I don't understand why you use XWiki#getXWiki, this method job is to
initialize everything related to the request which you usually don't
care in a background thread (in as you can see in your case does not
work since you don't have an request in that thread).
A good helper when you need a usable XWikiContext wherether you are in
the XWikiContext provider as in:
@Inject
Provider<XWikiContext> xcontext;
it gives you the current context in a request thread and one suitable
for background thread otherwise.
On Mon, Sep 30, 2013 at 11:57 PM, Jeremie BOUSQUET
<jeremie.bousquet(a)gmail.com> wrote:
  Hello,
 I'm trying to save a document from inside a job [1] execution, as follows
 roughly:
 xwiki.getXWiki(context).saveDocument(doc, comment, context);
 Nothing really special ... It used to work (out of a job), but now it
 throws NPE:
 <trace>com.xpn.xwiki.XWiki.stripSegmentFromPath(XWiki.java:4725)</trace>
 <trace>com.xpn.xwiki.XWiki.getRequestWikiName(XWiki.java:566)</trace>
 <trace>com.xpn.xwiki.XWiki.getXWiki(XWiki.java:492)</trace>
<trace>org.xwiki.contrib.mailarchive.internal.persistence.XWikiPersistence.saveAsUser(XWikiPersistence.java:678)</trace>
 Checking source code, it happens there (sorry, I roughly decompiled it):
 /*  560 */     if ("1".equals(Param("xwiki.virtual.usepath",
"1"))) {
 /*  561 */       String uri = request.getRequestURI();
 /*  562 */       if (LOGGER.isDebugEnabled()) {
 /*  563 */         LOGGER.debug("Request uri is: " + uri);
 /*      */       }
 /*      */
 /*  566 */       uri = stripSegmentFromPath(uri, request.getContextPath());
 From the logs in DEBUG, I see:
 "Request uri is: null"
 ... which is kind of logical I believe, as I'm in a Thread triggered by
 another thread, and not directly in an http request.
 I'm not sure of what I should do from here ... And if my analysis is
 correct, or if something else is wrong. Maybe I should do something with
 ExecutionContext ...
 Thanks,
 BR,
 Jeremie
 [1] 
http://extensions.xwiki.org/xwiki/bin/view/Extension/Job+Module
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