ClassCastException with  Derby db on geronimo server
----------------------------------------------------

                 Key: XE-152
                 URL: http://jira.xwiki.org/jira/browse/XE-152
             Project: XWiki Enterprise
          Issue Type: Bug
    Affects Versions: 1.1.2
         Environment: on  a geronimo server with java 6 and derby configured as 
DB, ubuntu 7.10
            Reporter: Haiko van der Schaaf


When deploying xwiki-standard.war  a ClassCastException follows.Hibernate 
cannot resolve a placeholder. 

part of logfile:
007-11-26 22:09:52,752 [DEBUG] (GeronimoLog.java:66)     - resolving reference 
to class: com.xpn.xwiki.objects.BaseProperty
2007-11-26 22:09:52,758 [DEBUG] (GeronimoLog.java:66)     - Cache: exception 
while getting doc xwiki:XWiki.XWikiPreferences for real
com.xpn.xwiki.XWikiException: Error number 3202 in 3: Exception while reading 
document XWiki.XWikiPreferences
Wrapped Exception: java.util.HashSet cannot be cast to java.lang.String
        at 
com.xpn.xwiki.store.XWikiHibernateStore.loadXWikiDoc(XWikiHibernateStore.java:459)
        at 
com.xpn.xwiki.store.XWikiCacheStore.loadXWikiDoc(XWikiCacheStore.java:158)
        at com.xpn.xwiki.XWiki.getDocument(XWiki.java:981)
        at com.xpn.xwiki.XWiki.getDocument(XWiki.java:1015)
        at com.xpn.xwiki.XWiki.getPrefsClass(XWiki.java:2266)
        at com.xpn.xwiki.XWiki.initXWiki(XWiki.java:719)
        at com.xpn.xwiki.XWiki.<init>(XWiki.java:611)
        at com.xpn.xwiki.XWiki.getMainXWiki(XWiki.java:238)
        at com.xpn.xwiki.XWiki.getXWiki(XWiki.java:397)
        at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:94)
......

Wrapped Exception:

java.lang.ClassCastException: java.util.HashSet cannot be cast to 
java.lang.String
        at 
org.hibernate.util.PropertiesHelper.resolvePlaceHolders(PropertiesHelper.java:88)
        at 
org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1173)
        at 
com.xpn.xwiki.store.XWikiHibernateBaseStore.initHibernate(XWikiHibernateBaseStore.java:142)
        at 
com.xpn.xwiki.store.XWikiHibernateBaseStore.checkHibernate(XWikiHibernateBaseStore.java:464)
        at 
com.xpn.xwiki.store.XWikiHibernateStore.loadXWikiDoc(XWikiHibernateStore.java:352)
        at 
com.xpn.xwiki.store.XWikiCacheStore.loadXWikiDoc(XWikiCacheStore.java:158)
        at com.xpn.xwiki.XWiki.getDocument(XWiki.java:981)
        at com.xpn.xwiki.XWiki.getDocument(XWiki.java:1015)
        at com.xpn.xwiki.XWiki.getPrefsClass(XWiki.java:2266)
        at com.xpn.xwiki.XWiki.initXWiki(XWiki.java:719)
        at com.xpn.xwiki.XWiki.<init>(XWiki.java:611)
        at com.xpn.xwiki.XWiki.getMainXWiki(XWiki.java:238)
        at com.xpn.xwiki.XWiki.getXWiki(XWiki.java:397)
        at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:94)
        at 
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
        at 
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
        at 
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
        at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)



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