Compiling shared objects for JNI

[Kevin McWhirter]

How does one compile/link the shared object for JNI modules.

Here is an example the shows the problems I am having.  I follow the steps
in the Tutorial; namely:
1)      Create Java code (HelloWorld.java)
2)      Compile
3)      Create header for stubs (HelloWorld.h)
4)      Create C/C++ code (HelloWorld.C)
5)      Compile/link with jni.h
6)      Set LD_LIBRARY_PATH
7)      Execute

I end up with the following error message when I try to execute:
Exception in thread "main" java.lang.UnsatisfiedLinkError:
/home/klmcw/src/Java/JNI/libhwrld.so: /home/klmcw/src/Java/JNI/libhwrld.so:
ELF file's phentsize not the expected size
        at java.lang.ClassLoader$NativeLibrary.load(Native Method)
        at java.lang.ClassLoader.loadLibrary0(Compiled Code)
        at java.lang.ClassLoader.loadLibrary(Compiled Code)
        at java.lang.Runtime.loadLibrary0(Compiled Code)
        at java.lang.System.loadLibrary(Compiled Code)
        at HelloWorld.<clinit>(HelloWorld.java:15)

What is this ELF file phentsize error about?  Any ideas?  Thanks in advance.

I have included the source below just in case.
Kevin

-+-+-+-+-+-+-+-+-+-+-+-CUT-+-+-+-+-+-+-+-+-+-+-+-
HelloWorld.java
class HelloWorld {
        String s = null;

        public HelloWorld() {
                s = HelloWorldAux();
        }

        public native String HelloWorldAux();

        public String toString() {
                return this.s;
        }

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

        static public int main(String[] args) {
                try {
                        HelloWorld hw = new HelloWorld();

                        System.out.println(hw.toString());
                } finally {
                        return 0;
                }
        }
}
-+-+-+-+-+-+-+-+-+-+-+-CUT-+-+-+-+-+-+-+-+-+-+-+-
HelloWorld.C

#include "HelloWorld.h"


JNIEXPORT jstring JNICALL
Java_HelloWorld_HelloWorldAux(JNIEnv *jenv, jobject jobj)
{
        static char hw[] = "Hello, World!";

        return jenv->NewStringUTF(hw);
}
-+-+-+-+-+-+-+-+-+-+-+-CUT-+-+-+-+-+-+-+-+-+-+-+-
Makefile


INCLUDES=-I/opt/web/jdk1.2/include -I/opt/web/jdk1.2/include/linux

CXXFLAGS=-c -fpic -O2 $(INCLUDES)

all: libhwrld.so

libhwrld.so: HelloWorld.C HelloWorld.h
        g++ $(CXXFLAGS) $< -o $@

HelloWorld.h: HelloWorld.class
        javah -jni HelloWorld

HelloWorld.class: HelloWorld.java
        javac -O HelloWorld.java


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