World: r4wp

First release of prototype low-level bridge with Java world:

https://github.com/dockimbel/Red/tree/dyn-lib-emitter/red-system/bridges/java

This is a low-level interface suitable for Red/System. Red will have 
a higher-level abstraction layer for interacting with Java.

This has been tested on Windows only currently, let me know if there's 
issues on other platforms.

Can't somehow build it ....

do/args %rsc.r "%bridge/java/JNIdemo.reds -o %bridge/java/JNIdemo" 
... there's a typo, should be %bridges/

You need to have the JDK installed.

Ah thanks!

Fixed.

Don't want to have JDS installed :-)

I got exe, it just prints nothing ... wouldn't I be fine with jus 
same JAVA libs?

Exe??

>> do/args %rsc.r "%bridges/java/JNIdemo.reds -o %bridges/java/JNIdemo"

-= Red/System Compiler =-
Compiling bridges/java/JNIdemo.reds ...

...compilation time:     114 ms
...linking time:         4 ms
...output file size:     6656 bytes
...output file name:     bridges/java/JNIdemo.exe

Sorry, forgot to add the -dlib option in the README.

ok ...

Fix pushed.

JNIdemo.dll

Right.

Now you need to compile the Java side.

you mean JNIdemo.java, right? And for that, I need JDK installed 
....

Someone can also send you the compiled .class file, but you'll at 
least need the JRE installed :)

Yep.

Right, if you need to install Java, go for the JDK instead of the 
JRE.

My idea is, that I don't need JAVA at all, and that Red compiler 
spits out final app for me :-)

well, I mean - that I don't need JDK, just typical JAVA client installation 
...

Andreas, does it work on Linux for you? It seems there's a library 
path access issue there.

That's the JRE.

(@Pekr ^^)

JRE is typically installed on Windows machines, but not sure nowadays. 
But I somehow has it insatlled on my notebook ...

@Pekr: http://bolka.at/2013/red/JNIdemo.class(compiled with Java 
7; hope that doesn't cause problems).

Pekr: if you want to put yourself in the end-user shoes only, then 
just forget about this Java stuff until we get full Android support. 
If you want to test the steps in the meantime, just install the JDK.

Andreas, you need to publish the events.class file too, or they won't 
be able to close the window. ;-)

downloading JDK, but good to know, that end users will not need to 
fight all that stuff ...

well, what is the .class file good for anyway, even if I have JRE?

The .class file is Java's "exe".

Java 7: I think I've relied on Java 6 docs, but it should work as 
these are old APIs.

http://bolka.at/2013/red/events.class

Hmm, on second thought, Pekr, if you don't know what .class are, 
maybe don't bother with JDK then...;-)

With the JRE, you can run code in .class files.

We'll provide precompiled classes for you to test.

Hmm, the above classes don't run for me with a Java 6 JRE. So ignore 
them, if you don't have Java 7 already.

> java -version
java version "1.6.0_21"
Java(TM) SE Runtime Environment (build 1.6.0_21-b07)
Java HotSpot(TM) Client VM (build 17.0-b17, mixed mode, sharing)

Well, looking into binary .class, I expected it being some kind of 
executable or package, just pressing Enter does nothing :-) So it 
is not mapped to JRE on my machine .... I selected it manually, and 
it says:

Could not find or load main class, or something like that ...

open a command prompt, change to the directory the .class is stored 
in, and run `java JNIdemo`

error and crash "problematic frame ...."

Pekr: > java -version

1.7.0_13

Exception Access Violation (0xc0000005)

Get a "problematic frame" crash as well (Linux, 6.0_26-b03).

Doc: for Linux to work, you need to rename the .so to libJNIdemo.so, 
and start the demo with `java -Djava.library.path=. JNIdemo`.

Andreas and Pekr: are you using 64-bit OSes?