see the following stack trace: I used useMemoryMappedBuffer = true for the
ShapeFileDataStore/ShapeFileReader,
since the shape file is very large (several GBs), the FileChannel.map() ran
out of memory.
this is a bit strange to me: FileChannel.map() only maps a virtual memory
space onto the file, it does not need to immediately allocate memory for
the mapping, right? then why does JVM run out of memory? anyhow, this is
probably a problem to be addressed since some people will likely choose
memoryMapped option
Caused by: java.io.IOException: Map failed
at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:758)
at org.geotools.data.shapefile.ShpFiles.map(ShpFiles.java:979)
at
org.geotools.data.shapefile.FileChannelDecorator.map(FileChannelDecorator.java:80)
at
org.geotools.data.shapefile.shp.ShapefileReader.init(ShapefileReader.java:345)
at
org.geotools.data.shapefile.shp.ShapefileReader.<init>(ShapefileReader.java:251)
at
org.geotools.data.shapefile.ShapefileDataStore.openShapeReader(ShapefileDataStore.java:558)
at
org.geotools.data.shapefile.ShapefileDataStore.readAttributes(ShapefileDataStore.java:785)
at
org.geotools.data.shapefile.ShapefileDataStore.getSchema(ShapefileDataStore.java:743)
at
org.geotools.data.AbstractFileDataStore.getFeatureSource(AbstractFileDataStore.java:77)
at my.company.Application.<init>(GeoFinder.java:85)
... 35 more
Caused by: java.lang.OutOfMemoryError: Map failed
at sun.nio.ch.FileChannelImpl.map0(Native Method)
at sun.nio.ch.FileChannelImpl.map(FileChannelImpl.java:755)
... 46 more
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