Hi! There is an issue with GeoServer Web Cache I've been battling with for some time now. A year or two. The solution which always works, is to remove and create the buggy layer in the Geoserver, and GWC issue is automagically fixed.
So, we are generating PNG layers from PostGIS. EPSG:900913, using via Leaflet as a WMS layer. As a last resort, I've manually entered the bounding box (2285772.8938 7460253.9606 3177334.3918 8006931.5869), which corresponds to covered territory with a small extension. Native SRS is EPSG:3059. Mostly layer works OK, but once in a while, it misses a tile. For example, a feature is shown on one zoom level fine. However, when I zoom in, tiles don't show that feature anymore. It affects some features, as others are visible on all zoom levels. Following request generates tile successfully: service=WMS&request=GetMap&layers=test-layer&styles=&format=image%2Fpng&transparent=true&version=1.1.1&width=256&height=256&srs=EPSG%3A900913&bbox=2739503.0937407175,7866287.45488406,2778638.852222727,7905423.213366073 This one returns a blank tile with a GWC log entry of "INFO [util.ResponseUtils] - Read 425 from blank PNG file (expected 425)." https://kartet1.lmt.lv/geoserver/gwc/service/wms?&service=WMS&request=GetMap&layers=test-layer&styles=&format=image%2Fpng&transparent=true&version=1.1.1&width=256&height=256&srs=EPSG%3A900913&bbox=2759070.972981722,7885855.33412507,2778638.852222727,7905423.213366073 However, most of the blank tiles are generated without any entries in GWC log file. Truncating layer does not fix the issue (I can confirm that the layer physically gets truncated and files are removed). It can be fixed only by removing layer (or layer group) from GeoServer altogether and re-adding it back again. This was not a big issue when layers were mostly static. Now, however, it's a pain, since they have to be regenerated nightly. So, if there I'm unable to get to the bottom of this bug, only way would be to automate layer deletion and recreation via GeoServer's REST API, which is not something I'm looking forward to... -- Kaspars http://laacz.lv/
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