Hi list,
I am trying to set up a layergroup consisting of layergroups that I created
before and I run into the same error all the time. Is it because of the
empty style elements? But how do I address a style for a layergroup?

This is what I tried:

curl -v -u %login% -POST -H "Content-type: text/xml" -d
"<layerGroup><name>test</name><layers><layer>collins:
Collins_Midscale_Stadt</layer><layer>collins:Collins_World_
Hintergrund</layer></layers><styles><style></style><style></style></styles></layerGroup>"
%url%/workspaces/collins/layergroups
*   Trying ::1...
* TCP_NODELAY set
* Connected to localhost (::1) port 8080 (#0)
* Server auth using Basic with user 'admin'
> POST /geoserver/rest/workspaces/collins/layergroups HTTP/1.1
> Host: localhost:8080
> Authorization: Basic YWRtaW46Z2Vvc2VydmVy
> User-Agent: curl/7.61.0
> Accept: */*
> Content-type: text/xml
> Content-Length: 199
>
* upload completely sent off: 199 out of 199 bytes
< HTTP/1.1 500
< X-Frame-Options: SAMEORIGIN
< Transfer-Encoding: chunked
< Date: Mon, 27 Aug 2018 07:32:24 GMT
< Connection: close
<
Layer group must not be empty* Closing connection 0

This is what I find in the log:

