Hi,

I tried your call on a Geoserver version 2.15.2 and can confirm there is a bug 
in that version. Which version are you running?
You should consider to open an issue, to have someone look further into the 
case.

I've got the trace log from the log-files as well. That could be useful when 
opening an issue.

Best regards,
Roar Brænden

2021-08-27 06:08:10,705 ERROR [geoserver.rest] - Error writing style
org.geoserver.rest.RestException 500 INTERNAL_SERVER_ERROR: Error writing style
        at 
org.geoserver.rest.catalog.StyleController.styleSLDPost(StyleController.java:242)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at 
org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:207)
        at 
org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
        at 
org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)
        at 
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895)
        at 
org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:800)
        at 
org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
        at 
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1038)
        at 
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:942)
        at 
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:998)
        at 
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:901)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
        at 
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:875)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
        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:53)
        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.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$VirtualFilterChain.doFilter(FilterChainProxy.java:320)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$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:334)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
        at 
org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:74)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:91)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
        at 
org.geoserver.security.filter.GeoServerAnonymousAuthenticationFilter.doFilter(GeoServerAnonymousAuthenticationFilter.java:51)
        at 
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:70)
        at 
org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilterInternal(BasicAuthenticationFilter.java:215)
        at 
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$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$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
        at 
org.geoserver.security.filter.GeoServerCompositeFilter$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:334)
        at 
org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215)
        at 
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178)
        at 
org.geoserver.security.GeoServerSecurityFilterChainProxy.doFilter(GeoServerSecurityFilterChainProxy.java:142)
        at 
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:357)
        at 
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:270)
        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:200)
        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:200)
        at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
        at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
        at 
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:678)
        at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
        at 
org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:408)
        at 
org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
        at 
org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:836)
        at 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1839)
        at 
org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:748)
Caused by: java.io.IOException: Error writing style
        at org.geoserver.catalog.SLDHandler.encode10(SLDHandler.java:263)
        at org.geoserver.catalog.SLDHandler.encode(SLDHandler.java:250)
        at org.geoserver.catalog.ResourcePool.writeStyle(ResourcePool.java:2069)
        at 
org.geoserver.rest.catalog.StyleController.writeStyle(StyleController.java:531)
        at 
org.geoserver.rest.catalog.StyleController.styleSLDPost(StyleController.java:240)
        ... 104 more
Caused by: javax.xml.transform.TransformerException: Translator error
        at 
org.geotools.xml.transform.TransformerBase.transform(TransformerBase.java:122)
        at 
org.geotools.xml.transform.TransformerBase.transform(TransformerBase.java:100)
        at org.geoserver.catalog.SLDHandler.encode10(SLDHandler.java:261)
        ... 108 more
Caused by: java.lang.NullPointerException
        at 
org.apache.xml.serializer.ToStream.writeAttrString(ToStream.java:2098)
        at 
org.apache.xml.serializer.ToStream.processAttributes(ToStream.java:2078)
        at org.apache.xml.serializer.ToStream.endElement(ToStream.java:2223)
        at 
org.apache.xalan.transformer.TransformerIdentityImpl.endElement(TransformerIdentityImpl.java:1102)
        at 
org.geotools.xml.transform.TransformerBase$ContentHandlerFilter.endElement(TransformerBase.java:312)
        at 
org.geotools.xml.transform.TransformerBase$TranslatorSupport._end(TransformerBase.java:802)
        at 
org.geotools.xml.transform.TransformerBase$TranslatorSupport.access$400(TransformerBase.java:404)
        at 
org.geotools.xml.transform.TransformerBase$TranslatorSupport$DirectBackend.end(TransformerBase.java:594)
        at 
org.geotools.xml.transform.TransformerBase$TranslatorSupport.end(TransformerBase.java:796)
        at 
org.geotools.xml.transform.TransformerBase$TranslatorSupport.element(TransformerBase.java:762)
        at 
org.geotools.xml.styling.SLDTransformer$SLDTranslator.visit(SLDTransformer.java:809)
        at 
org.geotools.styling.ExternalGraphicImpl.accept(ExternalGraphicImpl.java:135)
        at 
org.geotools.xml.styling.SLDTransformer$SLDTranslator.visit(SLDTransformer.java:952)
        at org.geotools.styling.GraphicImpl.accept(GraphicImpl.java:333)
        at 
org.geotools.xml.styling.SLDTransformer$SLDTranslator.visit(SLDTransformer.java:925)
        at 
org.geotools.styling.PointSymbolizerImpl.accept(PointSymbolizerImpl.java:86)
        at 
org.geotools.xml.styling.SLDTransformer$SLDTranslator.visit(SLDTransformer.java:888)
        at org.geotools.styling.RuleImpl.accept(RuleImpl.java:303)
        at 
org.geotools.xml.styling.SLDTransformer$SLDTranslator.visit(SLDTransformer.java:1232)
        at 
org.geotools.xml.styling.SLDTransformer$SLDTranslator.visit(SLDTransformer.java:1195)
        at 
org.geotools.xml.styling.SLDTransformer$SLDTranslator.visit(SLDTransformer.java:1015)
        at 
org.geotools.xml.styling.SLDTransformer$SLDTranslator.visit(SLDTransformer.java:987)
        at 
org.geotools.styling.StyledLayerDescriptorImpl.accept(StyledLayerDescriptorImpl.java:171)
        at 
org.geotools.xml.styling.SLDTransformer$SLDTranslator.encode(SLDTransformer.java:1369)
        at 
org.geotools.xml.styling.SLDTransformer$SLDTranslator.encode(SLDTransformer.java:1378)
        at 
org.geotools.xml.transform.TransformerBase$XMLReaderSupport.parse(TransformerBase.java:995)
        at 
org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:485)
        at 
org.geotools.xml.transform.TransformerBase$Task.run(TransformerBase.java:283)
        at 
org.geotools.xml.transform.TransformerBase.transform(TransformerBase.java:118)
        ... 110 more


