OutOfMemoryError: Java heap space

Generating OruxMaps sqlite atlas, after around 50%
16GB memory in system

Version: Mobile Atlas Creator (MOBAC) 2.0.0 (2357)
Platform: Linux (4.15.0-38-generic) (gnome)
Distribution name: xenial
Java VM: Java HotSpot(TM) 64-Bit Server VM (1.8.0_191-b12)
Max heap size: 2731.00 MiB
CPU cores: 8

Thread: ImagePreLoadThread4

Error hierarchy:
OutOfMemoryError: Java heap space

java.lang.OutOfMemoryError: Java heap space
at java.awt.image.DataBufferByte.<init>(DataBufferByte.java:92)
at java.awt.image.ComponentSampleModel.createDataBuffer(ComponentSampleModel.java:445)
at java.awt.image.Raster.createWritableRaster(Raster.java:941)
at javax.imageio.ImageTypeSpecifier.createBufferedImage(ImageTypeSpecifier.java:1074)
at javax.imageio.ImageReader.getDestination(ImageReader.java:2892)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.readInternal(JPEGImageReader.java:1082)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.read(JPEGImageReader.java:1050)
at javax.imageio.ImageIO.read(ImageIO.java:1448)
at javax.imageio.ImageIO.read(ImageIO.java:1352)
at mobac.program.atlascreators.tileprovider.DownloadedTileProvider.getTileImage(DownloadedTileProvider.java:58)
at mobac.program.atlascreators.tileprovider.CacheTileProvider.internalGetTileImage(CacheTileProvider.java:87)
at mobac.program.atlascreators.tileprovider.CacheTileProvider$CachedTile.loadImage(CacheTileProvider.java:233)
at mobac.program.atlascreators.tileprovider.CacheTileProvider$PreLoadThread.run(CacheTileProvider.java:165)</init>