2018-08-27 09:32:24,217 ERROR [geoserver.rest] - Layer group must not be
empty
java.lang.IllegalArgumentException: Layer group must not be empty
    at org.geoserver.catalog.impl.CatalogImpl.validate(CatalogImpl.java:867)
    at org.geoserver.security.SecureCatalogImpl.validate(
SecureCatalogImpl.java:1162)
    at org.geoserver.catalog.impl.AbstractFilteredCatalog.validate(
AbstractFilteredCatalog.java:546)
    at org.geoserver.catalog.impl.AbstractCatalogDecorator.validate(
AbstractCatalogDecorator.java:451)
    at org.geoserver.catalog.impl.LocalWorkspaceCatalog.validate(
LocalWorkspaceCatalog.java:245)
    at org.geoserver.rest.catalog.LayerGroupController.layerGroupPost(
LayerGroupController.java:140)
    at sun.reflect.GeneratedMethodAccessor790.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.springframework.web.method.support.InvocableHandlerMethod.
doInvoke(InvocableHandlerMethod.java:205)
    at org.springframework.web.method.support.InvocableHandlerMethod.
invokeForRequest(InvocableHandlerMethod.java:133)
    at org.springframework.web.servlet.mvc.method.annotation.
ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.
java:116)
    at org.springframework.web.servlet.mvc.method.annotation.
RequestMappingHandlerAdapter.invokeHandlerMethod(
RequestMappingHandlerAdapter.java:827)
    at org.springframework.web.servlet.mvc.method.annotation.
RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.
java:738)
    at org.springframework.web.servlet.mvc.method.
AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
    at org.springframework.web.servlet.DispatcherServlet.
doDispatch(DispatcherServlet.java:963)
    at org.springframework.web.servlet.DispatcherServlet.
doService(DispatcherServlet.java:897)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(
FrameworkServlet.java:970)
    at org.springframework.web.servlet.FrameworkServlet.
doPost(FrameworkServlet.java:872)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)
    at org.springframework.web.servlet.FrameworkServlet.
service(FrameworkServlet.java:846)
    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:28)
    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$Chain.doFilter(
SpringDelegatingFilter.java:75)
    at org.geoserver.wms.animate.AnimatorFilter.doFilter(
AnimatorFilter.java:71)
    at org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(
SpringDelegatingFilter.java:71)
    at org.geoserver.flow.controller.IpBlacklistFilter.doFilter(
IpBlacklistFilter.java:94)
    at org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(
SpringDelegatingFilter.java:71)
    at org.geoserver.flow.ControlFlowCallback.doFilter(
ControlFlowCallback.java:248)
    at org.geoserver.filters.SpringDelegatingFilter$Chain.doFilter(
SpringDelegatingFilter.java:71)
    at org.geoserver.filters.SpringDelegatingFilter.doFilter(
SpringDelegatingFilter.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.platform.AdvancedDispatchFilter.doFilter(
AdvancedDispatchFilter.java:50)
    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:316)
    at org.geoserver.security.filter.GeoServerCompositeFilter$
NestedFilterChain.doFilter(GeoServerCompositeFilter.java:69)
    at org.springframework.security.web.access.intercept.
FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126)
    at org.springframework.security.web.access.intercept.
FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90)
    at org.geoserver.security.filter.GeoServerCompositeFilter$
NestedFilterChain.doFilter(GeoServerCompositeFilter.java:73)
    at org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(
GeoServerCompositeFilter.java:92)
    at org.springframework.security.web.FilterChainProxy$
VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    at org.geoserver.security.filter.GeoServerCompositeFilter$
NestedFilterChain.doFilter(GeoServerCompositeFilter.java:69)
    at org.springframework.security.web.access.ExceptionTranslationFilter.
doFilter(ExceptionTranslationFilter.java:114)
    at org.geoserver.security.filter.GeoServerCompositeFilter$
NestedFilterChain.doFilter(GeoServerCompositeFilter.java:73)
    at org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(
GeoServerCompositeFilter.java:92)
    at org.springframework.security.web.FilterChainProxy$
VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    at org.geoserver.security.filter.GeoServerAnonymousAuthenticati
onFilter.doFilter(GeoServerAnonymousAuthenticationFilter.java:54)
    at org.springframework.security.web.FilterChainProxy$
VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    at org.geoserver.security.filter.GeoServerCompositeFilter$
NestedFilterChain.doFilter(GeoServerCompositeFilter.java:69)
    at org.springframework.security.web.authentication.www.
BasicAuthenticationFilter.doFilterInternal(BasicAuthenticationFilter.
java:213)
    at org.springframework.web.filter.OncePerRequestFilter.
doFilter(OncePerRequestFilter.java:107)
    at org.geoserver.security.filter.GeoServerCompositeFilter$
NestedFilterChain.doFilter(GeoServerCompositeFilter.java:73)
    at org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(
GeoServerCompositeFilter.java:92)
    at org.geoserver.security.filter.GeoServerBasicAuthenticationFi
lter.doFilter(GeoServerBasicAuthenticationFilter.java:84)
    at org.springframework.security.web.FilterChainProxy$
VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    at org.geoserver.security.filter.GeoServerCompositeFilter$
NestedFilterChain.doFilter(GeoServerCompositeFilter.java:69)
    at org.springframework.security.web.context.
SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilt
er.java:91)
    at org.geoserver.security.filter.GeoServerSecurityContextPersis
tenceFilter$1.doFilter(GeoServerSecurityContextPersistenceFilter.java:53)
    at org.geoserver.security.filter.GeoServerCompositeFilter$
NestedFilterChain.doFilter(GeoServerCompositeFilter.java:73)
    at org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(
GeoServerCompositeFilter.java:92)
    at org.springframework.security.web.FilterChainProxy$
VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(
FilterChainProxy.java:213)
    at org.springframework.security.web.FilterChainProxy.doFilter(
FilterChainProxy.java:176)
    at org.geoserver.security.GeoServerSecurityFilterChainProxy.doFilter(
GeoServerSecurityFilterChainProxy.java:152)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(
DelegatingFilterProxy.java:346)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(
DelegatingFilterProxy.java:262)
    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:88)
    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:89)
    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: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.FlushSafeFilter.doFilter(
FlushSafeFilter.java:44)
    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:199)
    at org.apache.catalina.core.StandardContextValve.invoke(
StandardContextValve.java:96)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(
AuthenticatorBase.java:494)
    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:651)
    at org.apache.catalina.core.StandardEngineValve.invoke(
StandardEngineValve.java:87)
    at org.apache.catalina.connector.CoyoteAdapter.service(
CoyoteAdapter.java:343)
    at org.apache.coyote.http11.Http11Processor.service(
Http11Processor.java:412)
    at org.apache.coyote.AbstractProcessorLight.process(
AbstractProcessorLight.java:66)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(
AbstractProtocol.java:754)
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.
doRun(NioEndpoint.java:1385)
    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)

Cheers, Niko
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