JNI exception properties

app/src/main/java/eu/faircode/email/Log.java

@@ -1838,7 +1838,7 @@ public class Log {
 
         try (FileWriter out = new FileWriter(file, true)) {
             out.write(BuildConfig.VERSION_NAME + BuildConfig.REVISION + " " + new Date() + "\r\n");
-            out.write(ex + "\r\n" + new ThrowableWrapper(ex).getStackTraceString() + "\r\n");
+            out.write(ex + "\r\n" + new ThrowableWrapper(ex).getSafeStackTraceString() + "\r\n");
         } catch (IOException e) {
             Log.e(e);
         }

app/src/main/java/eu/faircode/email/ThrowableWrapper.java

@@ -28,6 +28,16 @@ public class ThrowableWrapper extends Throwable {
     private final Throwable ex;
     private final String msg;
 
+    public static native String jni_get_safe_message(Throwable ex);
+
+    public static native String jni_to_safe_string(Throwable ex);
+
+    public static native String jni_get_safe_stack_trace_string(Throwable ex);
+
+    static {
+        System.loadLibrary("fairemail");
+    }
+
     ThrowableWrapper(String msg) {
         this.ex = new Throwable();
         this.msg = msg;
@@ -39,7 +49,7 @@ public class ThrowableWrapper extends Throwable {
     }
 
     public String getSafeMessage() {
-        return (TextUtils.isEmpty(msg) ? super.getMessage() : msg);
+        return (TextUtils.isEmpty(msg) ? jni_get_safe_message(ex) : msg);
     }
 
     public String getSafeMessageOrName() {
@@ -47,12 +57,12 @@ public class ThrowableWrapper extends Throwable {
         return (msg == null ? ex.getClass().getName() : msg);
     }
 
-    public String getStackTraceString() {
+    public String getSafeStackTraceString() {
-        return android.util.Log.getStackTraceString(ex);
+        return jni_get_safe_stack_trace_string(ex);
     }
 
     public String toSafeString() {
-        return ex.toString();
+        return jni_to_safe_string(ex);
     }
 
     @Nullable
@@ -64,7 +74,7 @@ public class ThrowableWrapper extends Throwable {
     @Nullable
     @Override
     public String getLocalizedMessage() {
-        return getMessage();
+        return ex.getLocalizedMessage();
     }
 
     @NonNull

app/src/main/jni/fairemail.cc

@@ -23,6 +23,33 @@ void log_android(int prio, const char *fmt, ...) {
     }
 }
 
+extern "C"
+JNIEXPORT jstring JNICALL
+Java_eu_faircode_email_ThrowableWrapper_jni_1get_1safe_1message(
+        JNIEnv *env, jclass clazz, jthrowable ex) {
+    jclass cls = env->FindClass("java/lang/Throwable");
+    jmethodID mid = env->GetMethodID(cls, "getMessage", "()Ljava/lang/String;");
+    return (jstring) env->CallObjectMethod(ex, mid);
+}
+
+extern "C"
+JNIEXPORT jstring JNICALL
+Java_eu_faircode_email_ThrowableWrapper_jni_1to_1safe_1string(
+        JNIEnv *env, jclass clazz, jthrowable ex) {
+    jclass cls = env->FindClass("java/lang/Throwable");
+    jmethodID mid = env->GetMethodID(cls, "toString", "()Ljava/lang/String;");
+    return (jstring) env->CallObjectMethod(ex, mid);
+}
+
+extern "C"
+JNIEXPORT jstring JNICALL
+Java_eu_faircode_email_ThrowableWrapper_jni_1get_1safe_1stack_1trace_1string(
+        JNIEnv *env, jclass clazz, jthrowable ex) {
+    jclass cls = env->FindClass("android/util/Log");
+    jmethodID mid = env->GetStaticMethodID(cls, "getStackTraceString",
+                                           "(Ljava/lang/Throwable;)Ljava/lang/String;");
+    return (jstring) env->CallStaticObjectMethod(cls, mid, ex);
+}
 extern "C"
 JNIEXPORT jobject JNICALL