debian/changelog

+tomcat9 (9.0.16-4) unstable; urgency=medium
+
+  * Team upload.
+  * Permit read and write access to /var/lib/solr and create /var/lib/solr in
+    case it does not exist. (Closes: #919638)
+
+ -- Markus Koschany <apo@debian.org>  Fri, 01 Mar 2019 13:28:25 +0100
+
 tomcat9 (9.0.16-3) unstable; urgency=medium
 
   * Removed read/write access to /var/lib/solr (Closes: #923299)

debian/tomcat9.dirs

@@ -4,3 +4,4 @@ var/lib/tomcat9/webapps
 var/log/tomcat9/
 etc/tomcat9/Catalina
 etc/logrotate.d
+var/lib/solr

debian/tomcat9.service

@@ -39,6 +39,7 @@ CacheDirectoryMode=750
 ProtectSystem=strict
 ReadWritePaths=/etc/tomcat9/Catalina/
 ReadWritePaths=/var/lib/tomcat9/webapps/
+ReadWritePaths=/var/lib/solr/
 
 [Install]
 WantedBy=multi-user.target