Sounds like you are on the right tract - not closing streams is a common
issue both in using GeoTools (and in writing GeoTools - although we try and
stay on top of that!).
If you could proceed with your debug hunt we would be keen to hear where
streams are being left open.
I assume you are closing any iterators you use by hand, and disposing of
maps and datastore correctly? Are you managing DataStores yourself or
making use of a Registry?
--
Jody
Jody Garnett
On Tue, Dec 2, 2014 at 2:32 AM, Andy Turner <a.g.d.tur...@leeds.ac.uk>
wrote:
> Hi geotools-devel,
>
> Apologies if I should be posting this elsewhere.
>
> I am hitting an error/exception when running a program that writes and
> reads a reasonably large number (hundreds) of shapefiles.
>
> The error message is:
>
> WARNING: Could not aquire ESRI(tm) Shapefiles
> (*.shp):java.lang.NullPointerException
> java.lang.NullPointerException
> at
> org.geotools.data.shapefile.files.ShpFiles.findExistingFile(ShpFiles.java:210)
> at
> org.geotools.data.shapefile.files.ShpFiles.init(ShpFiles.java:183)
> at
> org.geotools.data.shapefile.files.ShpFiles.<init>(ShpFiles.java:139)
> at
> org.geotools.data.shapefile.ShapefileDataStoreFactory.createDataStore(ShapefileDataStoreFactory.java:184)
> at
> org.geotools.data.shapefile.ShapefileDataStoreFactory.createDataStore(ShapefileDataStoreFactory.java:303)
> at
> org.geotools.data.FileDataStoreFinder.getDataStore(FileDataStoreFinder.java:95)
> at
> org.geotools.data.FileDataStoreFinder.getDataStore(FileDataStoreFinder.java:69)
>
> I am using GeoTools 12.1, Maven and Netbeans.
>
> The program will get past the part where this error is thrown if I
> read/write fewer shapefiles previously. (And so as a work around I can
> split up my processing into smaller bits and run these to get the output I
> want, but that is not ideal.)
>
> I think the problem is something to do with streams perhaps not being
> finalised and closed and that the program is running out of handles of some
> stripe.
>
> I have thought to check the GeoTools source file logic for closing all the
> streams in shapefile writing. To do this I have created a fork of GeoTools
> in GitHub and built things locally with Maven so that I have a copy of the
> GeoTools source java files.
>
> I am thinking also to set up a new testing project in Netbeans so I can
> debug the program by going into the GeoTools source files. Maybe it is
> sensible to do this all in one Netbeans project...
>
> BTW, I add the data from each shapefile into its own Layer which is added
> to a MapContent. After I have the image I want I then predispose and
> dispose of each Layer and dispose of the MapContent.
>
> So that is where I am with this, I just thought I post this message before
> I went any further in case anyone has time to give me some advice.
>
> What I have discovered might be a known issue and I expect there is a
> issue tracker that I could look at to know, but I am a bit unsure of where
> the right place to look is.
>
> Anyway, thanks for GeoTools.
>
> Best wishes,
>
> Andy
>
>
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