Seems to be still some fastutil.jar problem around? I tried to use the splitter.jar from the mkgmap download page WITHOUT the modified fastutil.jar (latest as of today): Exception in thread "main" java.lang.NoClassDefFoundError: it/unimi/dsi/fastutil/longs/Long2ShortFunction It does work however if I use the modified fastutil.jar. Just a quick speed comparison (i have 8GB RAM on my server, so RAM is abundant): splitter trunk Austria: 40 seconds (however with modified fastutil.jar, don't think it matters on speed however). splitter_patched with optimize-mem=33 seconds splitter _patched without optimime-mem=34 seconds I am right now doing some more tries on other countries (bigger ones, as it doesn't matter that much on too small countries where it is anyhow fast). Here is the complete log of it failing: c:\OpenMTBMap\maps>java -Xmx6600m -jar c:\openmtbmap\splitter.jar --max-nodes=1250000 --output=pbf --max-areas=128 --geonames-file=cities15000 --description=austria --cache=cache --mapid=63650000 aust ria.osm.pbf cache=cache description=austria geonames-file=cities15000 legacy-mode=false mapid=63650000 max-areas=128 max-nodes=1250000 max-threads=4 (auto) mixed=false no-trim=false optimize-mem=false output=pbf output-dir= overlap=2000 resolution=13 split-file= status-freq=120 write-kml= Elapsed time: 0s Memory: Current 122MB (1MB used, 121MB free) Max 5866MB Time started: Thu Nov 17 16:07:34 CET 2011 Map is being split for resolution 13: - area boundaries are aligned to 0x800 map units - areas are multiples of 0x1000 map units wide and high Processing austria.osm.pbf Bounding box 9.52678 46.36851 17.16273 49.02403 10'000'000 nodes processed... id=1174172078 1'000'000 ways processed... id=110462196 in 1 file Time: Thu Nov 17 16:07:42 CET 2011 Exact map coverage is (46.36850595474243,9.526777267456055) to (49.0240216255188,17.162725925445557) Trimmed and rounded map coverage is (46.40625,9.4921875) to (49.04296875,17.138671875) Splitting nodes into areas containing a maximum of 1'250'000 nodes each... Area (46.4501953125,9.4921875) to (47.2412109375,10.8984375) contains 540'283 nodes. DONE! Area (47.2412109375,9.4921875) to (47.7685546875,10.8984375) contains 737'377 nodes. DONE! Area (46.7138671875,10.8984375) to (47.2412109375,12.216796875) contains 525'664 nodes. DONE! Area (47.2412109375,10.8984375) to (48.1201171875,12.216796875) contains 1'125'411 nodes. DONE! Area (46.40625,12.216796875) to (47.4609375,13.0078125) contains 639'704 nodes. DONE! Area (46.40625,13.0078125) to (47.4609375,13.88671875) contains 1'106'723 nodes. DONE! Area (47.4609375,12.216796875) to (47.8125,13.88671875) contains 1'112'114 nodes. DONE! Area (47.8125,12.392578125) to (48.955078125,13.88671875) contains 1'058'689 nodes. DONE! Area (46.40625,13.88671875) to (47.021484375,15.205078125) contains 754'775 nodes. DONE! Area (47.021484375,13.88671875) to (47.8125,15.205078125) contains 801'876 nodes. DONE! Area (46.494140625,15.205078125) to (47.197265625,16.962890625) contains 933'138 nodes. DONE! Area (47.197265625,15.205078125) to (47.8125,15.908203125) contains 568'885 nodes. DONE! Area (47.197265625,15.908203125) to (47.8125,17.138671875) contains 756'400 nodes. DONE! Area (47.8125,13.88671875) to (48.1640625,15.205078125) contains 708'241 nodes. DONE! Area (48.1640625,13.88671875) to (48.33984375,15.205078125) contains 1'221'308 nodes. DONE! Area (48.33984375,13.88671875) to (49.04296875,15.205078125) contains 768'745 nodes. DONE! Area (47.8125,15.205078125) to (49.04296875,15.99609375) contains 1'244'722 nodes. DONE! Area (47.8125,15.99609375) to (48.1640625,17.138671875) contains 550'724 nodes. DONE! Area (48.1640625,15.99609375) to (49.04296875,17.138671875) contains 1'039'634 nodes. DONE! 19 areas: Area 63650000 covers (0x211000,0xad000) to (0x219000,0xc1000) AT-Graz Area 63650001 covers (0x220000,0xad000) to (0x22e000,0xb6000) AT-Sankt Polten Area 63650002 covers (0x219000,0xb5000) to (0x220000,0xc3000) HU-Szombathely Area 63650003 covers (0x220000,0x9e000) to (0x224000,0xad000) AT-Steyr Area 63650004 covers (0x213800,0x7c000) to (0x219800,0x8b000) IT-Bressanone Area 63650005 covers (0x210000,0x9e000) to (0x217000,0xad000) AT-Klagenfurt am Woerthersee Area 63650006 covers (0x21c000,0x8b000) to (0x220000,0x9e000) AT-Salzburg Area 63650007 covers (0x224000,0xb6000) to (0x22e000,0xc3000) AT-Vienna