Problem with Java JNI Java and C

curious7 — Thu, 19 Jan 2012 21:31:35 GMT

Hi,

I need a Java program to call a C program (not C++). I’m following the instructions on HP-UX Programmer's Guide for Java™ 2. However, it doesn’t work. Here are the Java and platform versions:

$uname –mr

B.11.31 ia64

java –version

java version "1.6.0.11"

Java(TM) SE Runtime Environment (build 1.6.0.11-jinteg_14_jul_2011_03_07-b00)

Java HotSpot(TM) Server VM (build 20.1-b02-jre1.6.0.11-rc2b1, mixed mode)

It compiles and builds the library fine and I do set SHLIB_PATH to the directory of the library. I compile:

cc -Ae +u4 +z -c -D_HPUX \

> -I/opt/java6/include -I/opt/java6/include/hp-ux -I./ \

> myProg.c

And build the shared lib as either:

aCC -b -o myProg.so myProg.o \

-lstd -lstream -lCsup -lm

(tried it also with cc)

Or as:

ld -b -o myProg.so myProg.o

And tried some other options. But always when I run the Java program that calls this C program I get:

java.lang.UnsatisfiedLinkError: no myProg in java.library.path

Can someone point the exact compile and library build commands for this platform and Java version? I did test the Java Property and verified the directory of the shared library is there.

Thanks.

Re: Problem with Java JNI Java and C

Dennis Handly — Fri, 20 Jan 2012 05:42:14 GMT

>And build the shared lib as either:

aCC -b -o myProg.so myProg.o -lstd -lstream -lCsup -lm

This is incorrect, I thought I got them to change it.

For Integrity, -AA:

aCC -b -o libmyProg.so myProg.o -lstd_v2 -lCsup -lunwind -lm

>(tried it also with cc)

You shouldn't really be using ld:

cc -b -o libmyProg.so myProg.o

>Can someone point the exact compile and library build commands for this platform and Java version?

I think the key point is that you have to have the "lib" prefix and the ".so" suffix.

I'm not sure what step needs the "export CLASSPATH=..."?

topic Problem with Java JNI Java and C in Operating System - HP-UX

Problem with Java JNI Java and C

Re: Problem with Java JNI Java and C