Together with a friend I have created an Android app to organize school grades. The app works fine on my device and on most user devices, however there is a crashing rate over 3 percent, mostly because of java.lang.UnsatisfiedLinkError and occurring on Android versions 7.0, 8.1 as well as 9.
I've tested the app on my phone and on several emulators, including all the architectures. I upload the app to the app store as an android-app-bundle and suspect that this could be the source of the problem.
I am a bit lost here, because I've tried already several things but so far I was not able to either reduce the number of occurrences nor to reproduce it on any of my devices. Any help will be highly appreciated.
I have found this resource which points out that Android sometimes fails to unpack external libraries. Therefore they created a ReLinker library which will try to fetch the libraries from the compressed app:
Unfortunately, this did not reduce the amount of crashes due to java.lang.UnsatisfiedLinkError. I continued my online research and found this article, which suggests that the problem lies in the 64-bit libraries. So I removed the 64bit libraries (the app still runs on all devices, because 64-bit architectures can also execute 32-bit libraries). However, the error still occurs in the same frequency like before.
Through the google-play-console I got the following crash report:
java.lang.UnsatisfiedLinkError:
at ch.fidelisfactory.pluspoints.Core.Wrapper.callCoreEndpointJNI (Wrapper.java)
at ch.fidelisfactory.pluspoints.Core.Wrapper.a (Wrapper.java:9)
at ch.fidelisfactory.pluspoints.Model.Exam.a (Exam.java:46)
at ch.fidelisfactory.pluspoints.SubjectActivity.i (SubjectActivity.java:9)
at ch.fidelisfactory.pluspoints.SubjectActivity.onCreate (SubjectActivity.java:213)
at android.app.Activity.performCreate (Activity.java:7136)
at android.app.Activity.performCreate (Activity.java:7127)
at android.app.Instrumentation.callActivityOnCreate (Instrumentation.java:1272)
at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2908)
at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:3063)
at android.app.servertransaction.LaunchActivityItem.execute (LaunchActivityItem.java:78)
at android.app.servertransaction.TransactionExecutor.executeCallbacks (TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1823)
at android.os.Handler.dispatchMessage (Handler.java:107)
at android.os.Looper.loop (Looper.java:198)
at android.app.ActivityThread.main (ActivityThread.java:6729)
at java.lang.reflect.Method.invoke (Method.java)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:876)
The Wrapper.java is the class which calls our native library. The line it points to however just reads as follows:
import java.util.HashMap;
The ch.fidelisfactory.pluspoints.Core.Wrapper.callCoreEndpointJNI is the entry point to our native cpp library.
In the native cpp library we use some external libraries (curl, jsoncpp, plog-logging, sqlite and tinyxml2).
Edit 4th June 2019
As requested, here the code of Wrapper.java:
package ch.fidelisfactory.pluspoints.Core;
import android.content.Context;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.Serializable;
import java.util.HashMap;
import ch.fidelisfactory.pluspoints.Logging.Log;
/***
* Wrapper around the cpp pluspoints core
*/
public class Wrapper {
/**
* An AsyncCallback can be given to the executeEndpointAsync method.
* The callback method will be called with the returned json from the core.
*/
public interface AsyncCallback {
void callback(JSONObject object);
}
public static boolean setup(Context context) {
String path = context.getFilesDir().getPath();
return setupWithFolderAndLogfile(path,
path + "/output.log");
}
private static boolean setupWithFolderAndLogfile(String folderPath, String logfilePath) {
HashMap<String, Serializable> data = new HashMap<>();
data.put("folder", folderPath);
data.put("logfile", logfilePath);
JSONObject res = executeEndpoint("/initialization", data);
return !isErrorResponse(res);
}
public static JSONObject executeEndpoint(String path, HashMap<String, Serializable> data) {
JSONObject jsonData = new JSONObject(data);
String res = callCoreEndpointJNI(path, jsonData.toString());
JSONObject ret;
try {
ret = new JSONObject(res);
} catch (JSONException e) {
Log.e("Error while converting core return statement to json.");
Log.e(e.getMessage());
Log.e(e.toString());
ret = new JSONObject();
try {
ret.put("error", e.toString());
} catch (JSONException e2) {
Log.e("Error while putting the error into the return json.");
Log.e(e2.getMessage());
Log.e(e2.toString());
}
}
return ret;
}
public static void executeEndpointAsync(String path, HashMap<String, Serializable> data, AsyncCallback callback) {
// Create and start the task.
