Re: [xwiki-devs] Problems creating a query using the QueryManager

28 Jul 2008


      Hi Markus,

On Mon, Jul 28, 2008 at 11:23 AM, Markus Lanthaler
<[email protected]> wrote:
...
Hi,
I'm currently implementing the last things to finish OpenID authentication
support but I have some problems with the query manager. I'm trying to get
the document (should be only one) which an attached OpenIdIdentifier object
whose "identifier" string property's value has some specific value. I didn't
found any documentation apart http://markmail.org/message/jt6m2huqr4r6hvk6
and
http://dev.xwiki.org/xwiki/bin/view/Design/XWiki+Query+Language+Specificatio....
I tried to achieve this by the following code:
public static String findOpenIDUser(String openid_identifier,
XWikiContext context) throws XWikiException
   {
       XWiki xwiki = context.getWiki();
QueryManager qm = xwiki.getStore().getQueryManager();
       Query search_user;
if (qm.hasLanguage(Query.HQL)) {
           search_user =
               qm.createQuery(", BaseObject as obj, StringProperty as prop
where doc.fullName = obj.name and obj.className = 'XWiki.OpenIdIdentifier'
and obj.id=prop.id.id and prop.id.name='identifier' and prop.value =
':identifier'", Query.HQL);
I think it's "prop.value =:identifier" (not ':identifier') otherwise
hibernate will consider you use the value ":identifier" and will not
replace it.
...
} else if (qm.hasLanguage(Query.XPATH)) {
           search_user =
qm.createQuery("/*/*[obj/XWiki/OpenIdIdentifier/@xp:identifier =
':identifier'] ", Query.XPATH);
       } else
           throw new RuntimeException();
search_user.bindValue("identifier", openid_identifier);
List<XWikiDocument> found_users = search_user.setLimit(1).execute();
       if (found_users.size() > 0) {
           if (log.isDebugEnabled()) {
               log.debug("OpenID " + openid_identifier + " already
registered.");
           }
           return found_users.get(0).getFullName();
       }
return null;
   }
but all I get is a NullPointerException when qm.createQuery(..., Query.HQL)
is called. What's wrong with my code?
java.lang.NullPointerException
 at
com.xpn.xwiki.store.query.AbstractQueryManager.createQuery(AbstractQueryManager.java:73)
Looks like the component manager is not initialized when you are
trying to use Query Manager.

You are working in a specific servlet ? In that case you have to
initialize it. You can look at shared-test, webdav work made by Asiri
(in sandbox) or at standard sevlet initialization.
...
at
com.xpn.xwiki.user.impl.openid.OpenIDHelper.findOpenIDUser(OpenIDHelper.java:109)
 at
com.xpn.xwiki.user.impl.xwiki.MyFormAuthenticator.processLogin(MyFormAuthenticator.java:201)
 at
com.xpn.xwiki.user.impl.xwiki.MyFormAuthenticator.processLogin(MyFormAuthenticator.java:178)
 at
com.xpn.xwiki.user.impl.xwiki.XWikiAuthServiceImpl.checkAuth(XWikiAuthServiceImpl.java:205)
 at com.xpn.xwiki.XWiki.checkAuth(XWiki.java:3518)
 at
com.xpn.xwiki.user.impl.xwiki.XWikiRightServiceImpl.checkAccess(XWikiRightServiceImpl.java:139)
 at com.xpn.xwiki.XWiki.checkAccess(XWiki.java:3526)
 at com.xpn.xwiki.XWiki.prepareDocuments(XWiki.java:4432)
 at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:190)
 at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:115)
 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.doPost(ActionServlet.java:432)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
 at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
 at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:287)
 at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:112)
 at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
 at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
 at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
 at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
 at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
 at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
 at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
 at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
 at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
 at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
 at java.lang.Thread.run(Thread.java:619)
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Thomas Mortagne