https://github.com/async-profiler/async-profiler/issues/843

dlfcn.c

/*
 * Copyright The async-profiler authors
 * SPDX-License-Identifier: Apache-2.0
 */

#include <jvmti.h>
#include <dlfcn.h>

JNIEXPORT jlong JNICALL Java_Dlfcn_dlopen(JNIEnv* env, jclass cls, jstring libname) {
    const char* libname_c = (*env)->GetStringUTFChars(env, libname, NULL);
    void* ret = dlopen(libname_c, RTLD_NOW);
    (*env)->ReleaseStringUTFChars(env, libname, libname_c);
    return (jlong)ret;
}

JNIEXPORT jint JNICALL Java_Dlfcn_dlclose(JNIEnv* env, jclass cls, jlong handle) {
    return dlclose((void*)handle);
}

JNIEXPORT jlong JNICALL Java_Dlfcn_dlsym(JNIEnv* env, jclass cls, jlong handle, jstring sym) {
    const char* sym_c = (*env)->GetStringUTFChars(env, sym, NULL);
    void* ret = dlsym((void*)handle, sym_c);
    (*env)->ReleaseStringUTFChars(env, sym, sym_c);
    return (jlong)ret;
}

Dlfcn.java

/*
 * Copyright The async-profiler authors
 * SPDX-License-Identifier: Apache-2.0
 */

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.concurrent.ThreadLocalRandom;
import java.util.stream.Stream;

public class Dlfcn {
    private static final int THREADS = 4;
    private static final int ITERATIONS = 100000;

    static {
        System.loadLibrary("dlfcn");
    }

    public static void main(String[] args) throws Exception {
        String[] libs;
        try (Stream<Path> stream = Files.list(Paths.get(System.getProperty("java.home"), "lib"))) {
            libs = stream.map(path -> path.getFileName().toString())
                    .filter(filename -> filename.endsWith(".so"))
                    .toArray(String[]::new);
        }

        for (int i = 0; i < THREADS; i++) {
            new Thread(() -> loop(libs)).start();
        }
    }

    private static void loop(String[] libs) {
        for (int i = 0; i < ITERATIONS; i++) {
            String lib = libs[ThreadLocalRandom.current().nextInt(libs.length)];
            long handle = dlopen(lib);
            if (handle != 0) {
                System.out.printf("[%s] %s = 0x%x\n", Thread.currentThread().getName(), lib, handle);
                dlclose(handle);
            }
        }
    }

    public static native long dlopen(String libname);

    public static native int dlclose(long handle);

    public static native long dlsym(long handle, String sym);
}