Thank you for your reply Clemens. I will check the
precise release of my
 JVM and I'll tell you.
 Maxime
 2013/11/4 Clemens Klein-Robbenhaar <c.robbenhaar(a)espresto.com>
  Hi Maxime,
  Hi XWikiers,
 I just installed a XWiki Enterprise 5.2 using the exe installer on my
 windows laptop.
 I then connected successfully as Admin and tried to install extensions
 using the Extension Manager. But the answers to my queries are always : 
 "no
  extensions found".
 In the XWiki command window, I found theses lines : 
 [....]
  Caused by: java.lang.LinkageError: JAXB 2.0 API
is being loaded from the
 bootstrap classloader, but this RI (from
 
jar:file:/C:/tools/XWikiEnterprise5.2/webapps/xwiki/WEB-INF/lib/jaxb-impl-2.1.12.jar!/com/sun/xml/bind/v2/model/impl/ModelBuil
  der.class) needs 2.1 API. Use the endorsed
directory mechanism to place
 jaxb-api
 .jar in the bootstrap classloader. (See
 
http://java.sun.com/j2se/1.5.0/docs/guid
 e/standards/)
 
 Any chance the installer ran with a java 1.5 by accident?
  I suppose it's caused by my old java 1.6
version, but it's supported (
 
 http://platform.xwiki.org/xwiki/bin/view/AdminGuide/Installation#HPrerequis…
  ).
 Could someone confirm that I'm right ? Thank you.
 
 The alternative is that you are using a quite old 1.6; I think only since
 1.6u04 java comes with JAXB 2.1 instead of 2.0
 This might be an inconsistency that might have slipped in because most
 people who test with java 1.6 use the latest updates.
 Clemens
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