Thanks Andrea,
That is a good point - we never tested after it was committed to the master at 
2.12.
I will take a look at that.
Here is the full stack trace:

<?xml version="1.0" encoding="UTF-8" standalone="no"?><!DOCTYPE 
ServiceExceptionReport SYSTEM 
"http://openmaps.gov.bc.ca/geo/schemas/wms/1.1.1/WMS_exception_1_1_1.dtd";> 
<ServiceExceptionReport version="1.1.1" >   <ServiceException>
      javax.xml.transform.TransformerException: 
javax.xml.transform.TransformerException: java.lang.NullPointerException
javax.xml.transform.TransformerException: java.lang.NullPointerException
java.lang.NullPointerException
Details:
org.geoserver.platform.ServiceException: 
javax.xml.transform.TransformerException: 
javax.xml.transform.TransformerException: java.lang.NullPointerException
                at org.geoserver.kml.KMLEncoder.encode(KMLEncoder.java:51)
                at 
org.geoserver.kml.KMLMapResponse.write(KMLMapResponse.java:61)
                at org.geoserver.ows.Dispatcher.response(Dispatcher.java:1032)
                at 
org.geoserver.ows.Dispatcher.handleRequestInternal(Dispatcher.java:268)
                at 
org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:174)
                at 
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:50)
                at 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:967)
                at 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:901)
                at 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
                at 
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
                at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
                at 
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
                at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
                at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
                at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
                at 
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
                at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
                at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
                at 
org.geoserver.filters.ThreadLocalsCleanupFilter.doFilter(ThreadLocalsCleanupFilter.java:26)
                at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
                at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
                at 
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:69)
                at 
org.geoserver.wms.animate.AnimatorFilter.doFilter(AnimatorFilter.java:73)
                at 
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:66)
                at 
org.geoserver.monitor.MonitorFilter.doFilter(MonitorFilter.java:141)
                at 
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:66)
                at 
org.geoserver.flow.controller.IpBlacklistFilter.doFilter(IpBlacklistFilter.java:89)
                at 
org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(SpringDelegatingFilter.java:66)
                at 
org.geoserver.filters.SpringDelegatingFilter.doFilter(SpringDelegatingFilter.java:41)
                at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
                at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
                at 
org.geoserver.platform.AdvancedDispatchFilter.doFilter(AdvancedDispatchFilter.java:37)
                at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
                at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
                at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:317)
                at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
                at 
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127)
                at 
org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91)
                at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
                at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
                at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
                at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
                at 
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:114)
                at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
                at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
                at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
                at 
org.geoserver.security.filter.GeoServerAnonymousAuthenticationFilter.doFilter(GeoServerAnonymousAuthenticationFilter.java:51)
                at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
                at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
                at 
org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilterInternal(BasicAuthenticationFilter.java:158)
                at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
                at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
                at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
                at 
org.geoserver.security.filter.GeoServerBasicAuthenticationFilter.doFilter(GeoServerBasicAuthenticationFilter.java:81)
                at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
                at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
                at 
org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
                at 
org.geoserver.security.filter.GeoServerSecurityContextPersistenceFilter$1.doFilter(GeoServerSecurityContextPersistenceFilter.java:52)
                at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
                at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
                at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331)
                at 
org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214)
                at 
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177)
                at 
org.geoserver.security.GeoServerSecurityFilterChainProxy.doFilter(GeoServerSecurityFilterChainProxy.java:141)
                at 
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:347)
                at 
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:263)
                at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
                at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
                at 
org.geoserver.filters.LoggingFilter.doFilter(LoggingFilter.java:90)
                at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
                at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
                at 
org.geoserver.filters.XFrameOptionsFilter.doFilter(XFrameOptionsFilter.java:79)
                at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
                at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
                at org.geoserver.filters.GZIPFilter.doFilter(GZIPFilter.java:48)
                at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
                at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
                at 
org.geoserver.filters.SessionDebugFilter.doFilter(SessionDebugFilter.java:46)
                at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
                at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
                at 
org.geoserver.filters.FlushSafeFilter.doFilter(FlushSafeFilter.java:42)
                at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
                at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
                at 
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
                at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
                at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
                at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
                at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198)
                at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
                at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478)
                at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140)
                at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:80)
                at 
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:624)
                at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87)
                at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342)
                at 
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799)
                at 
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
                at 
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:861)
                at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1455)
                at 
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
                at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown 
Source)
                at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown 
Source)
                at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
                at java.lang.Thread.run(Unknown Source)
Caused by: javax.xml.transform.TransformerException: 
javax.xml.transform.TransformerException: java.lang.NullPointerException
                at 
com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(Unknown 
Source)
                at 
com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(Unknown 
Source)
                at org.geoserver.kml.KMLEncoder.encode(KMLEncoder.java:48)
                ... 103 more
Caused by: javax.xml.transform.TransformerException: 
java.lang.NullPointerException
                at 
com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.getDOM(Unknown 
Source)
                ... 106 more
Caused by: java.lang.NullPointerException

</ServiceException></ServiceExceptionReport>

From: Andrea Aime <andrea.a...@geo-solutions.it>
Sent: Saturday, December 1, 2018 2:09 AM
To: Douville, Michelle R CITZ:EX <michelle.douvi...@gov.bc.ca>
Cc: GeoServer Mailing List List <geoserver-users@lists.sourceforge.net>
Subject: Re: [Geoserver-users] KMCENTROID_CLIP:true parameter not working at 
2.14

On Fri, Nov 30, 2018 at 11:27 PM Douville, Michelle R CITZ:EX 
<michelle.douvi...@gov.bc.ca<mailto:michelle.douvi...@gov.bc.ca>> wrote:
There error is this –
<ServiceException>
      javax.xml.transform.TransformerException: 
javax.xml.transform.TransformerException: java.lang.NullPointerException
javax.xml.transform.TransformerException: java.lang.NullPointerException
java.lang.NullPointerException
Details:
org.geoserver.platform.ServiceException: 
javax.xml.transform.TransformerException: 
javax.xml.transform.TransformerException: java.lang.NullPointerException
                at org.geoserver.kml.KMLEncoder.encode(KMLEncoder.java:51)
                at 
org.geoserver.kml.KMLMapResponse.write(KMLMapResponse.java:61)
                at org.geoserver.ows.Dispatcher.response(Dispatcher.java:1032)
                at 
org.geoserver.ows.Dispatcher.handleRequestInternal(Dispatcher.java:268)

Please share the entire stack trace, the interesting bits are normally found at 
the beginning and at the end of it (so we need it all).

 I believe this was added to the master in 2.12. (we sponsored this work, and 
we probably have a custom jar for 2.10.1 to support it).

So you never tested it on an official version of GeoServer before? For all we 
know, it might as well never worked.

Cheers
Andrea

==

GeoServer Professional Services from the experts! Visit http://goo.gl/it488V 
for more information. == Ing. Andrea Aime @geowolf Technical Lead GeoSolutions 
S.A.S. Via di Montramito 3/A 55054 Massarosa (LU) phone: +39 0584 962313 fax: 
+39 0584 1660272 mob: +39 339 8844549 http://www.geo-solutions.it 
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