topic Re: Java, JNI, aCC in Operating System - HP-UX

Java, JNI, aCC

Lee Yeow leong — Sun, 12 Dec 1999 23:12:27 GMT

I'm trying to use JNI on a HP-UX 10.2 without success. Below is the steps
that I took.

1. Wrote the Java class.

public class HelloWorld {
public native void displayHelloWorld();

public static void main(String[] args) {
System.loadLibrary("hello");
new HelloWorld().displayHelloWorld();
}
}

2. javac HelloWorld.java
3. javah -jni HelloWorld
4. Wrote the c class
#include "HelloWorld.h"
#include

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

4. aCC -ext +z -c -D_HPUX -I/opt/java/include -I/opt/java/include/hp-ux hello.c

5. aCC -b -o libhello.sl hello.o -IC

6. export SHLIB_PATH=$(/bin/pwd):$SHLIB_PATH

However, when I try to run the java program using java HelloWorld, I got the
error java.lang.UnsatisfiedLinkError. Anyone knows what went wrong? TIA.

Re: Java, JNI, aCC

Xian xiang Wang — Sun, 12 Dec 1999 23:34:23 GMT

I guess you might need to grant executioin persmission of the share library
file via chmod a+x. Good luck.

Re: Java, JNI, aCC

Lee Yeow leong — Mon, 13 Dec 1999 16:54:22 GMT

The permission has already been lowered. :(

Any other ideas? tia.

Re: Java, JNI, aCC

Yu-hsin Seah_2 — Fri, 17 Dec 1999 03:35:52 GMT

Can you try to see if you can run the demo JNI app in:

/opt/java/docs/hpux/JavaCallingNative

Run the "build" script and see if you still get an error similar to:

error: java.lang.UnsatisfiedLinkError: no aCCImpl in shared library path

If so, you may want to check what the version of your dld.sl (dynamic link
loader) is. Also, you may want to check what JDK version you are using. I was
testing with JDK1.17 and the "what" output of my dym link loader files is:

/usr/lib/dld.sl:
SMART_BIND
92453-07 dld dld dld.sl B.10.32 990202

/usr/lib/libdld.1:
92453-07 dld dld libdld.sl B.10.32 990202

I have PHSS_17225 dld.sl patch installed.

Re: Java, JNI, aCC

Lee Yeow leong — Sun, 19 Dec 1999 01:18:50 GMT

Thanks. I didn't know the sample program was there. :)

I able to run it and have found the problem with my code. I have
misunderstood that the shared library should be prefixed with libc instead of
c.

Thank you! Merry Christmas!