[Patch] Error loading way-history

[PHerison]

What steps will reproduce the problem?

1. Load ​https://api.openstreetmap.org/api/0.6/map?bbox=-68.2694131,45.6256347,-68.25921,45.6300164
2. Select way Molunkus Stream (93286904)
3. Load History (Ctrl+H)

What is the expected result?

Open History-Viewer-Window

What happens instead?

Error-Message

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

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2025-07-11 10:12:51 +0200 (Fri, 11 Jul 2025)
Revision:19423
Build-Date:2025-07-12 01:30:35
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (19423 de) Windows 11 64-Bit
OS Build number: Windows 10 Pro 24H2 (26100)
Memory Usage: 4096 MB / 8192 MB (3374 MB allocated, but free)
Java version: 24.0.1+9-30, Oracle Corporation, OpenJDK 64-Bit Server VM
Look and Feel: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
Screen: \Display0 2560x1440x32bpp@165Hz (scaling 1.00×1.00) \Display1 2560x1440x32bpp@59Hz (scaling 1.00×1.00)
Maximum Screen Size: 2560×1440
Best cursor sizes: 16×16→32×32, 32×32→32×32
System property file.encoding: UTF-8
System property sun.jnu.encoding: Cp1252
Locale info: de_DE
Numbers with default locale: 1234567890 -> 1234567890
VM arguments: [--add-exports=java.base/sun.security.action=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.plugins.jpeg=ALL-UNNAMED, --add-exports=java.desktop/com.sun.imageio.spi=ALL-UNNAMED]
Dataset consistency test: No problems found

Plugins:
+ FixAddresses (36438)
+ Mapillary (1813)
+ PicLayer (269)
+ RoadSigns (36438)
+ apache-commons (36438)
+ apache-http (36438)
+ buildings_tools (36438)
+ editgpx (36438)
+ ejml (36438)
+ ext_tools (36438)
+ geotools (36438)
+ imagery_offset_db (36438)
+ jackson (36438)
+ jaxb (36438)
+ jna (36438)
+ jts (36438)
+ log4j (36438)
+ photoadjust (36438)
+ reverter (36447)
+ terracer (36438)
+ turnrestrictions (36438)
+ undelete (36438)
+ utilsplugin2 (36438)
+ waydownloader (36438)

Tagging presets:
+ https://josm.openstreetmap.de/josmfile?page=Presets/OneClick&zip=1
+ <josm.pref>\presets.xml

Map paint styles:
+ https://josm.openstreetmap.de/josmfile?page=Styles/TigerReviewedNo&zip=1

