Fix JabRef dying silently without enough inotify instances (#4875)

* Logs exceptions in file monitor as errors

An exception in the initialization of DefaultFileUpdateMonitor is now logged as error

* Describes fix for issue #4874

CHANGELOG.md

@@ -65,6 +65,7 @@ We refer to [GitHub issues](https://github.com/JabRef/jabref/issues) by using `#
 
 
 ### Fixed
+- We fixed an issue where JabRef died silently for the user without enough inotify instances [#4874](https://github.com/JabRef/jabref/issues/4847)
 - We fixed an issue where corresponding groups are sometimes not highlighted when clicking on entries [#3112](https://github.com/JabRef/jabref/issues/3112)
 - We fixed an issue where custom exports could not be selected in the 'Export (selected) entries' dialog [#4013](https://github.com/JabRef/jabref/issues/4013)
 - Italic text is now rendered correctly. https://github.com/JabRef/jabref/issues/3356

src/main/java/org/jabref/gui/util/DefaultFileUpdateMonitor.java

@@ -59,7 +59,7 @@ public void run() {
                 Thread.yield();
             }
         } catch (Throwable e) {
-            LOGGER.debug("FileUpdateMonitor has been interrupted. Terminating...", e);
+            LOGGER.error("FileUpdateMonitor has been interrupted.", e);
         }
     }