HI all,

I have problem with image mosaic plugin using geotiff.
The geoserver version is 2.8.1.
The same configurartion works with tiff copied from snow time series examples.
in the page "Add Raster Data Source" I saw the following error:
"Could not list layers for this store, an error occurred retrieving them: Failed to create reader from file:workspaces/.... and hints null"

I think there's a problem involving geotiff data tags.
This is the exception encoutered

2016-04-12 12:27:37,001 ERROR [imagemosaic.Utils] -
java.lang.NullPointerException
at org.geotools.gce.imagemosaic.RasterManager$SpatialDomainManager.prepareCoverageSpatialElements(RasterManager.java:203) at org.geotools.gce.imagemosaic.RasterManager$SpatialDomainManager.<init>(RasterManager.java:178) at org.geotools.gce.imagemosaic.RasterManager.initialize(RasterManager.java:1472) at org.geotools.gce.imagemosaic.ImageMosaicConfigHandler.indexingPostamble(ImageMosaicConfigHandler.java:410) at org.geotools.gce.imagemosaic.ImageMosaicDirectoryWalker$MosaicDirectoryWalker.<init>(ImageMosaicDirectoryWalker.java:132) at org.geotools.gce.imagemosaic.ImageMosaicDirectoryWalker.run(ImageMosaicDirectoryWalker.java:196)
        at org.geotools.gce.imagemosaic.Utils.createMosaic(Utils.java:359)
        at org.geotools.gce.imagemosaic.Utils.checkSource(Utils.java:1237)
at org.geotools.gce.imagemosaic.ImageMosaicReader.initReaderFromURL(ImageMosaicReader.java:516) at org.geotools.gce.imagemosaic.ImageMosaicReader.<init>(ImageMosaicReader.java:468) at org.geotools.gce.imagemosaic.ImageMosaicFormat.getReader(ImageMosaicFormat.java:483) at org.geotools.gce.imagemosaic.ImageMosaicFormat.getReader(ImageMosaicFormat.java:103) at org.geoserver.catalog.ResourcePool.getGridCoverageReader(ResourcePool.java:1441) at org.geoserver.catalog.ResourcePool.getGridCoverageReader(ResourcePool.java:1369) at org.geoserver.catalog.impl.CoverageStoreInfoImpl.getGridCoverageReader(CoverageStoreInfoImpl.java:59)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
at org.geoserver.catalog.impl.ModificationProxy.invoke(ModificationProxy.java:146)

this is the listgeo output for the tif file

Geotiff_Information:
   Version: 1
   Key_Revision: 1.2
   Tagged_Information:
      ModelTransformationTag (4,4):
         7.80859375        0                 0 981591
         0                 -6.51432291666667 0 5538963
         0                 0                 0                 0
         0                 0                 0                 1
      End_Of_Tags.
   Keyed_Information:
      GTModelTypeGeoKey (Short,1): ModelTypeProjected
      GTRasterTypeGeoKey (Short,1): RasterPixelIsArea
      GeographicTypeGeoKey (Short,1): GCS_WGS_84
      ProjectedCSTypeGeoKey (Short,1): User-Defined
      PCSCitationGeoKey (Ascii,24): "WGS84 / Google Mercator"
      ProjectionGeoKey (Short,1): User-Defined
      ProjCoordTransGeoKey (Short,1): CT_Mercator
      ProjLinearUnitsGeoKey (Short,1): Linear_Meter
      ProjLinearUnitSizeGeoKey (Double,1): 1
      ProjNatOriginLongGeoKey (Double,1): 0
      ProjNatOriginLatGeoKey (Double,1): 0
      ProjFalseEastingGeoKey (Double,1): 0
      ProjFalseNorthingGeoKey (Double,1): 0
      ProjScaleAtNatOriginGeoKey (Double,1): 1
      End_Of_Keys.
   End_Of_Geotiff.

Projection Method: CT_Mercator
   ProjNatOriginLatGeoKey: 0.000000 (  0d 0' 0.00"N)
   ProjNatOriginLongGeoKey: 0.000000 (  0d 0' 0.00"E)
   ProjScaleAtNatOriginGeoKey: 1.000000
   ProjFalseEastingGeoKey: 0.000000 m
   ProjFalseNorthingGeoKey: 0.000000 m
GCS: 4326/WGS 84
Datum: 6326/World Geodetic System 1984
Ellipsoid: 7030/WGS 84 (6378137.00,6356752.31)
Prime Meridian: 8901/Greenwich (0.000000/  0d 0' 0.00"E)
Projection Linear Units: 9001/metre (1.000000m)

Corner Coordinates:
Upper Left    (  981591.000, 5538963.000)  (  8d49' 4.02"E, 44d39'55.73"N)
Lower Left    (  981591.000, 5533960.000)  (  8d49' 4.02"E, 44d38' 0.24"N)
Upper Right   (  989587.000, 5538963.000)  (  8d53'22.60"E, 44d39'55.73"N)
Lower Right   (  989587.000, 5533960.000)  (  8d53'22.60"E, 44d38' 0.24"N)
Center        (  985589.000, 5536461.500)  (  8d51'13.31"E, 44d38'57.99"N)

Thanks

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