logging & caching problem

hello all, besides: i did a sort of remote control for group and user management using a rest approach: far from perfect, but working stable. why? you can syncronize the xwiki users and groups if you integrate xwiki with another app. haven't had the time yet to add it to the source, but as it is actually something that is not situated inside the xwiki at runtime but the other app, i cannot figure out where to put it. the issues i try to deploy xwiki on a debian 3.1 web server. it works almost fine, except two exceptions that keep me worrying: first, the logger cannot start its work, the xwiki.log is in the xwiki directory under webapps. second, the cache can not be configured, even though there *is* a directory under xwiki temnp/imageCache, that is writeable for tomcat5:nogroup. stack trace below. ERROR 22:42:01,888 com.opensymphony.oscache.base.AbstractCacheAdministrator.(AbstractCacheAdministrator.java:301) - Error instantiating class 'com.opensymphony.oscache.plugins.diskpersistence.DiskPersistenceListener' java.lang.NullPointerException at com.opensymphony.oscache.plugins.diskpersistence.AbstractDiskPersistenceListener.configure(AbstractDiskPersistenceListener.java:162) . . . ERROR 22:42:01,891 com.opensymphony.oscache.plugins.diskpersistence.AbstractDiskPersistenceListener.(AbstractDiskPersistenceListener.java:284) - cache.path 'temp/imageCache' is not a directory ERROR 22:42:01,892 com.opensymphony.oscache.base.AbstractCacheAdministrator.(AbstractCacheAdministrator.java:301) - Error instantiating class 'com.opensymphony.oscache.plugins.diskpersistence.DiskPersistenceListener' java.lang.NullPointerException at -- ontopica Thomas Krämer Krämer&Okpue GbR Kurfürstenstr. 66 53115 Bonn Fon +49 228 - 180 99 737 Fax +49 228 - 242 78 60 Email tk(a)ontopica.de