This is caused by some feature type missing the keywords element in the configuration, and the WFS 1.1 capabilities encoder being unable to cope with it:
Caused by: java.lang.NullPointerException
at org.geoserver.wfs.CapabilitiesTransformer$WFS1_1$CapabilitiesTranslator1_1.keywords(CapabilitiesTransformer.java:1447)
at org.geoserver.wfs.CapabilitiesTransformer$WFS1_1$CapabilitiesTranslator1_1.featureType(CapabilitiesTransformer.java:1229)
at org.geoserver.wfs.CapabilitiesTransformer$WFS1_1$CapabilitiesTranslator1_1.featureTypeList(CapabilitiesTransformer.java:1124)
at org.geoserver.wfs.CapabilitiesTransformer$WFS1_1$CapabilitiesTranslator1_1.encode(CapabilitiesTransformer.java:825)
at org.geotools.xml.transform.TransformerBase$XMLReaderSupport.parse(TransformerBase.java:702)
The WFS 1.0 encoder on the other side is NPE safe.
This is caused by some feature type missing the keywords element in the configuration, and the WFS 1.1 capabilities encoder being unable to cope with it:
The WFS 1.0 encoder on the other side is NPE safe.