#314 MOBAC crashing when producing JPEG tiles for two maps in parallel

[Michael Bechtold]

When creating two (or more) maps in parallel that produce JPEGs, at least one will crash with below execption.
It seems some thread data is mixed up somehow. Looking into the code, I could not find a smoking gun, though.

java.lang.IllegalStateException: Attempt to use instance of com.sun.imageio.plugins.jpeg.JPEGImageWriter@24cded50 locked on thread Thread[AtlasThread 4,6,main] from thread Thread[AtlasThread 3,6,main]
at com.sun.imageio.plugins.jpeg.JPEGImageWriter.setThreadLock(Unknown Source)
at com.sun.imageio.plugins.jpeg.JPEGImageWriter.write(Unknown Source)
at mobac.program.tiledatawriter.TileImageJpegDataWriter.processImage(TileImageJpegDataWriter.java:107)
at mobac.program.atlascreators.tileprovider.ConvertedRawTileProvider.getTileData(ConvertedRawTileProvider.java:48)
at mobac.program.atlascreators.AbstractSQLite.createTiles(AbstractSQLite.java:105)
at mobac.program.atlascreators.RMapsSQLite.createMap(RMapsSQLite.java:97)
at mobac.program.AtlasThread.createMap(AtlasThread.java:360)
at mobac.program.AtlasThread.createAtlas(AtlasThread.java:205)
at mobac.program.AtlasThread.run(AtlasThread.java:122)

[r_x]

Thanks for reporting this issue. Could you please add more info on your OS and the used Java-VM?

[Michael Bechtold]

This is under W10, but also happened under W7, if I recall correctly /# of maps was smaller back then, so I took the pain :-)

java version "1.8.0_161"
Java(TM) SE Runtime Environment (build 1.8.0_161-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.161-b12, mixed mode)

[Michael Bechtold]

BTW: it needs larger map generation runs to produce the error. Each one producing 500 MB+ maps should do.

[Michael Bechtold]

One more (off topic) thing: could this be interesting re. missing labels ?
https://github.com/mapsforge/mapsforge/commit/6f8312f43724a84ccc1dbc962dbeb7a0c076061e

[Michael Bechtold]

BINGO - works like a charm. TXs a lot, Robert!