When you say blank, is the expected content missing, or are some of the
normal map controls also missing? For recent releases of geoServer it
seems that the system has a new/different dependency for the OpenLayers
library used for preview - if you are accessing geoServer via a proxy,
you will need a new path to be recognized that routes this traffic to
the appropriate tomcat. I ended up adding (for apache httpd)
ProxyPassMatch ^/openlayers3/(.*)$
ajp://localhost:8009/geoserver/openlayers3/$1
I'm not sure if this is a bug in geoServer (Windows builds), or some
other underlying change (tomcat, ....), but either the system is now
expecting a distinct (root dir) install of openlayers, or part of the
path was omitted by geoserver in its calls. I haven't checked this for
direct tomcat use (no proxy), but suspect even there the shortened path
will cause issues.
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