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[LDT 1.0] load a module written in Java [message #1273956]

Thu, 20 March 2014 20:03

Baiqian Zhang

Messages: 2
Registered: March 2014

Junior Member

I met a problem when I tried to load a module written in Java.
Such as:
require 'Hyperbolic'

I followed the instruction from LuaJ, adding Hyperbolic to classpath. And I can do it in command line, like:
java -cp someDirectory lua HyperbolicApp.lua

However I don't know how to do it in LDT. There is no "ClassPath" in the "Run Configuration".
Please help me.

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Re: [LDT 1.0] load a module written in Java [message #1277849 is a reply to message #1273956]

Wed, 26 March 2014 14:49

Simon Bernard

Messages: 296
Registered: July 2009

Senior Member

Hi

To use LuaJ as interpreter you should create a new "Lua Generic".(Windows/Preferences/Lua/Interpreter)

as interpreter executable, your "java" executable.
as interpreter arguments, this big line Smile

-cp "/home/sbernard/Dev/juaj/luaj-3.0-beta2/lib/luaj-jse-3.0-beta2.jar" lua -e "local system = luajava.bindClass('java.lang.System'); local luapath = system:getenv('LUA_PATH'); if luapath then package.path=luapath end;"

Explication :

-cp "/home/sbernard/Dev/juaj/luaj-3.0-beta2/lib/luaj-jse-3.0-beta2.jar"

==> to add the luaJ jar to the classpath

lua

==> to use the lua script engine registered by luaj

-e "local system = luajava.bindClass('java.lang.System');
local luapath = system:getenv('LUA_PATH');
if luapath then package.path=luapath end;"

==> This lines of code is to workarround the fact that luaJ does not implement os.getenv correctly, it use System.getProperties instead of System.getenv. It's look like a bug.

With this you should run your lua script with luaj interpreter but not debug it :/.

I you want to debug, it should be possible but you need to write some code.
(I never test this so maybe, this will not works)

you should hack luaJ(I mean modify the code):

fix the getenv function in OsLib.java
the _VERSION global var should return "Lua 5.1" or "Lua 5.2" (see public static final String _VERSION = "Luaj 0.0" in Lua.java;
you could fix the DEFAULT_LUA_PATH in PackageLib to use getenv instead too

Then you should implement your own transport interface based on your luasocket for our debugger (see the interface and the transport parameter)

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