Last errors/warnings:
- 00006.570 W: Not a single layer for the name 'Bing Sat': []
- 00006.571 W: Not a single layer for the name 'Bing Sat': []
- 00006.571 W: Not a single layer for the name 'Bing Sat': []
- 00006.572 W: Not a single layer for the name 'Bing Sat': []
- 00006.572 W: Not a single layer for the name 'Bing Sat': []
- 00006.572 W: Not a single layer for the name 'Bing Sat': []
- 00006.572 W: Not a single layer for the name 'Bing Sat': []
- 00006.572 W: Not a single layer for the name 'Bing Sat': []
- 00006.573 W: Not a single layer for the name 'Bing Sat': []
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version=1 V lat=45.6254396,lon=-68.2658404}, {Node id=7877038890 version=1 V lat=45.6253871,lon=-68.2660818}, {Node id=7877038889 version=1 V lat=45.625177,lon=-68.2662642}, {Node id=7877038888 version=1 V lat=45.6249257,lon=-68.266232}, {Node id=7877038887 version=1 V lat=45.6226972,lon=-68.2652235}, {Node id=7877038886 version=1 V lat=45.6204611,lon=-68.2645369}, {Node id=7877038885 version=1 V lat=45.619328,lon=-68.2641399}, {Node id=7877038884 version=1 V lat=45.6179397,lon=-68.2637322}, {Node id=7877038883 version=1 V lat=45.6173094,lon=-68.2633889}, {Node id=7877038882 version=1 V lat=45.6167616,lon=-68.2630134}, {Node id=7877038881 version=1 V lat=45.6165364,lon=-68.262949}, {Node id=7877038880 version=1 V lat=45.6162963,lon=-68.2629597}, {Node id=7877038879 version=1 V lat=45.6161087,lon=-68.2631314}, {Node id=7877038878 version=1 V lat=45.6157935,lon=-68.2641721}, {Node id=7877038877 version=1 V lat=45.6155158,lon=-68.2646442}, {Node id=7877038876 version=1 V 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lat=45.5571492,lon=-68.226927}, {Node id=1081479014 version=1 V lat=45.5568111,lon=-68.2265783}, {Node id=1081479311 version=1 V lat=45.5565407,lon=-68.2262726}, {Node id=1081478973 version=1 V lat=45.5562102,lon=-68.2257737}, {Node id=1081479002 version=1 V lat=45.5557707,lon=-68.2251246}, {Node id=1081478951 version=1 V lat=45.55538,lon=-68.2244487}, {Node id=1081478989 version=1 V lat=45.555087,lon=-68.2240624}, {Node id=1081478915 version=1 V lat=45.5547415,lon=-68.2236654}, {Node id=1081478985 version=1 V lat=45.5545349,lon=-68.2233704}, {Node id=1081479072 version=1 V lat=45.554302,lon=-68.2229949}, {Node id=1081479198 version=1 V lat=45.554054,lon=-68.2223941}, {Node id=1081479162 version=1 V lat=45.5538362,lon=-68.222142}, {Node id=1081479144 version=1 V lat=45.553607,lon=-68.221922}, {Node id=1081478922 version=1 V lat=45.5534044,lon=-68.2217933}, {Node id=1081478921 version=1 V lat=45.5531339,lon=-68.2217396}, {Node id=1081479206 version=1 V lat=45.5528672,lon=-68.2218147}, {Node id=1081479197 version=1 V lat=45.5526118,lon=-68.2220132}, {Node id=1081479037 version=1 V lat=45.5523188,lon=-68.2222707}, {Node id=1081479279 version=1 V lat=45.5521572,lon=-68.2223941}, {Node id=1081479322 version=1 V lat=45.5519619,lon=-68.2224585}, {Node id=1081479395 version=1 V lat=45.5517023,lon=-68.2225295}, {Node id=9890218431 version=1 V lat=45.5513572,lon=-68.2225467}, {Node id=9890218432 version=1 V lat=45.5509111,lon=-68.2225378}, {Node id=9890218433 version=1 V lat=45.5506632,lon=-68.2226971}, {Node id=9890218434 version=1 V lat=45.5504758,lon=-68.2231214}]} not found in HistoryDataSet

[GerdP]

I can reproduce the problem: No history window, no error message in the dialog, long error message in the console saying that data is missing. I'll try to find out if this is an error in the server data or in JOSM.

[GerdP]

Something in the changeset comment for cs 167608541 seems to be the problem. When I try to revert that cs with the reverter plugin I see an error message Changeset tag value is too long
​https://www.openstreetmap.org/changeset/167608541

I guess a utf8 problem with the special character before the text "Strava Heatmap" is the cause.

[GerdP]

@stoecker: The String.length() method returns 259 for this comment, but obviously the OSM server calculates a different length. Any idea how to handle this?
Code in Changeset.java:

        if (value != null && value.length() > MAX_CHANGESET_TAG_LENGTH) {
            throw new IllegalArgumentException("Changeset tag value is too long: "+value);
        }

[GerdP]

Besides: With this small patch JOSM shows at least a popup with an error text:

src/org/openstreetmap/josm/io/OsmChangesetParser.java

@@ -285 +285 @@
             return parser.getChangesets();
         } catch (ParserConfigurationException | SAXException e) {
             throw new IllegalDataException(e.getMessage(), e);
-        } catch (IOException e) {
+        } catch (IOException | IllegalArgumentException e) {
             throw new IllegalDataException(e);
         } finally {
             progressMonitor.finishTask();

[stoecker]

According to the wiki the limit is still 255 in UTF-8/Unicode.

​https://wiki.openstreetmap.org/wiki/API_v0.6#Maximum_string_lengths

Question is if this is still true for the code? Maybe it silently supports more.

