HP-UX Programmer's Guide for Java 2

public static void main(String args[])
{
String libname = args[0];
try {
System.loadLibrary(libname);
System.out.println("Library " +
libname + " successfully loaded");
}
catch (UnsatisfiedLinkError Err) {
System.out.println("error: " + Err);
return;
}
System.out.println("Calling sayHelloWorld");
sayHelloWorld();
System.out.println("All done");
}
}
Compile this class:
$ <java_dir>/bin/javac -verbose TestJava2CallingNative.java
Output:
TestJava2CallingNative.class
Generate the JNI header file for this class. You must have the current directory in your
CLASSPATH for the javah command to find your newly compiled class file.
$ <java_dir>/bin/javah -verbose -jni TestJava2CallingNative
Output:
TestJava2CallingNative.h
Here is the sample C native method implementation for sayHelloWorld:
/*
* File cImpl.c
*/
#include "TestJava2CallingNative.h"
#include <stdio.h>
JNIEXPORT void JNICALL
Java_TestJava2CallingNative_sayHelloWorld(JNIEnv *env, jclass class)
{
printf("C says HelloWorld via stdio\n");
}
To compile this C source file:
$ cc -Ae +u4 +z -c -mt -I<java_dir>/include \
-I<java_dir>/include/hp-ux cImpl.c
Output
cImpl.o
48 Using Java™ 2 JNI on HP-UX