Area 63650008 covers (0x210800,0x6c000) to (0x219800,0x7c000) CH-Chur Area 63650009 covers (0x219000,0xad000) to (0x220000,0xb5000) AT-Kapfenberg Area 63650010 covers (0x210000,0x8b000) to (0x21c000,0x94000) AT-Saalfelden am Steinernen Meer Area 63650011 covers (0x226000,0x9e000) to (0x22e000,0xad000) CZ-Ceske Budejovice Area 63650012 covers (0x219800,0x7c000) to (0x223800,0x8b000) AT-Innsbruck Area 63650013 covers (0x217000,0x9e000) to (0x220000,0xad000) AT-Leoben Area 63650014 covers (0x220000,0x8d000) to (0x22d000,0x9e000) DE-Passau Area 63650015 covers (0x220000,0xb6000) to (0x224000,0xc3000) SK-Bratislava Area 63650016 covers (0x219800,0x6c000) to (0x21f800,0x7c000) DE-Kempten (Allgaeu) Area 63650017 covers (0x224000,0x9e000) to (0x226000,0xad000) AT-Linz Area 63650018 covers (0x210000,0x94000) to (0x21c000,0x9e000) AT-Villach Writing out split osm files Thu Nov 17 16:07:42 CET 2011 Processing 19 areas in a single pass Area 63650000 covers (0x211000,0xad000) to (0x219000,0xc1000) AT-Graz Area 63650001 covers (0x220000,0xad000) to (0x22e000,0xb6000) AT-Sankt Polten Area 63650002 covers (0x219000,0xb5000) to (0x220000,0xc3000) HU-Szombathely Area 63650003 covers (0x220000,0x9e000) to (0x224000,0xad000) AT-Steyr Area 63650004 covers (0x213800,0x7c000) to (0x219800,0x8b000) IT-Bressanone Area 63650005 covers (0x210000,0x9e000) to (0x217000,0xad000) AT-Klagenfurt am Woerthersee Area 63650006 covers (0x21c000,0x8b000) to (0x220000,0x9e000) AT-Salzburg Area 63650007 covers (0x224000,0xb6000) to (0x22e000,0xc3000) AT-Vienna Area 63650008 covers (0x210800,0x6c000) to (0x219800,0x7c000) CH-Chur Area 63650009 covers (0x219000,0xad000) to (0x220000,0xb5000) AT-Kapfenberg Area 63650010 covers (0x210000,0x8b000) to (0x21c000,0x94000) AT-Saalfelden am Steinernen Meer Area 63650011 covers (0x226000,0x9e000) to (0x22e000,0xad000) CZ-Ceske Budejovice Area 63650012 covers (0x219800,0x7c000) to (0x223800,0x8b000) AT-Innsbruck Area 63650013 covers (0x217000,0x9e000) to (0x220000,0xad000) AT-Leoben Area 63650014 covers (0x220000,0x8d000) to (0x22d000,0x9e000) DE-Passau Area 63650015 covers (0x220000,0xb6000) to (0x224000,0xc3000) SK-Bratislava Area 63650016 covers (0x219800,0x6c000) to (0x21f800,0x7c000) DE-Kempten (Allgaeu) Area 63650017 covers (0x224000,0x9e000) to (0x226000,0xad000) AT-Linz Area 63650018 covers (0x210000,0x94000) to (0x21c000,0x9e000) AT-Villach Writing out split osm files Thu Nov 17 16:07:42 CET 2011 Processing 19 areas in a single pass (46.494140625,15.205078125) to (47.197265625,16.962890625) (47.8125,15.205078125) to (49.04296875,15.99609375) (47.197265625,15.908203125) to (47.8125,17.138671875) (47.8125,13.88671875) to (48.1640625,15.205078125) (46.7138671875,10.8984375) to (47.2412109375,12.216796875) (46.40625,13.88671875) to (47.021484375,15.205078125) (47.4609375,12.216796875) to (47.8125,13.88671875) (48.1640625,15.99609375) to (49.04296875,17.138671875) (46.4501953125,9.4921875) to (47.2412109375,10.8984375) (47.197265625,15.205078125) to (47.8125,15.908203125) (46.40625,12.216796875) to (47.4609375,13.0078125) (48.33984375,13.88671875) to (49.04296875,15.205078125) (47.2412109375,10.8984375) to (48.1201171875,12.216796875) (47.021484375,13.88671875) to (47.8125,15.205078125) (47.8125,12.392578125) to (48.955078125,13.88671875) (47.8125,15.99609375) to (48.1640625,17.138671875) (47.2412109375,9.4921875) to (47.7685546875,10.8984375) (48.1640625,13.88671875) to (48.33984375,15.205078125) (46.40625,13.0078125) to (47.4609375,13.88671875) Starting pass 1 of 1, processing 19 areas (63650000 to 63650018) Exception in thread "main" java.lang.NoClassDefFoundError: it/unimi/dsi/fastutil/longs/Long2ShortFunction at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(Unknown Source) at java.security.SecureClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.access$100(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at uk.me.parabola.splitter.SplitProcessor.<init>(SplitProcessor.java:87) at uk.me.parabola.splitter.Main.writeAreas(Main.java:371) at uk.me.parabola.splitter.Main.split(Main.java:193) at uk.me.parabola.splitter.Main.start(Main.java:121) at uk.me.parabola.splitter.Main.main(Main.java:110) Caused by: java.lang.ClassNotFoundException: it.unimi.dsi.fastutil.longs.Long2ShortFunction at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) ... 17 more