I'm getting lots of log messages with the subject's error message.
here's a partial stack trace from viewing a layer group with about 30
geotiffs

version 2.8.1
org.geotools.resources.image.ColorUtilities.findColorINdex :506
org.geotools.render.lite.gridcoverage2d.GridCoverageRenderer.renderImage:822

Layer previews work for each individual geotiff, but the layer group
fails to render (just a white box where the map should be). Not sure
if the two are related or not.


I also see
org.geoserver.platform.ServiceException: Rendering process failed
org.geoserver.wms.map.RenderedImageMapOutputFormat

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