upgrade xwiki to 1.0b2 encounter "Could not initialize main XWiki context"

[xwiki xwiki]

Hi,

we were using xwiki 0.9.840, and recently I test to update with 1.0b2
with old database.

as we are using postgresql as our db backend, I need to update xwiki
with database migration (which I have seen 1.0b2 supports migration), I
have modified the hibernate.cfg.xml to postgresql configuration.

our system is:

    * gentoo 2006.1
    * tomcat: 5.0.27-r6
    * postgresql: postgresql-8.0.8
    * jdbc: postgresql-8.0-315.jdbc3.jar 

after start tomcat, I connect to xwiki page and get following exception:

exception

javax.servlet.ServletException: Error number 3 in 0: Could not
initialize main XWiki context
Wrapped Exception: Error number 3201 in 3: Exception while saving
document XWiki.TagClass
Wrapped Exception: Could not execute JDBC batch update

	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 3 in 0: Could not initialize
main XWiki context
Wrapped Exception: Error number 3201 in 3: Exception while saving
document XWiki.TagClass
Wrapped Exception: Could not execute JDBC batch update
	com.xpn.xwiki.XWiki.getMainXWiki(XWiki.java:223)
	com.xpn.xwiki.XWiki.getXWiki(XWiki.java:303)
	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)

i believe that there are people using postgresql, is that you have
experienced same error? or it's not the problem with postgresql?

any help to solve this problem?

best regards,

muzi