Question

I’m currently using the JNI to generate C headers for native methods being used in a Java class ABC. However, I’d like to use these methods elsewhere, in another class XYZ, so hence I made a class called cLib which basically just had the prototypes of the native methods, and which when generated gave me the header file for the methods I needed.

The problem is, JNI attaches the name of the Java class the prototype was declared in to the name of the function in the header file, so would I need to just separately generate two header files for each of the Java classes ABC, XYZ?

Best.

Answer 1

Three options:

1. Call same library methods from Java.

public class Boo {
public V doSomething(...) {
    return (Common.doSomething(...));
}
}
public class Wow {
public V doSomething(...) {
    return (Common.doSomething(...));
}
}
public class Common {
public static native V doSomething(...);
}
/** Trivial JNI Implementation omitted... */

2. Call same library methods from C/Assembly.

public class Boo {
public V native doSomething(...);
}
public class Wow {
public V native doSomething(...);
}
/** Both JNI methods call same C/Assembly native function, similarly... */

3. Duplicate code automatically. 😉

see java.lang.Compiler

Cheers,
leoJava