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Questions tagged [gen-class]

gen-class automatically generates Java classes from Clojure code.

36 questions
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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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1 answer

Clojure multiple constructors using gen-class

How can i define multiple constructors and states using gen-class in clojure? I do not see a way to do this with single valued mappings for :init, :state and :constructors.
FUD
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Clojure gen-class for overloaded and overridden methods

I'm trying to use gen-class to override the compare(WriteableComparable a, WriteableComparable b) method in this class in clojure. The complication comes from the fact that this method is overloaded 3 times: int compare(WritableComparable a,…
dsg
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3 answers

Attaching metadata to a Clojure gen-class

Is it possible to attach metadata to a Clojure gen-class? I am trying to implement a server that uses a library that requires Java annotations added to classes. From Chas Emerick's, et al., forthcoming book "Programming Clojure" (section 9.7.3),…
Ralph
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3 answers

How to compile Java code after Clojure code in leiningen

In my Leiningen project: (defproject com.stackoverflow.clojure/tests "0.1.0-SNAPSHOT" :description "Tests of Clojure test-framework." :url "http://example.com/FIXME" :license {:name "Eclipse Public License" :url…
Edward
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Why can't Leiningen always use my :gen-class properly?

Let's say I create a new Leiningen project (lein new app example) and add some code in example/src/example/core.clj that makes use of :gen-class: (ns example.core (:gen-class :extends javafx.application.Application)) (defn -start [this stage] …
Sam Estep
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How to generate generate static methods with clojure's Gen-class?

In My Clojure-code I'd like to generate a class-file that contains a static method (named staticMethod), which is later on called by in a static context from a Java-program. I tried (Clojure): (ns com.stackoverflow.clojure.testGenClass …
Edward
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1 answer

Can gen-class override a protected Java method?

I'm trying to use Swing from Clojure, and I'm getting confused by gen-class and I can't tell from the documentation if this is supposed to work - paintComponent is a protected method on JPanel, and I'm able to override it, but when I try to call the…
jes5199
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clojure macro using gen-class doesn't create annotations

I'm trying to write a clojure macro that will be used to generate multiple Java classes at compile time. I've found that I can add annotations to a class when I invoke gen-class outside of a macro. However, when I try to use gen-class inside a…
Michael Willis
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gen-class not generating a class

I'm having difficulty referencing classes generated via :gen-class. The smallest example I can show that demonstrates the problem is: (defproject test-proj :dependencies [[org.clojure/clojure "1.8.0"]] :aot [test-proj.test]) (ns…
Carcigenicate
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Problem Extending A Class in Clojure: ClassFormatError: Duplicate field name&signature

I'm trying to extend JButton with Clojure, but I ran into a problem when I try to create my own constructors. Whenever I use :constructors with :gen-class I keep getting a "ClassFormatError: Duplicate field name&signature" message when I try to…
Cristian
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2 answers

What is wrong with my simple Clojure gen-class script?

I'm trying to learn how to use gen-class in Clojure. I've started with this simple script: (gen-class :name MyClass :prefix MyClass-) (defn MyClass-toString[this] "This Is My Class") (println (MyClass.)) When I try to run it I get Exception…
Idan Arye
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How can a static initializer be defined using gen-class

I am generating a Java class from Clojure that implements a JDBC Driver, the problem is that usually JDBC drivers register themselves with the DriverManager in a static initializer like so: public class MyDriver implements java.sql.Driver { ... …
user1181316
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Trouble understanding :state in Clojure

I understand what :state /does/. It creates a field, like in Java, in your class. What I don't understand is what is the point of this? It seems like I only see it done with Clojure-generated classes that extend other classes.…
Rayne
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ClassCastException when returning LazySeq from Clojure to Java

I have Clojure function that returns a LazySeq. When I run this function from the REPL, it works just fine. However, if I try to call the same function from Java code like this: Object result = com.acme.forecast.core.runforecast("file1.csv",…
Paul Reiners
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