Problems with Permissions in XWiki Cache

Hi! We have a (maybe very small) problem that keeps us busy for weeks now, and we do not find the solution. We want to create XWiki-documents from another web-application and set also the document-rights depending on the rights the user has in that other web-application. Creating the document works very fine and also the document-rights are set correctly in the database. But with the document-rights we unfortunately have (presumably) problems with the cache. When a user opens the link to a XWiki-document, the document-rights of that document are newly set before the document is openend. So when user "1" opens a new XWiki-document, the user "XWiki.1" (xws_value) is entered in the db-table "xwikistrings" along with the value "users" in the "xws_name"-column (xws_id of the document). And that user can then correctly see the XWiki-document. But when a second user "2" wants to open that same document, he only gets the message "You are not allowed to view this document or perform this action" although he is correctly entered in the "xwikistrings"-table: xws_id = id of document; xws_name = users; xws_value = "XWiki.1,XWiki.2". That second user can see the document not until a $xwiki.flushcache() is performed (which is not easy to automatically realize in that process) or the tomcat is restartet. A com.xpn.xwiki.XWiki.flushCache() in our Java-Code - which would serve us best - does somehow not have the desired effect. If we run XWiki without Cache (xwiki.store.cache) our procedure works also correctly. Hence, it seems like flushing the cache from our java-code does not work for any reason. Here is our code for setting the document-rights: private boolean doUpdateRight(String fullname, String user, String group, String level, boolean allow, boolean global) throws XWikiException { this.xdoc = xwiki.getDocument(fullname, context); this.bobj = new BaseObject(); this.bobj.setName(fullname); if (global) this.bclass = xwiki.getGlobalRightsClass(context); else this.bclass = xwiki.getRightsClass(context); this.bobj = (BaseObject) xdoc.getObject(bclass.getName()); String oldusers = bobj.getStringValue("users"); if(!(oldusers.contains(user))) { bobj.setStringValue("users", oldusers+","+user); XWikiDocument tdoc; tdoc = xdoc; XWikiDocument olddoc = (XWikiDocument) tdoc.clone(); tdoc.setObject(bclass.getClassName(), 0, bobj); xwiki.saveDocument(tdoc, olddoc, context); xwiki.flushCache(); } return true; } When starting Xwiki we get the warning, that oscache.properties and oscache-local.properties are not loade although they are existing in the WEB-INF folder ([http-8080-Processor24] WARN com.xpn.xwiki.cache.impl.OSCacheService - Could not load cache properties oscache.properties: null [http-8080-Processor24] WARN com.xpn.xwiki.cache.impl.OSCacheService - Could not load cache properties oscache-local.properties: null). Could that have an influence on the XWiki-cache problem mentioned above? We are working with XWiki 1.0 We would be very pleased if anybody could help us out. We do have no further ideas what else to try :-( Thanks in advance! Georg