josm exception for a way without node

[katpatuka]

When uploading an .osm file I encountered an josm exception: Way -3487748 must have at least one node. Looking in the -osm file it contained:

  <way id='-3487748' action='modify' visible='true'>
  </way>

without any <node>. No idea how that happened. I had to manually remove the code from the .osm file before I could continue uploading. At least such a case shouldn't produce an exception - a warning or a silent skip could IMO be enough. A way without nodes is not a way ;)

[Don-vip]

Thanks for your report, however your ticket is incomplete and therefore not helpful in its current form.

Please add all needed information according to this list:

• The required parts of the Status Report from your JOSM.
  • Please, use Report Bug from Help menu and copy & paste.
• Describe what behaviour you expected.
• Describe what did happen instead.
• Describe if and how the issue is reproducible.
• Add any relevant information like error messages or screenshots.

To ensure that all technical relevant information is contained, create new tickets by clicking in JOSMs Main Menu on Help → Report Bug.

Remember: This is a generic notice so we don't need to write the same stuff again and again. It may only apply in parts to the specific case!

[katpatuka]

Not reproducible for now... output from console:

2020-03-24 10:51:41.828 WARNING: Error header "Precondition failed: Way -3487748 must have at least one node" did not match with an expected pattern
2020-03-24 10:51:41.828 SEVERE: org.openstreetmap.josm.io.OsmApiException: ResponseCode=412, Error Header=<Precondition failed: Way -3487748 must have at least one node>
org.openstreetmap.josm.io.OsmApiException: ResponseCode=412, Error Header=<Precondition failed: Way -3487748 must have at least one node>
        at org.openstreetmap.josm.io.OsmApi.sendRequest(OsmApi.java:726)
        at org.openstreetmap.josm.io.OsmApi.sendRequest(OsmApi.java:633)
        at org.openstreetmap.josm.io.OsmApi.uploadDiff(OsmApi.java:567)
        at org.openstreetmap.josm.io.OsmServerWriter.uploadChangesInChunks(OsmServerWriter.java:174)
        at org.openstreetmap.josm.io.OsmServerWriter.uploadOsm(OsmServerWriter.java:218)
        at org.openstreetmap.josm.gui.io.UploadPrimitivesTask.realRun(UploadPrimitivesTask.java:261)
        at org.openstreetmap.josm.gui.io.AsynchronousUploadPrimitivesTask.realRun(AsynchronousUploadPrimitivesTask.java:129)
        at org.openstreetmap.josm.gui.PleaseWaitRunnable.doRealRun(PleaseWaitRunnable.java:94)
        at org.openstreetmap.josm.gui.PleaseWaitRunnable.run(PleaseWaitRunnable.java:142)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at java.lang.Thread.run(Unknown Source)

2020-03-24 10:51:41.859 SEVERE: Precondition violation - org.openstreetmap.josm.gui.widgets.HtmlPanel[,0,0,0x0,invalid,l
ayout=java.awt.BorderLayout,alignmentX=0.0,alignmentY=0.0,border=,flags=9,maximumSize=,minimumSize=,preferredSize=]

[skyper]

Would you please add the first blocks of you status report, e.g. that we know the JOSM version and installed plugins. See wikitr:/Help/Action/ShowStatusReport what is important and what should be kept private.

[katpatuka]

URL:https://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2020-02-26 10:50:27 +0100 (Wed, 26 Feb 2020)
Build-Date:2020-02-26 09:52:41
Revision:15937
Relative:URL: ^/trunk

Identification: JOSM/1.5 (15937 en) Windows XP 32-Bit
OS Build number: Microsoft Windows XP (1.511.1 () (Obsolete data - do not use))
Memory Usage: 765 MB / 989 MB (437 MB allocated, but free)
Java version: 1.8.0_151-b12, Oracle Corporation, Java HotSpot(TM) Client VM
Screen: \Display0 1360x768
Maximum Screen Size: 1360x768
Dataset consistency test: No problems found

Plugins:
+ FastDraw (35256)
+ PicLayer (35313)
+ apache-commons (35092)
+ ejml (35122)
+ ext_tools (35248)
+ geochat (35248)
+ geotools (35169)
+ jaxb (35092)
+ jts (35122)
+ measurement (35248)
+ opendata (35330)
+ reverter (35313)
+ utilsplugin2 (35334)
+ waydownloader (35092)
+ wikipedia (1.1.3)

Tagging presets:
+ D:\belgelerim\mypreset-latest.xml

Last errors/warnings:
- E: Error header: The node with the id 7309020234 has already been deleted
- W: Node 'Jindong ‎(32.612542, 105.548157) [id: 7,309,020,234]' is already deleted. Skipping object in upload.
- W: java.net.SocketTimeoutException: Read timed out. Cause: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out. Cause: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out. Cause: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out. Cause: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out. Cause: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out. Cause: java.net.SocketTimeoutException: Read timed out
- W: java.net.SocketTimeoutException: Read timed out. Cause: java.net.SocketTimeoutException: Read timed out
- W: Already here java.net.SocketTimeoutException: Read timed out

[Don-vip]

We can't magically guess what happened if even you can't find a way to reproduce.

Note also you're running an outdated version of Java with an obsolete and unsupported operating system. It doesn't help to bring stability.

[katpatuka]

suspicious data found by validator

[katpatuka]

Don't worry - xp is very stable: never crashes ;)

I can of course reproduce it manually. Create an .osm file as follows and try to upload it.

<?xml version='1.0' encoding='UTF-8'?>
<osm version='0.6' generator='JOSM'>
  <way id='-3487748' action='modify' visible='true'>
  </way>
</osm>

Validator pops up (see attachment) but you continue trying to upload and are interrupted by exception.

[stoecker]

Well, so you ignore the warning and wonder why the server rejects the data later: Well that's why it is marked as error.

Question is how have you been able to produce a way without a single node?