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From Rob Brown <rlb.so...@gmail.com>
Subject NoClassDefFoundError accessing jackrabbit jar from servlet
Date Tue, 30 Mar 2010 04:13:34 GMT

My first attempt at sending this failed b/c I attached a zip file. Sorry if
this is a duplicate message for some.

I'm getting the above mentioned error when trying to access a repository
using jackrabbit-standalone-2.0.0.jar from a servlet. I didn't use the
jackrabbit war because I already have a thick client app working and I want
to reuse as much code as possible. I just assumed doing this was possible.

If I do the exact same thing from a thick client (Swing) window the error
does not occur. The problem seems to be related to class loading from a
servlet. I have got the same results in Tomcat 5.5 and in the eclipse
embedded web server.

To test I created a small web application. Since I cannot attach a zip file
I will just copy the doPost() method below:

    protected void doPost(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {

        Repository repository = new TransientRepository(
                "repository.xml", //embedded within the war
            Session session = null;
        try {
            session = repository.login();
            System.out.println("root node identifier: " +
        } catch (Exception e) {
        } finally {

When I post to this servlet from an html form the exception has 2 parts:
    java.lang.NoClassDefFoundError: javax/jcr/Repository
    java.lang.ClassNotFoundException: javax.jcr.Repository

I found a link to a similar issue that may relate to what's happening:

The first reply to this query says:
"That can happen e.g. if your class is found but it executes a static
initialiser (i.e. a public static final assignment) that uses another class
that's not exported by the system bundle."

I'm not using Equinox or anything other than Eclipse for EE developers.
Perhaps it's related to a bundle issue within jackrabbit.

Is accessing a repository in this way from a servlet (i.e. using the
jackrabbit jar not war) not a supported function, or just not a good idea in
general? My goals are to keep the code as simple as possible and minimize
the attack surface for troublemakers (i.e. I do not want to expose REST or
any other jackrabbit servlet api to an experienced hacker who might
recognize what library I am using). I'm handling all user authentication in
my app already and only want my java domain objects to make calls to the

Thanks in advance for any assistance you can offer. Comments about the
security implications of this approach vs. the jackrabbit war are also most


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