GeoServer 2.12.x with plugins fails to show layer previews

Description

I have a GeoServer 2.12.x with the following plugins:

geoserver-2.12-SNAPSHOT-csw-plugin.zip
geoserver-2.12-SNAPSHOT-monitor-plugin.zip
geoserver-2.12-SNAPSHOT-printing-plugin.zip
geoserver-2.12-SNAPSHOT-querylayer-plugin.zip
geoserver-2.12-SNAPSHOT-wps-plugin.zip
geoserver-2.12-SNAPSHOT-ogr-wfs-plugin.zip
geoserver-2.12-SNAPSHOT-css-plugin.zip
geoserver-2.12-SNAPSHOT-control-flow-plugin.zip
geoserver-2.12-SNAPSHOT-pyramid-plugin.zip
geoserver-2.12-SNAPSHOT-gdal-plugin.zip
geoserver-2.12-SNAPSHOT-status-monitoring-plugin.zip
geoserver-2.12-SNAPSHOT-geofence-server-plugin.zip
geoserver-2.12-SNAPSHOT-gwc-sqlite-plugin.zip
geoserver-2.12-SNAPSHOT-geopkg-plugin.zip
geoserver-2.12-SNAPSHOT-backup-restore-plugin.zip

and the imageio-ext-gdal-bindings-1.9.2.jar

It was working fine up to commit https://github.com/geoserver/geoserver/commit/6a9676b4b6d04dc0d65446f4b491be5681df4977

After that, the layer preview page stopped working, and all the CSW requests started to fail.

This is the wicket stack trace:

Environment

Ubuntu 12.04
Java version "1.8.0_91"
Apache Tomcat/7.0.26

Assignee

Unassigned

Reporter

Gnafu

Triage

None

Fix versions

None

Affects versions

Priority

Medium
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