I've read many great things about LuaJava (library). However, I still can't find any good documentation on how to transfer data between the Lua scripts and Java application. How is this done? I apologize if I missed a tutorial somewhere...
Transfering data between Lua scripts and Java application with LuaJava
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There's a reference manual here: http://www.keplerproject.org/luajava/manual.html. The Java documentation is at the bottom.
Here's an example (although it might be a bit out-dated): http://lua-users.org/lists/lua-l/2003-12/msg00286.html
You might want to start with understanding the C interface to Lua. The LuaJava interface is built on that. The basic idea is that you have a stack and you first push the function, followed by arguments, and then you can execute a function in Lua. The results are then pushed on the stack and you can get data back from Lua that way.