Getting this from daiwa.xwiki.com:

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Error number 3201 in 3: Exception while saving document XWiki.XWikiPreferences
Wrapped Exception: Error number 3212 in 3: Exception while loading archive XWiki.XWikiPreferences
Wrapped Exception: Error number 3212 in 3: Exception while loading archive 104,408,758
Wrapped Exception: exception setting property value with CGLIB (set hibernate.cglib.use_reflection_optimizer=false for more info) setter of com.xpn.xwiki.doc.XWikiDocumentArchive.setArchive
        org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:535)
        org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:433)
        org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
        org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
        org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:121)

root cause

com.xpn.xwiki.XWikiException: Error number 3201 in 3: Exception while saving document XWiki.XWikiPreferences
Wrapped Exception: Error number 3212 in 3: Exception while loading archive XWiki.XWikiPreferences
Wrapped Exception: Error number 3212 in 3: Exception while loading archive 104,408,758
Wrapped Exception: exception setting property value with CGLIB (set hibernate.cglib.use_reflection_optimizer=false for more info) setter of com.xpn.xwiki.doc.XWikiDocumentArchive.setArchive
        com.xpn.xwiki.store.XWikiHibernateStore.saveXWikiDoc(XWikiHibernateStore.java:314)
        com.xpn.xwiki.store.XWikiCacheStore.saveXWikiDoc(XWikiCacheStore.java:100)
        com.xpn.xwiki.store.XWikiCacheStore.saveXWikiDoc(XWikiCacheStore.java:94)
        com.xpn.xwiki.XWiki.saveDocument(XWiki.java:890)
        com.xpn.xwiki.XWiki.getPrefsClass(XWiki.java:2286)
        com.xpn.xwiki.XWiki.updateDatabase(XWiki.java:349)
        com.xpn.xwiki.XWiki.updateDatabase(XWiki.java:328)
        com.xpn.xwiki.XWiki.getXWiki(XWiki.java:444)
        com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:96)
        org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
        org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
        org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
        org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
        javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:121)

note The full stack trace of the root cause is available in the Apache Tomcat/5.5.17 logs.