NullPointerException in MapillaryTrafficSignDownloadThread

[Polyglot]

What steps will reproduce the problem?

1. Go to an area with many pictures. JOSM slows down a lot.
2. Go to another area 2000km away. JOSM reports a crash

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: 2016-05-18 23:27:06 +0200 (Wed, 18 May 2016)
Build-Date:2016-05-19 01:32:41
Revision:10253
Relative:URL: ^/trunk

Identification: JOSM/1.5 (10253 en) Windows 7 64-Bit
Memory Usage: 508 MB / 2889 MB (164 MB allocated, but free)
Java version: 1.8.0_91-b14, Oracle Corporation, Java HotSpot(TM) 64-Bit Server VM
Dataset consistency test: No problems found

Plugins:
- CustomizePublicTransportStop (0.2)
- Mapillary (32158)
- OpeningHoursEditor (32158)
- RoadSigns (32177)
- apache-commons (32158)
- apache-http (32158)
- buildings_tools (32158)
- geochat (32158)
- livegps (32158)
- measurement (32158)
- reverter (32158)
- scripting (30722)
- surveyor (32158)
- tag2link (31923)
- terracer (32158)
- todo (29154)
- tofix (203)
- turnrestrictions (32158)
- undelete (32158)
- utilsplugin2 (32158)
- wikipedia (32182)

Last errors/warnings:
- E: java.net.UnknownHostException: api.openstreetmap.org
- W: org.openstreetmap.josm.io.OsmTransferException: Could not connect to the OSM server. Please check your internet connection.. Cause: java.net.UnknownHostException: api.openstreetmap.org
- E: java.lang.NullPointerException
- W: java.net.SocketTimeoutException: Read timed out
- E: java.lang.NullPointerException

java.lang.NullPointerException
	at org.glassfish.json.JsonObjectBuilderImpl$JsonObjectImpl.getString(JsonObjectBuilderImpl.java:199)
	at org.openstreetmap.josm.plugins.mapillary.io.download.MapillaryTrafficSignDownloadThread.run(MapillaryTrafficSignDownloadThread.java:71)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)

[nokutu]

Hey Polyglot, in which country were you when this happened? Mapillary recently added traffic signs in more countries and, as they are not in the plugin yet, they may cause exception.

[anonymous]

Ticket #12884 has been marked as a duplicate of this ticket.

[Don-vip]

Ticket #13459 has been marked as a duplicate of this ticket.

[floscher]

The downloading of traffic signs has been completely revised for ​v1.5.0 and ​all newer releases.

For this change the class MapillaryTrafficSignDownloadThread has been replaced with DetectionDownloadRunnable and JsonDetectionDecoder. So this exception should no longer occur with newer versions.