How to compile dynamic library for a JNI application on linux?

Question

I\'m using Ubuntu 10.10

So that\'s what I did.

Hello.java:

class Hello {
        public native void sayHello();

           


        

Answer 1

This complains about the C++ symbols not being available. I seem to remember, when I use to do JNI stuff all of the time that there were problems linking in C++ libraries and we always stuck to plain old C

If you change your code so that it's standard C (and rename the file):

#include 
#include "Hello.h"
#include 

JNIEXPORT void JNICALL Java_Hello_sayHello (JNIEnv *env, jobject obj) {
        printf("Hello World");
        return;
}

And compile it

gcc -I/usr/lib/jvm/java-6-openjdk/include  -o libhellolib.so -shared Hello.c

It works

java -Djava.library.path=`pwd` Hello
Hello World