SunUltra1, Solaris2.6 JDK1.2beta2

When using Java Native methods, if there is an error in the c file, which
compiles, then the error message returned by the java runtime is not as
clear in JDK1.2 as in JDK1.1.5.

In the following example, the function strncpy is misspelled strncopy.
the JDK1.1.5 runtime gives a ld.so:
"symbol strncopy: referenced symbol not found (libhello.so)"

the JDK1.2 runtime does not give the ld.so error message, which makes debugging
much harder.

================================
Run under jdk1.1.5:

illium% ls
HelloWorld.c HelloWorld.h Main.class Makefile
HelloWorld.class HelloWorld.java Main.java libhello.so

illium% java Main
ld.so.1: /usr/local/java/jdk1.1.5/solaris/bin/../bin/sparc/green_threads/java: fatal: relocation error: file ./libhello.so: symbol strncopy: referenced symbol not found (libhello.so)
                                                   ^^^^^^^^
                                                    |-typo should be strncpy

java.lang.UnsatisfiedLinkError: no hello in shared library path
at java.lang.Runtime.loadLibrary(Runtime.java)
at java.lang.System.loadLibrary(System.java)
at
at java.lang.Thread.init(Thread.java)

illium%
illium% which java
/usr/local/java/jdk1.1.5/solaris/bin/java


================================
run under jdk1.2:

illium% java Main
java.lang.UnsatisfiedLinkError: no hello in shared library path
at java.lang.Runtime.loadLibrary0(Runtime.java:429)
at java.lang.System.loadLibrary(System.java:638)
at
illium%
illium% which java
/usr/local/java/jdk1.2/solaris/bin/java




================================
C source "HelloWorld.c"

#include <jni.h>
#include "HelloWorld.h"
#include <stdio.h>
char a1[]="hello";
char a2[]="byebye";

JNIEXPORT void JNICALL
Java_HelloWorld_displayHelloWorld(JNIEnv *env, jobject obj)
{
           printf("Hello world!\n");
strncopy(a1,a2,5);
           return;
         }

================================
java source "Main.java"

illium% cat Main.java
class Main {
public static void main(String[] args) {
new HelloWorld().displayHelloWorld();
}
}

================================
java source "HelloWorld.java"

illium% cat H*java
class HelloWorld {
public native void displayHelloWorld();

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

illium%