Unable to load so

[XiongKe94]

2021-11-17 18:29:35.261 22431-22431/com.xxxx.demo I/System.out: Trying jlibtorrent.<so|dylib>...
2021-11-17 18:29:35.263 22431-22431/com.xxxx.demo W/System.err: java.lang.UnsatisfiedLinkError: dlopen failed: library "libjlibtorrent.so" not found
2021-11-17 18:29:35.263 22431-22431/com.xxxx.demo W/System.err: at java.lang.Runtime.loadLibrary0(Runtime.java:1087)
2021-11-17 18:29:35.263 22431-22431/com.xxxx.demo W/System.err: at java.lang.Runtime.loadLibrary0(Runtime.java:1008)
2021-11-17 18:29:35.263 22431-22431/com.xxxx.demo W/System.err: at java.lang.System.loadLibrary(System.java:1664)
2021-11-17 18:29:35.263 22431-22431/com.xxxx.demo W/System.err: at com.frostwire.jlibtorrent.swig.libtorrent_jni.(libtorrent_jni.java:25)
2021-11-17 18:29:35.263 22431-22431/com.xxxx.demo W/System.err: at com.frostwire.jlibtorrent.swig.libtorrent_jni.new_settings_pack__SWIG_0(Native Method)
2021-11-17 18:29:35.263 22431-22431/com.xxxx.demo W/System.err: at com.frostwire.jlibtorrent.swig.settings_pack.(settings_pack.java:40)
2021-11-17 18:29:35.263 22431-22431/com.xxxx.demo W/System.err: at com.apkmatrix.components.ultradownloader.torrentstream.TorrentUtils.defaultSettingsPack(TorrentUtils.kt:175)
2021-11-17 18:29:35.263 22431-22431/com.xxxx.demo W/System.err: at com.apkmatrix.components.ultradownloader.torrentstream.TorrentUtils.newSessionManager(TorrentUtils.kt:161)
2021-11-17 18:29:35.263 22431-22431/com.xxxx.demo W/System.err: at com.apkmatrix.components.ultradownloader.torrentstream.TorrentStream$startDownload$1.invokeSuspend(TorrentStream.kt:85)
2021-11-17 18:29:35.263 22431-22431/com.xxxx.demo W/System.err: at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
2021-11-17 18:29:35.263 22431-22431/com.xxxx.demo W/System.err: at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
2021-11-17 18:29:35.263 22431-22431/com.xxxx.demo W/System.err: at android.os.Handler.handleCallback(Handler.java:938)
2021-11-17 18:29:35.263 22431-22431/com.xxxx.demo W/System.err: at android.os.Handler.dispatchMessage(Handler.java:99)
2021-11-17 18:29:35.263 22431-22431/com.xxxx.demo W/System.err: at android.os.Looper.loop(Looper.java:223)
2021-11-17 18:29:35.263 22431-22431/com.xxxx.demo W/System.err: at android.app.ActivityThread.main(ActivityThread.java:7664)
2021-11-17 18:29:35.263 22431-22431/com.xxxx.demo W/System.err: at java.lang.reflect.Method.invoke(Native Method)
2021-11-17 18:29:35.263 22431-22431/com.xxxx.demo W/System.err: at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
2021-11-17 18:29:35.263 22431-22431/com.xxxx.demo W/System.err: at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
2021-11-17 18:29:35.266 22431-22431/com.xxxx.demo I/System.out: Loaded jlibtorrent-1.2.14.2

[gubatron]

make sure you have both the jlibtorrent.jar and jlibtorrent-android-<architecture>-<version>.jar jars in your project and referenced by your gradle build configuration file.

For example, in your build.gradle

...
dependencies {
def jlibtorrent_version = '1.2.14.2'
    implementation files('libs/jlibtorrent-' + jlibtorrent_version + '.jar')

    // att free phones use this and crashes
    implementation files('libs/jlibtorrent-android-arm-' + jlibtorrent_version + '.jar')

    // oneplus hd1905 uses this
    implementation files('libs/jlibtorrent-android-arm64-' + jlibtorrent_version + '.jar')

    // used by android emulator on macos
    implementation files('libs/jlibtorrent-android-x86-' + jlibtorrent_version + '.jar')

    implementation files('libs/jlibtorrent-android-x86_64-' + jlibtorrent_version + '.jar')
}
...

have the jlibtorrent jars in a "libs" folder

[pratik-pattanaik]

I'm seeing this issue in 1.2.15.1 as well (testing with Android 11, arm64 device) on first call to the library upon app startup. It's followed by a log message

I/System.out: Loaded jlibtorrent-1.2.15.1

Subsequent calls don't show this error and download functions as normal. Seems like the '.so' is loaded lazily only if calls to it fail.

[pratik-pattanaik]

So, this is why, but not sure why it's trying to load jlibtorrent first.

static {
        try {
            String path = System.getProperty("jlibtorrent.jni.path", "");
            if ("".equals(path)) {
                try {
                    System.out.println("Trying jlibtorrent.<so|dylib>...");
                    System.loadLibrary("jlibtorrent");
                    System.loadLibrary("Loaded jlibtorrent.<so|dylib> (version=" +  jlibtorrentVersion() + ")");
                } catch (LinkageError e) {
                    // give it a try to the name with version
                    e.printStackTrace();
                    try {
                        System.loadLibrary("jlibtorrent-" + jlibtorrentVersion());
                        System.out.println("Loaded jlibtorrent-" + jlibtorrentVersion());
                    } catch (Throwable t) {
                        t.printStackTrace();
                    }
                }
            } else {
                System.load(path);
            }
        } catch (LinkageError e) {
            throw new LinkageError(
                "Look for your architecture binary instructions at: https://github.com/frostwire/frostwire-jlibtorrent", e);
        }
    }