How do I get a list of JNI libraries which are loaded?

Question

Just what the subject says, is there a way in Java to get a list of all the JNI native libraries which have been loaded at any given time?

Answer 1

I've built on top of jitter's solution. This allows you to find out who (ClassLoader, Class) loaded each native library.

import java.lang.reflect.Field;
import java.util.*;
import java.util.Map.Entry;

/**
 * Helper functions for native libraries.
 * 

 * @author Gili Tzabari
 */
public class NativeLibraries
{
    private final Field loadedLibraryNames;
    private final Field systemNativeLibraries;
    private final Field nativeLibraries;
    private final Field nativeLibraryFromClass;
    private final Field nativeLibraryName;

    /**
     * Creates a new NativeLibraries.
     * 

     * @throws NoSuchFieldException if one of ClassLoader's fields cannot be found
     */
    public NativeLibraries() throws NoSuchFieldException
    {
        this.loadedLibraryNames = ClassLoader.class.getDeclaredField("loadedLibraryNames");
        loadedLibraryNames.setAccessible(true);

        this.systemNativeLibraries = ClassLoader.class.getDeclaredField("systemNativeLibraries");
        systemNativeLibraries.setAccessible(true);

        this.nativeLibraries = ClassLoader.class.getDeclaredField("nativeLibraries");
        nativeLibraries.setAccessible(true);

        Class nativeLibrary = null;
        for (Class nested : ClassLoader.class.getDeclaredClasses())
        {
            if (nested.getSimpleName().equals("NativeLibrary"))
            {
                nativeLibrary = nested;
                break;
            }
        }
        this.nativeLibraryFromClass = nativeLibrary.getDeclaredField("fromClass");
        nativeLibraryFromClass.setAccessible(true);

        this.nativeLibraryName = nativeLibrary.getDeclaredField("name");
        nativeLibraryName.setAccessible(true);
    }

    /**
     * Returns the names of native libraries loaded across all class loaders.
     * 

     * @return a list of native libraries loaded
     */
    public List getLoadedLibraries()
    {
        try
        {
            @SuppressWarnings("UseOfObsoleteCollectionType")
            final Vector result = (Vector) loadedLibraryNames.get(null);
            return result;
        }
        catch (IllegalArgumentException | IllegalAccessException e)
        {
            throw new AssertionError(e);
        }
    }

    /**
     * Returns the native libraries loaded by the system class loader.
     * 

     * @return a Map from the names of native libraries to the classes that loaded them
     */
    public Map> getSystemNativeLibraries()
    {
        try
        {
            Map> result = new HashMap<>();
            @SuppressWarnings("UseOfObsoleteCollectionType")
            final Vector