Restarting the machine did not solve the problem. What helped me was turning
off the monitor right after starting the program: the SEVERE messages just
disappeared (I didn’t check if the IllegalArgumentException is still thrown,
however).
Running the program under Linux did not solve the problem either, though the
SEVERE messages changed. Here the output I get when the monitor is on:
SEVERE: The following locker still has a lock: read on
file:/tmp/maps/Streets.shp by org.geotools.data.shapefile.shp.ShapefileReader
SEVERE: The following locker still has a lock: read on
file:/tmp/maps/Streets.shx by org.geotools.data.shapefile.shp.IndexFile
SEVERE: The following locker still has a lock: read on filetmp/maps/Streets.dbf
by org.geotools.data.shapefile.dbf.DbaseFileReader
Exception in thread "main" java.lang.IllegalArgumentException: Expected
requestor org.geotools.data.shapefile.dbf.DbaseFileReader@499fcbfd to have
locked the url but it does not hold the lock for the URL
at
org.geotools.data.shapefile.files.ShpFiles.unlockRead(ShpFiles.java:429)
at
org.geotools.data.shapefile.files.FileChannelDecorator.implCloseChannel(FileChannelDecorator.java:149)
at
java.nio.channels.spi.AbstractInterruptibleChannel.close(AbstractInterruptibleChannel.java:115)
at
org.geotools.data.shapefile.dbf.DbaseFileReader.close(DbaseFileReader.java:286)
at
org.geotools.data.shapefile.ShapefileFeatureReader.close(ShapefileFeatureReader.java:251)
at
org.geotools.data.store.ContentFeatureCollection$WrappingFeatureIterator.close(ContentFeatureCollection.java:154)
at SmallerExample.main(SmallerExample.java:9)
------------------------------------------------------------------------------
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