Hi Carlos, I think there are at least two problems: 1) something is wrong with the unicode String comparison, but I have no clue how it should work. The tile contains > 10000 city POI, but mkgmap detects only 145 different names with unicode. Method Mdr5Record.isSameByName(Collator collator, Mdr5Record other) returns true for names which look very different to me. 2) We don't use the method Mdr5Record.isSameByName() when section Mdr25 is written (Cities are sorted by country and then by the mdr5 city record number). Instead normal java String.equals() is used and thus the list contains the expected > 10000 entries. This list requires a two-byte value in the index. The crash happens because we try to write the position in the mdr25 list with only one byte cause of this code in Mdr29.java: int size25 = sizes.getSize(5); // NB appears to be size of 5 (cities), not 25 (cities with country). The comment already shows that this is probably only correct when boths lists have the same number of entries. I hope Steve or Ticker have an idea what's wrong. Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Gerd Petermann <gpetermann_muenchen@hotmail.com> Gesendet: Freitag, 15. Oktober 2021 10:09 An: Development list for mkgmap Betreff: Re: [mkgmap-dev] java.lang.AssertionError while building index from unicode tiles Hi Carlos, I can reproduce the crash. Not sure where to fix this yet... Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Carlos Dávila <carlos@alternativaslibres.org> Gesendet: Donnerstag, 14. Oktober 2021 18:33 An: Development list for mkgmap Betreff: [mkgmap-dev] java.lang.AssertionError while building index from unicode tiles Hi all I'm getting error below while building index from this tile: https://files.mkgmap.org.uk/download/523/31177029.o5m. Minimum mkgmap options triggering the error are: java -jar mkgmap-trunk.jar --bounds=bounds.zip --index --unicode 31177029.o5m Another tile from the same splitter run also fails but all other 65 of 67 build fine. With --code-page=936 they all build fine. Command output: Exception in thread "main" java.lang.AssertionError: 10586 at uk.me.parabola.imgfmt.app.FileBackedImgFileWriter.putNu(FileBackedImgFileWriter.java:215) at uk.me.parabola.imgfmt.app.mdr.Mdr29.writeSectData(Mdr29.java:94) at uk.me.parabola.imgfmt.app.mdr.MDRFile.writeSection(MDRFile.java:424) at uk.me.parabola.imgfmt.app.mdr.MDRFile.writeSections(MDRFile.java:388) at uk.me.parabola.imgfmt.app.mdr.MDRFile.write(MDRFile.java:270) at uk.me.parabola.mkgmap.combiners.MdrBuilder.onFinish(MdrBuilder.java:331) at uk.me.parabola.mkgmap.main.Main.endOptions(Main.java:690) at uk.me.parabola.mkgmap.CommandArgsReader.readArgs(CommandArgsReader.java:126) at uk.me.parabola.mkgmap.main.Main.mainStart(Main.java:147) at uk.me.parabola.mkgmap.main.Main.main(Main.java:118) _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk https://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev