NPE in FileWatcher.start (Linux)

[darwish.d.d@…]

What steps will reproduce the problem?

1. Just launch JOSM

What is the expected result?

What happens instead?

Please provide any additional information below. Attach a screenshot if possible.

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2017-02-02 01:22:52 +0100 (Thu, 02 Feb 2017)
Build-Date:2017-02-02 02:33:28
Revision:11526
Relative:URL: ^/trunk

Identification: JOSM/1.5 (11526 en) Linux Ubuntu 14.04.5 LTS
Memory Usage: 302 MB / 3500 MB (195 MB allocated, but free)
Java version: 1.8.0_111-8u111-b14-3~14.04.1-b14, Oracle Corporation, OpenJDK 64-Bit Server VM
Screen: :0.0 1920x1080, :0.1 1920x1080
Maximum Screen Size: 1920x1080
Java package: openjdk-8-jre:amd64-8u111-b14-3~14.04.1
Java ATK Wrapper package: libatk-wrapper-java:all-0.30.4-4
VM arguments: [-Djosm.restart=true, -Djava.net.useSystemProxies=true]

Plugins:
+ DirectUpload
+ editgpx
+ imagery_offset_db

Last errors/warnings:
- E: java.io.IOException: User limit of inotify instances reached or too many open files
- E: Handled by bug report queue: java.lang.NullPointerException


=== REPORTED CRASH DATA ===
BugReportExceptionHandler#handleException:
No data collected.

Warning issued by: BugReportExceptionHandler#handleException

=== STACK TRACE ===
Thread: main (1)
java.lang.NullPointerException
	at org.openstreetmap.josm.io.FileWatcher.start(FileWatcher.java:54)
	at org.openstreetmap.josm.Main.initialize(Main.java:510)
	at org.openstreetmap.josm.gui.MainApplication.main(MainApplication.java:335)

[Don-vip]

In 11589/josm:

fix #14391 - robustness to Linux systems preventing file watcher to start because of incorrect kernel inotify watch configuration