AsyncCoreTask task = new AsyncCoreTask();
task.setCallback(callback);
task.setPath(path);
task.setData(data);
task.execute();
}
public static boolean isErrorResponse(JSONObject data) {
return data.has("error");
}
public static boolean isSuccess(JSONObject data) {
String res;
try {
res = data.getString("status");
} catch (JSONException e) {
Log.w(String.format("JsonData is no status message: %s", data.toString()));
res = "no";
}
return res.equals("success");
}
public static Error errorFromResponse(JSONObject data) {
String errorDescr;
if (isErrorResponse(data)) {
try {
errorDescr = data.getString("error");
} catch (JSONException e) {
errorDescr = e.getMessage();
errorDescr = "There was an error while getting the error message: " + errorDescr;
}
} else {
errorDescr = "Data contains no error message.";
}
return new Error(errorDescr);
}
private static native String callCoreEndpointJNI(String jPath, String jData);
/**
* Log a message to the core
* @param level The level of the message. A number from 0 (DEBUG) to 5 (FATAL)
* @param message The message to log
*/
public static native void log(int level, String message);
}
Additionally,here the cpp definition of the entrypoint that then calls our core library:
#include <jni.h>
#include <string>
#include "pluspoints.h"
extern "C"
JNIEXPORT jstring JNICALL
Java_ch_fidelisfactory_pluspoints_Core_Wrapper_callCoreEndpointJNI(
JNIEnv* env,
jobject /* this */,
jstring jPath,
jstring jData) {
const jsize pathLen = env->GetStringUTFLength(jPath);
const char* pathChars = env->GetStringUTFChars(jPath, (jboolean *)0);
const jsize dataLen = env->GetStringUTFLength(jData);
const char* dataChars = env->GetStringUTFChars(jData, (jboolean *)0);
std::string path(pathChars, (unsigned long) pathLen);
std::string data(dataChars, (unsigned long) dataLen);
std::string result = pluspoints_execute(path.c_str(), data.c_str());
env->ReleaseStringUTFChars(jPath, pathChars);
env->ReleaseStringUTFChars(jData, dataChars);
return env->NewStringUTF(result.c_str());
}
extern "C"
JNIEXPORT void JNICALL Java_ch_fidelisfactory_pluspoints_Core_Wrapper_log(
JNIEnv* env,
jobject,
jint level,
jstring message) {
const jsize messageLen = env->GetStringUTFLength(message);
const char *messageChars = env->GetStringUTFChars(message, (jboolean *)0);
std::string cppMessage(messageChars, (unsigned long) messageLen);
pluspoints_log((PlusPointsLogLevel)level, cppMessage);
}
Here, the pluspoints.h file:
/**
* Copyright 2017 FidelisFactory
*/
#ifndef PLUSPOINTSCORE_PLUSPOINTS_H
#define PLUSPOINTSCORE_PLUSPOINTS_H
#include <string>
/**
* Send a request to the Pluspoints core.
* @param path The endpoint you wish to call.
* @param request The request.
* @return The return value from the executed endpoint.
*/
std::string pluspoints_execute(std::string path, std::string request);
/**
* The different log levels at which can be logged.
*/
typedef enum {
LEVEL_VERBOSE = 0,
LEVEL_DEBUG = 1,
LEVEL_INFO = 2,
LEVEL_WARNING = 3,
LEVEL_ERROR = 4,
LEVEL_FATAL = 5
} PlusPointsLogLevel;
/**
* Log a message with the info level to the core.
*
* The message will be written in the log file in the core.
* @note The core needs to be initialized before this method can be used.
* @param level The level at which to log the message.
* @param logMessage The log message
*/
void pluspoints_log(PlusPointsLogLevel level, std::string logMessage);
#endif //PLUSPOINTSCORE_PLUSPOINTS_H
android:extractNativeLibs="true"to see how it goes. – Digestiblepluspoints.htoo. – CatechuloadLibrarycall https://mcmap.net/q/502789/-jni-hello-world-unsatisfied-link-error Try this out – Guyton