Print unhandled exceptions to stderr by default (like ThreadGroup does).

Author: bretthoerner

CHANGES

@@ -2,6 +2,7 @@ Version 1.6.7
 -------------
 
 - Add Automatic-Module-Name to manifest so we have basic Java 9 support.
+- Print unhandled exceptions to stderr by default (like ThreadGroup does).
 
 Version 1.6.6
 -------------

sentry/src/main/java/io/sentry/SentryUncaughtExceptionHandler.java

@@ -58,9 +58,15 @@ public void uncaughtException(Thread thread, Throwable thrown) {
             }
         }
 
+        // taken from ThreadGroup#uncaughtException
         if (defaultExceptionHandler != null) {
             // call the original handler
             defaultExceptionHandler.uncaughtException(thread, thrown);
+        } else if (!(thrown instanceof ThreadDeath)) {
+            // CHECKSTYLE.OFF: RegexpSinglelineJava
+            System.err.print("Exception in thread \"" + thread.getName() + "\" ");
+            thrown.printStackTrace(System.err);
+            // CHECKSTYLE.ON: RegexpSinglelineJava
         }
     }