ANNOUNCE: Haskell/Java VM Bridge 0.2.1 Release

[Ashley Yakeley]

Release 0.2.1 of Haskell/Java VM Bridge is now available in source-code 
form. 

0.2.1 is a minimal update to work with GHC 6.0. If you are using GHC 
5.04, you should use the 0.2 release instead.


Haskell/Java VM Bridge allows Haskell programs access to the Java Virtual 
Machine. It comes in two parts: the 'Native' part, that abstracts away 
differences in the various Java VMs, and the 'Haskell' part that provides 
a Haskell API. The Native part is not Haskell-specific, and could 
potentially be used by other languages wishing to access the Java VM.

Features include:

* Calling of Java methods, access to fields, array-handling;

* Integration of garbage collectors;

* Reconciliation of exception models;

* Reconciliation of thread models, including 'synchronized' monitor 
support and the ability to fork Haskell actions as Java threads;

* Strong typing for Java classes and method argument lists (as tuples), 
and use of Haskell lists as arrays;

* Creation of Java classes 'on the fly' (using DefineClass and the Java 
Class File Format) that can have Haskell callback methods;

* Lifted monads which do all the necessary JNI class and method/field ID 
preloading and 'JNIEnv'-pointer variable handling for you -- these can be 
automatically generated via a tool (MakeJVMModule);

* Layered design includes lower-level IO-based interface;

* Automatic generation of modules for Java API classes;

* All relevant imports, flags and libraries etc. handled by a single GHC 
package 'javavm';

* No 'unsafe' Haskell calls or pure function FFI anywhere;

* Easy to port to new Java VMs.

This release should be 'beta' quality, but has undergone little testing.

You will need:

* An x86 machine running some form of Unix, or a Mac OS X machine;

* GHC 6.0 or later;

* A Java VM. It's been tested only with Sun's JVM, but should (may?) work 
with a number of others.

Haddock documentation is currently blocked on a bug in Haddock ("implicit 
parameters"). Should that be fixed, you will be able to build API 
documentaion by doing "make doc".

Some simple examples have been included such as a program that shows a 
Java Frame containing an instance of a Haskell-defined subclass of Canvas 
that has a Haskell 'paint' method that draws an oval. You should be able 
to figure out most of it from that.

Haskell/JVM Bridge and source code is licensed under the GNU Lesser GPL.

<http://sourceforge.net/projects/jvm-bridge/>


Future plans:

* port to Cygwin

* use hierarchical module structure

* separate out pure (non-FFI) Haskell into a separate package

* better typing for the IO-based layer


-- 
Ashley Yakeley, Seattle WA
Almost empty page: <http://semantic.org/>