[Mingw-users] [mingw - Java] How to use Java, C and CNI in two packages

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By: gnulrich1

Hi,

I don't manage to write a hello-world-program,
which uses Java, C and CNI.

--- package ulrich ---

The package ulrich is in the path D:\ and
contains the Java-declarations and the native C-code:

*** D:\ulrich\ShCNI.java ***

package ulrich;

public class ShCni
{	public static native void hello();
	public static native void world();
}

*** end ***

*** D:\ulrich\ShCni.cc ***

#include "ShCni.h"
#include <stdio.h>
#include <gcj/cni.h>

void ulrich::ShCni::hello ()
{	printf( "ulrich::ShCni::hello\n" );
}

void ulrich::ShCni::world ()
{	printf( "ulrich::ShCni::world\n" );
}

*** end ***

I compiled ShCni.java to get ShCni.o:
gcj -c -g -O ShCni.java

I compiled ShCni.java to get ShCni.class:
gcj -C ShCni.java

I used ShCni.class to get ShCni.h:
gcjh ShCni

I compiled ShCni.cc to get Native.o:
gcc -o Native.o -c ShCni.cc

--- package app ---

The package app is in the path D:\ and
contains the Java-app:

*** D:\app\App.java ***

package app;

import ulrich.*;

public class App
{
	public static void main( String[] args )
	{
		System.out.println( "app.App.main" );
		ShCni.hello();
		ShCni.world();
	}
}

*** end ***

I tried to compiled App.java to get App.exe:
gcj --main=app.App -o App ../ulrich/Native.o ../ulrich/ShCni.o App.java

The error-message is:
App.java:11: error: Can't find method `world()' in type `ulrich.ShCni'.
                ShCni.world();
                        ^
1 error

gcj finds obviously method ShCni.hello();
Why can't gcj find method ShCni.world(); ?
If I delete ShCni.world(); in App.java
everything works well and App.exe gives out:
app.App.main
ulrich::ShCni::hello

Thanks
Ulrich

PS:
Maybe my installation of MinGW is not correct,
because I don't know, how to install it correctly,
see topic: 'How to install MinGW correctly'.


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