I assume there is a serious bug in the austria.osm.bz2 currently. See here the error output. It compiles 3 out of 7 tiles correctly, and then chokes on the 4. tile. I'm sure there is an error in the country extract (with the same command all other country extracts of europe compiled fine - the overflow is not related to split size (I reduced it drastically just to test, and yesterdays osm.bz2 extract compiled just fine). If someone wants to have a look at it, I could upload the broken file (only the splitted part that breaks mapbuilding - it's 12.1 MB) to my server. Maybe it's useful for bugtracking for you, I don't know (happens on rev 1053 and/or 1052 I did not testrun with older revisions)... D:\Garmin\mkgmap_680>start /b /wait java -jar -Xmx4800M mkgmap.jar --latin1 --lower-case --no-sorted-roads --ignore-maxspeeds --ignore-turn-restrictions --remove-short-arcs --add-pois-to-areas --location-autofill=1 --route --net --country-abbr=at --country-name=austria --gmapsupp --mapname=63660000 636600*.osm.gz Exception in thread "main" java.lang.StackOverflowError at java.util.regex.Pattern$BmpCharProperty.match(Unknown Source) at java.util.regex.Pattern$GroupHead.match(Unknown Source) at java.util.regex.Pattern$Branch.match(Unknown Source) at java.util.regex.Pattern$BranchConn.match(Unknown Source) at java.util.regex.Pattern$GroupTail.match(Unknown Source) at java.util.regex.Pattern$Curly.match0(Unknown Source) at java.util.regex.Pattern$Curly.match(Unknown Source) at java.util.regex.Pattern$BmpCharProperty.match(Unknown Source) at java.util.regex.Pattern$GroupHead.match(Unknown Source) at java.util.regex.Pattern$Branch.match(Unknown Source) at java.util.regex.Pattern$Branch.match(Unknown Source) at java.util.regex.Pattern$BranchConn.match(Unknown Source) at java.util.regex.Pattern$GroupTail.match(Unknown Source) at java.util.regex.Pattern$Curly.match0(Unknown Source) at java.util.regex.Pattern$Curly.match(Unknown Source) at java.util.regex.Pattern$GroupHead.match(Unknown Source) at java.util.regex.Pattern$Branch.match(Unknown Source) at java.util.regex.Pattern$Branch.match(Unknown Source) at java.util.regex.Pattern$BmpCharProperty.match(Unknown Source) at java.util.regex.Pattern$Start.match(Unknown Source) at java.util.regex.Matcher.search(Unknown Source) at java.util.regex.Matcher.find(Unknown Source) at java.util.Formatter.parse(Unknown Source) at java.util.Formatter.format(Unknown Source) at java.util.Formatter.format(Unknown Source) at uk.me.parabola.imgfmt.app.Coord.toDegreeString(Coord.java:191) at uk.me.parabola.imgfmt.app.net.RouteCenter.<init>(RouteCenter.java:42) at uk.me.parabola.imgfmt.app.net.NOD1Part.toRouteCenter(NOD1Part.java:286) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:242) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) ......... This continues for around 200 lines, then breaks operation. Different output with -ea: D:\Garmin\mkgmap_680>start /b /wait java -jar -ea -Xmx4800M mkgmap.jar --latin1 --lower-case --no-sorted-roads --ignore-maxspeeds --ignore-turn-restrictions --remove-short-arcs --add-pois-to-area s --location-autofill=1 --description=main1_openmtbmap_at --route --net --country-abbr=at --country-name=austria --gmapsupp --mapname=63660000 636600*.osm.gz Exception in thread "main" java.lang.AssertionError: trying to get center of empty BBox at uk.me.parabola.imgfmt.app.net.NOD1Part$BBox.center(NOD1Part.java:141) at uk.me.parabola.imgfmt.app.net.NOD1Part.toRouteCenter(NOD1Part.java:286) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:242) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.imgfmt.app.net.NOD1Part.subdivide(NOD1Part.java:266) at uk.me.parabola.mkgmap.general.RoadNetwork.splitCenters(RoadNetwork.java:161) at uk.me.parabola.mkgmap.general.RoadNetwork.getCenters(RoadNetwork.java:166) at uk.me.parabola.mkgmap.build.MapBuilder.makeMap(MapBuilder.java:186) at uk.me.parabola.mkgmap.main.MapMaker.makeMap(MapMaker.java:90) at uk.me.parabola.mkgmap.main.MapMaker.makeMap(MapMaker.java:56) at uk.me.parabola.mkgmap.main.Main.processFilename(Main.java:151) at uk.me.parabola.mkgmap.CommandArgsReader$Filename.processArg(CommandArgsReader.java:237) at uk.me.parabola.mkgmap.CommandArgsReader.readArgs(CommandArgsReader.java:120) at uk.me.parabola.mkgmap.main.Main.main(Main.java:92)