Deprecated

jvm

Call JVM methods from Haskell.

http://github.com/tweag/inline-java/tree/master/jvm#readme

Version on this page:0.4.0
LTS Haskell 12.26:0.4.2
Stackage Nightly 2018-09-28:0.4.2
Latest on Hackage:0.6.0@rev:2

See all snapshots jvm appears in

BSD-3-Clause licensed by Tweag I/O
Maintained by [email protected]
This version can be pinned in stack with:jvm-0.4.0@sha256:10dc29399519fc8ed430f670b8340c5ff8031c6e7be8aa09602c67a77f226fb6,1494

Module documentation for 0.4.0

Used by 1 package in nightly-2017-12-06(full list with versions):
inline-java

jvm: Call any JVM function from Haskell

jvm on Stackage LTS jvm on Stackage Nightly

This package enables calling any JVM function from Haskell. If you’d like to call JVM methods using Java syntax and hence get the Java compiler to scope check and type check all your foreign calls, see inline-java, which builds on top of this package.

Example

Graphical Hello World using Java Swing:

{-# LANGUAGE DataKinds #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE OverloadedStrings #-}

import Data.Text (Text)
import Language.Java

newtype JOptionPane = JOptionPane (J ('Class "javax.swing.JOptionPane"))
instance Coercible JOptionPane ('Class "javax.swing.JOptionPane")

main :: IO ()
main = withJVM [] $ do
    message <- reflect ("Hello World!" :: Text)
    callStatic
      (classOf (undefined :: JOptionPane))
      "showMessageDialog"
      [JObject nullComponent, JObject (upcast message)]
  where
    nullComponent :: J ('Class "java.awt.Component")
    nullComponent = jnull