Editing EPrints 3.4.3 (section)

==== RIOXX2 plugin field validation leads to internal server error ====
When upgrading if you have the [http://bazaar.eprints.org/390/ RIOXX2 plugin] installed then this can lead to an internal server error when trying to edit an eprint item.  This is due to a combination of issue.
# The RIOXX2 plugin has its own MetaField type that has a <code>validate</code> that calls the <code>validate</code> method of the underlying MetaField but without providing the data object as a parameter.  
# When this underlying validate method calls the <code>EP_TRIGGER_VALIDATE_FIELD</code> this initiate the trigger method in <tt>lib/cfg.d/user_password_maxlength.pl</tt>.  This  trigger expect the data object to be set under the variable <code>$user</code> but is is not and therefore fails when trying to call the <code>isa</code> method on it, which is not possible when it is undefined.
Both the RIOXX2 plugin and <tt>lib/cfg.d/user_password_maxlength.pl</tt> should be patched.  The former to avoid any other trigger methods from causing an internal server error in a similar way and the latter to work round the bug in the RIOXX2 field's <code>validate</code> method. [https://github.com/eprints/eprints3.4/commit/0904940a1d68f3e92317bb3bae1e33888c777b36 This is the patch] for the latter.  Any future versions of the RIOXX2 plugin should hopefully have a patch to ensure the data object is sent as a parameter to the underlying field's <code>validate_method</code>.