Java: load shared libraries with dependencies

Question

I am wrapping a shared library (written in C) with Java using JNA. The shared library is written internally, but that library uses functions from another external library, which

Answer 1

In order to fix your issue you can use this package: https://github.com/victor-paltz/global-load-library. It loads the libraries directly with the RTLD_GLOBAL flag.

Here is an example:

import com.globalload.LibraryLoaderJNI;

public class HelloWorldJNI {
 
    static {
        // Loaded with RTLD_GLOBAL flag
        try {
            LibraryLoaderJNI.loadLibrary("/path/to/my_native_lib_A");
        } catch (UnsatisfiedLinkError e) {
            System.Println("Couldn't load my_native_lib_A");
            System.Println(e.getMessage());
            e.printStackTrace();
        }

        // Not loaded with RTLD_GLOBAL flag
        try {
            System.load("/path/to/my_native_lib_B");
        } catch (UnsatisfiedLinkError e) {
            System.Println("Couldn't load my_native_lib_B");
            System.Println(e.getMessage());
            e.printStackTrace();
        }
    }
    
    public static void main(String[] args) {
        new HelloWorldJNI().sayHello();
    }
 
    private native void sayHello();
}

It is using the same dlopen() trick as the previous answers, but it is packaged in a standalone code.