Can you help me compile the GCC for JNI in Ubuntu ? What happens is that when creating the . "So" , and compile by calling the necessary libraries, in my case (for the Java version I use) ...
gcc -shared -I/usr/lib/jvm/java-8-oracle/include/ -I/usr/lib/jvm/java-8-oracle/include/linux/ -o libHolaMundo.so HolaMundo.c -Wall
... I get the error that:
In file included from HelloWorld.c: 3: 0:
HolaMundo.h: 2: 17: fatal error: jni.h: No such file or directory
#include <jni.h>
Using JNI for the first time can be a bit complicated, I recommend using JNA. From JNA you can call native code without recompiling the executable or modifying it.
I give you an example with JNA:
Code in C:
#include //se usa la entrada por defecto stdio.h
void helloFromC() {
printf("Hello from C!\n");
}To compile: gcc -o libctest.so -shared ctest.c
To use this library from Java:
import com.sun.jna.Library;
import com.sun.jna.Native;
public class HelloWorld {
public interface CTest extends Library {
public void helloFromC();
}
static public void main(String argv[]) {
CTest ctest = (CTest) Native.loadLibrary("ctest", CTest.class);
ctest.helloFromC();
}
}More information:
Regarding your problem: The compiler could not find the header file jni.h, put it in the header folder and recompile it.