> 26. aug. 2021 kl. 15:43 skrev Christian Mayer <ml...@meggsimum.de>:
> 
> curl -X POST \
>  
> 'http://localhost:8080/geoserver/rest/workspaces/test-cm/styles?name=foo 
> <http://localhost:8080/geoserver/rest/workspaces/test-cm/styles?name=foo>' \
>   -H 'Authorization: Basic YWRtaW46Z2Vvc2VydmVy' \
>   -H 'Content-Type: application/vnd.ogc.sld+xml' \
>   -H 'cache-control: no-cache' \
>   -d '<?xml version="1.0" encoding="UTF-8"?>
> <StyledLayerDescriptor
> xmlns:xsi='\''http://www.w3.org/2001/XMLSchema-instance'\' 
> <http://www.w3.org/2001/XMLSchema-instance'/'>'
>     xmlns="http://www.opengis.net/sld <http://www.opengis.net/sld>"
>     xmlns:sld="http://www.opengis.net/sld <http://www.opengis.net/sld>"
>     xmlns:se="http://www.opengis.net/se <http://www.opengis.net/se>"
>     xsi:schemaLocation="http://www.opengis.net/sld 
> <http://www.opengis.net/sld>
> http://schemas.opengis.net/sld/1.1.0/StyledLayerDescriptor.xsd 
> <http://schemas.opengis.net/sld/1.1.0/StyledLayerDescriptor.xsd>
>                         http://www.opengis.net/se <http://www.opengis.net/se>
> http://schemas.opengis.net/se/1.1.0/FeatureStyle.xsd 
> <http://schemas.opengis.net/se/1.1.0/FeatureStyle.xsd>"
>     version="1.1.0"
>     >
>     <UserLayer>
>       <se:Name>sauber_stations</se:Name>
>         <UserStyle>
>             <se:FeatureTypeStyle>
>                 <se:Rule>
>                   <se:Name>sauber_stations_rule_1</se:Name>
>                     <se:PointSymbolizer>
>                       <se:Graphic>
>                           <se:ExternalGraphic>
>                               <se:InlineContent
> encoding="base64">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</se:InlineContent>
>                               <se:Format>image/png</se:Format>
>                           </se:ExternalGraphic>
>                       </se:Graphic>
>                     </se:PointSymbolizer>
>                 </se:Rule>
>             </se:FeatureTypeStyle>
>         </UserStyle>
>     </UserLayer>
> </StyledLayerDescriptor>'

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