Add rethrowing exception, from Apache Commons Lang.

Author: FireMasterK

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/YoutubeStreamExtractor.java

@@ -33,6 +33,7 @@
 import org.schabi.newpipe.extractor.services.youtube.YoutubeThrottlingDecrypter;
 import org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeChannelLinkHandlerFactory;
 import org.schabi.newpipe.extractor.stream.*;
+import org.schabi.newpipe.extractor.utils.ExceptionUtils;
 import org.schabi.newpipe.extractor.utils.JsonUtils;
 import org.schabi.newpipe.extractor.utils.Parser;
 import org.schabi.newpipe.extractor.utils.Utils;
@@ -799,8 +800,12 @@ public void onFetchPage(@Nonnull final Downloader downloader)
             nextFuture.get();
             fetchAndroidFuture.get();
             fetchDesktopSts.get();
-        } catch (InterruptedException | ExecutionException e) {
-            e.printStackTrace();
+        } catch (InterruptedException ignored) {
+        } catch (ExecutionException e) {
+            final Throwable cause = e.getCause();
+            if (cause != null) {
+                ExceptionUtils.rethrow(cause);
+            }
         }
     }
 

extractor/src/main/java/org/schabi/newpipe/extractor/utils/ExceptionUtils.java

@@ -0,0 +1,16 @@
+package org.schabi.newpipe.extractor.utils;
+
+public class ExceptionUtils {
+
+    // From Apache Commons Lang: https://commons.apache.org/proper/commons-lang/javadocs/api-3.10/org/apache/commons/lang3/exception/ExceptionUtils.html#rethrow-java.lang.Throwable-
+
+    public static <R> R rethrow(final Throwable throwable) {
+        // claim that the typeErasure invocation throws a RuntimeException
+        return ExceptionUtils.<R, RuntimeException>typeErasure(throwable);
+    }
+
+    @SuppressWarnings("unchecked")
+    private static <R, T extends Throwable> R typeErasure(final Throwable throwable) throws T {
+        throw (T) throwable;
+    }
+}