How to Compile JNI program on windows/cygwin

[Suresh]

Hi,

I am working on windows xp, java(jdk1.5.0_06) installed on it. I dont
have developer studio. i installed cygwin and gcc, make working fine on
cygwin.

now i would like to compile a simple JNI program. but i am getting so
many errors like this.

JavaSide.java:
public class JavaSide {
public native void sayHello();

static {
System.loadLibrary("NativeSideImpl");
}

public static void main(String[] args) {
JavaSide app = new JavaSide();
app.sayHello();
}
}
------------------------------------------
NativeSideImpl.cpp:

#include <stdio.h>
#include "JavaSide.h"

JNIEXPORT void JNICALL Java_JavaSide_sayHello
(JNIEnv *env, jobject obj)
{
printf("Hello Native World!");
}
---------------------------------------------

steps i followed is:
1) javac JavaSide.java
2) javah JavaSide
3) gcc -I /cygdrive/c/Program Files/Java/jdk1.5.0_06/include/ -I
/cygdrive/c/Program Files/Java/jdk1.5.0_06/include/win32
NativeSideImpl.cpp

Now i am getting so may errors like this

In file included from /cygdrive/c/Program
Files/Java/jdk1.5.0_06/include/jni.h:27,
from JavaSide.h:2,
from NativeSideImpl.cpp:2:
/cygdrive/c/Program Files/Java/jdk1.5.0_06/include/win32/jni_md.h:16:
error: `__int64' does not name a type
In file included from JavaSide.h:2,
from NativeSideImpl.cpp:2:
/cygdrive/c/Program Files/Java/jdk1.5.0_06/include/jni.h:108: error:
`jlong' does not name a type
/cygdrive/c/Program Files/Java/jdk1.5.0_06/include/jni.h:307: error:
expected identifier before '*' token
/cygdrive/c/Program Files/Java/jdk1.5.0_06/include/jni.h:308: error:
ISO C++ forbids declaration of `jlong' with no type
/cygdrive/c/Program Files/Java/jdk1.5.0_06/include/jni.h:308: error:
`jlong' declared as function returning a function
/cygdrive/c/Program Files/Java/jdk1.5.0_06/include/jni.h:308: error:
ISO C++ forbids declaration of `CallLongMethod' with no type
/cygdrive/c/Program Files/Java/jdk1.5.0_06/include/jni.h:308: warning:
`__stdcall__' attribute only applies to function types


Can any one please help me in compiling this simple program.

Thanks in advance.
Suresh

 

[Gordon Beaton]

I am working on windows xp, java(jdk1.5.0_06) installed on it. I dont
have developer studio. i installed cygwin and gcc, make working fine on
cygwin.

now i would like to compile a simple JNI program. but i am getting
so many errors like this.

I googled for cygwin gcc jni and this was the second hit:

http://www.inonit.com/cygwin/jni/helloWorld/c.html

/gordon

 

[Suresh]

Thank you Mr Gordon.

This link helped me solving my problem.

--Suresh