In any case I'd simply strip it down to 255.

[GerdP]

Did you analyse the bytes before "Strava" in the comment? It seems to me that 19 bytes are rendered as a single symbol. So, something special happens and I guess the same can happen with normal tag values, so we have to make sure that JOSM can handle this.

[GerdP]

I talk about this symbol in the comment: ⚪

[stoecker]

Replying to GerdP:

Did you analyse the bytes before "Strava" in the comment? It seems to me that 19 bytes are rendered as a single symbol. So, something special happens and I guess the same can happen with normal tag values, so we have to make sure that JOSM can handle this.

I copied the string into my text editor and it does the same: Also gets 259 als length.

Only 0xE2 0x9A 0xAA (U+26AA) is the bubble. In front of it is 4 times 0xF3 0xA0 0x80 0xA0, which is Tag Space ​https://www.fileformat.info/info/unicode/char/e0020/index.htm and has no real meaning. Dropping that will reduce the length to 255 ;-)

Maybe the server has a bug and doesn't count that as character?

[GerdP]

Can you open a ticket? Can't remember how or where to do that :(

[stoecker]

​https://github.com/openstreetmap/openstreetmap-website/issues/6350

That does not solve the JOSM issue thought ;-) We need to handle it properly. I'd suggest two solutions:
a) Drop 0xE0020 from the string
b) Cut strings longer than 255

[GerdP]

Thanks for opening the ticket.
The question is where (in what class) this could happen. While I see no big problem with data that is only displayed, what do we do if a normal object has a tag like description=* that contains such a value or another too long string and the object is uploaded after an update?

[stoecker]

To be clear:
In my eyes the string violates the API rules and thus should also in the future be illegal. I'd only add a workaround, so that the string gets sanitized into the acceptable 255 characters range for further processing when the data comes from the API. That means the workaround should only be done handling the input. I would not extend this to other places except there is need for that.

uploaded after an update

Nothing changes, we still only upload 255 character strings. This broken string is bad and not uploadable.

[GerdP]

OK, this patch seems to do the trick for the changeset parser (which is also used by the reverter plugin):

src/org/openstreetmap/josm/io/OsmChangesetParser.java

@@ -211 +211 @@
             case "tag":
                 String key = atts.getValue("k");
                 String value = atts.getValue("v");
-                current.put(key, value);
+                // see #24446: drop Unicode Character 'TAG SPACE' (U+E0020)
+                current.put(key, value.replace("\uDB40\uDC20", ""));
                 break;
             case "discussion":
                 break;

[stoecker]

In the OSM ticket Tom Hughes checked it and in principle the length of 255 for the string can be verified. Java and KDE kate sees that a bit different ;-)

Tom adds:

You probably want to use String.codePointCount instead of the normal length function.

If that would help, we can be in sync with the server algorithm.

[GerdP]

Yes, helps, but code is more complex. Something like this:

        if (value != null && value.length() > MAX_CHANGESET_TAG_LENGTH
                && value.codePointCount(0, value.length()) > MAX_CHANGESET_TAG_LENGTH) {
            throw new IllegalArgumentException("Changeset tag value is too long: " + value);
        }

If performance is not an issue we may remove the simple check for value.length()
There are a few more places where this change is needed...

[stoecker]

I think that looks good. Usually the first will catch. I'd add a note linking to this ticket.

[stoecker]

There are a few more places where this change is needed...

Make an Utils.checkCodePointCount(String s, int len) of it? Also solves the complexity issue ;-)

[GerdP]

Hmm, how should that method handle a null value? Most times we need the actual count for user feedback, e.g. for the validator tests.

[GerdP]

It seems we have a long standing bug in class ApiPreconditionCheckerHook. It checks if key.length() is too large and then possibly tries to truncate value.

[stoecker]

Replying to GerdP:

Hmm, how should that method handle a null value?

Return 0 for null :-)

Most times we need the actual count for user feedback, e.g. for the validator tests.

A second function which returns the value? Utils.getCodePointCount(String s)

But do not forget, who does the code decides: I only do suggestions...

It seems we have a long standing bug in class ApiPreconditionCheckerHook. It checks if key.length() is too large and then possibly tries to truncate value.

