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Date: Wed, 27 May 2009 08:34:00 -0000
Message-ID: <6f1633170905270134m29a652d6g270a7fb97833bf05@mail.gmail.com>
Subject: Invoking JNI function using gcj
From: Vaijayanthi Mala Suresh <vaijayanthimalas@gmail.com>
To: java@gcc.gnu.org
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I have written an HelloWorld.java as given below

public class HelloWorld {
=A0 =A0public native void natPrint();

=A0 =A0public HelloWorld()
=A0 =A0{
=A0 =A0 =A0System.out.println("Hello from constructor");
=A0 =A0}
=A0 =A0public void printline()
=A0 =A0{
=A0 =A0 =A0System.out.println("Hello from printline");
=A0natPrint()
=A0 =A0}
=A0 =A0public static void main(String [] args) {
=A0 =A0 =A0System.out.println("Hello from main");
=A0 =A0 =A0HelloWorld ht =3D new HelloWorld();
=A0 =A0 =A0ht.printline();
=A0 =A0}
static
{
=A0System.loadLibrary("HelloWorld");
}
=A0}

I have compiled it with gcj as given below
gcj -c -fjni HelloWorld.java
gcj -C HelloWorld.java
gcjh HelloWorld
gcjh -jni HelloWorld -o HelloNative.h
gcjh -stubs -jni HelloWorld
g++ -I. -c HelloWorld.c natHelloWorld.o
gcj -shared natHelloWorld.o -o libHelloWorld.so

Copied the .so file into the folder as /lib and it set in LD_LIBRARY_PATH.

I have a cppstartup.cpp which does the JVM Initialization and has
invokes HelloWorld as given below

#include "HelloWorld.h"

using namespace java::lang;

=A0 =A0 =A0 try
=A0 =A0 =A0 {
JvCreateJavaVM(NULL);
JvAttachCurrentThread(NULL, NULL);

=A0 =A0 =A0 String *message =3D JvNewStringLatin1("Hello from C++");
=A0 =A0 =A0 JvInitClass(&System::class$);
=A0 =A0 =A0 System::out->println(message);

=A0 HelloWorld *ht =3D new HelloWorld();
=A0 =A0 =A0 ht->printline();

=A0 =A0 =A0 JvDetachCurrentThread();
=A0 =A0 =A0 }
=A0 =A0 =A0 catch (Throwable *t)
=A0 =A0 =A0 {
=A0 =A0 =A0 =A0 System::err->println(JvNewStringLatin1("Unhandled Java exce=
ption:"));
=A0 =A0 =A0 =A0t->printStackTrace();
=A0 =A0 =A0 }

This throws an exception =A0me "Unsatisfied Linker Error"

Can someone help me in this regard?