Are you checking out the document node before you check on its version
history?  If not, that might cause the problem.

Also, if you're removing the document node, you probably have to check out
its parent.

-Brian



On 4/3/07, Lubos and Alena Pochman <pochmans@gmail.com> wrote:
>
> I would like to implement rollback function for the versioned node. If
> node
> has only one version, the node itself is removed. If there is more then
> one
> version
> of the node, the root (top, head) node is removed. I tried v.remove() or
> history.removeVersion(v.getName()), but both fail with exception:
>
> javax.jcr.nodetype.ConstraintViolationException:
>
> /jcr:system/jcr:versionStorage/23/4c/e0/234ce0e4-4a6a-435c-a4b4-7a8e3fe4f2cf/jcr:rootVersion:
> cannot remove a protected node
>
> Here is the code:
>
>             VersionHistory history = document.getVersionHistory();
>             VersionIterator ito = history.getAllVersions();
>             if (ito.hasNext()) {
>                 Version v = ito.nextVersion(); // Top version
>                 if (ito.hasNext())
>                     v.remove();
>                 else
>                     document.remove();
>                 session.save();
>             }
>
>
> My question is, is it possible or do I have to use workaround like create
> new version from version head-1 (create new version) and then remove the
> original root version and the original head-1 version?
>
> Thanks, Lubos
>