Hi all,

I would migrate geoserver from 2.7.x to 2.9.x, but I would maintain the data 
[ubuntu server 16.04, tomcat7].

I sobstitute the geoserver .war in the tomcat7 container, and on tomcat start 
geoserver is running.

Then I move the data dir away and I sobstituite it with the old data dir (I 
made a backup before).

I started again tomcat but I had:


java.lang.IllegalArgumentException: host parameter is null
        
org.apache.commons.httpclient.HttpConnection.<init>(HttpConnection.java:206)
        
org.apache.commons.httpclient.HttpConnection.<init>(HttpConnection.java:155)
        
org.apache.commons.httpclient.SimpleHttpConnectionManager.getConnectionWithTimeout(SimpleHttpConnectionManager.java:175)
        
org.apache.commons.httpclient.HttpMethodDirector.executeMethod(HttpMethodDirector.java:153)
        
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:397)
        
org.apache.commons.httpclient.HttpClient.executeMethod(HttpClient.java:323)
        org.geonode.security.HTTPClient.sendGET(HTTPClient.java:89)
        
org.geonode.security.DefaultSecurityClient.authenticate(DefaultSecurityClient.java:185)
        
org.geonode.security.DefaultSecurityClient.authenticateCookie(DefaultSecurityClient.java:116)
        
org.geonode.security.GeoNodeAuthenticationProvider.authenticate(GeoNodeAuthenticationProvider.java:66)
        
org.geoserver.security.GeoServerAuthenticationProvider.authenticate(GeoServerAuthenticationProvider.java:58)
        
org.springframework.security.authentication.ProviderManager.authenticate(ProviderManager.java:167)
        
org.geoserver.security.GeoServerSecurityManager$1.authenticate(GeoServerSecurityManager.java:323)
        
org.geonode.security.GeoNodeCookieProcessingFilter.doFilter(GeoNodeCookieProcessingFilter.java:94)
        
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
        
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:69)
        
org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:91)
        
org.geoserver.security.filter.GeoServerSecurityContextPersistenceFilter$1.doFilter(GeoServerSecurityContextPersistenceFilter.java:53)
        
org.geoserver.security.filter.GeoServerCompositeFilter$NestedFilterChain.doFilter(GeoServerCompositeFilter.java:73)
        
org.geoserver.security.filter.GeoServerCompositeFilter.doFilter(GeoServerCompositeFilter.java:92)
        
org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
        
org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:213)
        
org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:176)
        
org.geoserver.security.GeoServerSecurityFilterChainProxy.doFilter(GeoServerSecurityFilterChainProxy.java:152)
        
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
        
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
        org.geoserver.filters.LoggingFilter.doFilter(LoggingFilter.java:87)
        org.geoserver.filters.GZIPFilter.doFilter(GZIPFilter.java:42)
        
org.geoserver.filters.SessionDebugFilter.doFilter(SessionDebugFilter.java:48)
        org.geoserver.filters.FlushSafeFilter.doFilter(FlushSafeFilter.java:44)
        
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121)
        
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)

I read the documentation but no tips were mentioned on data dir migration, less 
then this note:

Note



Some minor version migrations may not be reversible, since newer versions of 
GeoServer may make backwards-incompatible changes to the data directory.



Could be the case from 2.7 to 2.9?


Hints on that?


E.


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