type that implements the servlet interface?

I'm attempting to use deftype (from the bleeding-edge clojure 1.2 branch) to create a java class that implements the java Servlet interface. I would expect the code below to compile (even though it's not very useful). (ns foo [:import…
Rob Lachlan
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7
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3 answers

How do I pull `static final` constants from a Java class into a Clojure namespace?

I am trying to wrap a Java library with a Clojure binding. One particular class in the Java library defines a bunch of static final constants, for example: class Foo { public static final int BAR = 0; public static final int SOME_CONSTANT =…
Joe Holloway
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6
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2 answers

How do you refer to primitive Java types in Clojure?

I'd like to use reflection to get a method of a Java object from Clojure. One of the argument types is a Java primitive and I don't know how to refer to them from Clojure. For example, say I wanted to get String.valueOf(boolean). My nearest guess…
Jeremy
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5
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3 answers

Converting Java collections to Clojure data structures

I am creating a Clojure interface to a Java API with a method that returns a java.util.LinkedHashSet. Firstly, is the idiomatic Clojure way of handling this to convert the LinkedHashSet to a clojure data structure? Secondly, what is the best method…
Toby Hede
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5
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2 answers

Clojure - convert list into Java array

Is there any idiomatic way of converting Clojure list into Java array, other than first converting it to vector and using into-array (means, something other than (into-array (vec my-list)), as I don't want additional overhead)?
Arnthor
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4
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1 answer

Inherited platform declarations clash when extending a Java class in Kotlin

I am trying to extend a third-party Java class with Kotlin but I get this compiler message: Inherited platform declarations clash: The following declarations have the same JVM signature (setCollection(Ljava/util/Collection;)V): fun…
Christian Kaufmann
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3
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1 answer

In Karate, what is the advantage of wrapping a Java function in a JavaScript function?

I can wrap a Java function like this: * def myJavaMethod = """ function() { var Utils = Java.type('Utils'); // use Number type in constructor var obj = new Utils(...); return obj.myJavaMethod(); } """ But why would I? I can use…
user2943111
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