One of these "why the hell did nobody find this before"?

[GerdP]

I really wonder if this code is a good idea. A method called checkMaxNodes() is certainly not the right place to possibly manipulate the tag values, even if it is private.
Besides that it should probably check both the key and the value, similar to TagChecker.
Or maybe the manipilation part should be removed because it never worked, anyway.

[GerdP]

Implement new methods getCodePointCount() and checkCodePointCount(), use them instead of checking String.length() against a max value

[GerdP]

Please review the patch.
I've kept the code to truncate the value, I did not add code (yet) to check the key length as well, as this also would add translated strings.
Further issues that I found:

• Some messages just say "String is too long", others report something like "longer than {x} characters".
• Some of our dialogs don't allow to paste or create the problematic comment as they simply check agains String.lenght(), see e.g. AutoCompletingTextField.setMaxChars(). The patch doesn't change that.

[stoecker]

Already had a look. Looks good to me.

[GerdP]

OK, thanks. I'll do some performance tests reg. the changes in TagChecker. If nothing serious pops up I'll commit the patch later.

[GerdP]

In 19437/josm:

fix #24446: Error loading way-history
Turned out that the OSM server counts the number of unicode code points, not the number of characters when checking the maximum lengths of keys and tags in tags.

• implement new methods in Util to calculate the number of code points or check agains a given limit
• fix long standing bug in ApiPreconditionCheckerHook.java which was introduced with r2906 (key -> value)

[stoecker]

Congratulations for fixing a 15 years old bug 👏

[pnorman]

If you want to truncate a string you can't just cut it off at a certain number of code points. You can end up truncating in the middle of a grapheme cluster.

[GerdP]

Do you have an idea how to find the right place to cut? I've not found anything obvious in the String class.

[stoecker]

I found this ​https://horstmann.com/unblog/2023-10-03/index.html

[GerdP]

new method to truncate a string to a given maximum of grapheme clusters

[GerdP]

The patch implements a possible solution. It changes only the one call in ApiPreconditionCheckerHook. The problematic method Utils.shortenString() is used in many places and I assume we also have many places were a String.substring() call is used to truncate a string.
New ticket?

[pnorman]

​https://adam-p.ca/blog/2025/04/string-length/ is one article I found that goes over the different ways and problems. It's not language specific so it doesn't recommend any libraries.

[stoecker]

Replying to GerdP:

The patch implements a possible solution. It changes only the one call in ApiPreconditionCheckerHook. The problematic method Utils.shortenString() is used in many places and I assume we also have many places were a String.substring() call is used to truncate a string.
New ticket?

Hmm, I'm not sure we should introduce another function. I'd rather think shortenString should be adapted, so that it cuts before a grapheme cluster without changing the semantics (i.e. compared to now it would drop some additional bytes). Would that be feasible?

[GerdP]

I first coded it like that but then I thought that some callers may really expect to get a string with a maximum number of chars, so I'd prefer to keep the impact small and have a new method.
I might be wrong there. We have lots of code where dialog fields are truncated to a maximum length where they should truncate to a maximum number of grapheme clusters. I don't know yet how to find all of them. Maybe only the places where String.substring(int beginIndex,int endIndex) is used need to be checked, probably many more. Too much for me.

[stoecker]

Replying to GerdP:

I first coded it like that but then I thought that some callers may really expect to get a string with a maximum number of chars, so I'd prefer to keep the impact small and have a new method.

Well yes, but cutting in the middle is always wrong, that's why I thought keep the logic (i.e. shorten get's called with the number of chars), but ensures that it does not cut in the middle of a grapheme cluster. So it calculates the char split position and if that's inside a grapheme cluster use the nearest position before. That way you keep the function as is, but prevent bad broken output.

In our example that would mean we would reduce the string a bit more than strictly necessary - If you think that's not good enough, your new function can be used explicit in that place (i.e. the tag length).

Again, you decide ;-)

[GerdP]

I think we need both methods, one that cuts to the given length, the other which cuts to given maximum number of grapheme clusters.
Maybe only the second is really needed, but I think that has to verified very carefully.
You are right, both should never cut inside a grapheme cluster.