Accessing edit/remove attachment URL containing a filename with German Umlauts throws NullPointerException

Attaching a File with German Umlauts (e.g. ü, ä or ö) or French accented letters (é, â, ç, etc) in its filename breaks the edit and remove actions on that attachment.

We have two confluence instances, one is confluence-3.2 with MS SQL server, the other one is confluence-3.1 with MySQL. Both run on tomcat 6.0.18 on 32bit debian. It happens on both instances; we pass the encoding test (admin/encodingtest.action) on both confluence instances.

Steps to reproduce

• Attach a file with filename e.g. "test_ä_test.png" to a page
• Try to edit or remove the file

Actual results

• The file cannot be edited or removed; NullPointerException at at com.atlassian.confluence.pages.actions.MoveAttachmentAction.bootstrap(MoveAttachmentAction.java:115); Stacktrace is attached
• Viewing the file works

Expected results

Editing or removing those attachments can be done without fiddling around with the URL

Workaround

The link to editattachment.action and removeattachment.action contains the URL escaped filename:
http://CONFLUENCE_HOST/confluence/pages/editattachment.action?pageId=3997707&fileName=test_%C3%A4_test.png
http://CONFLUENCE_HOST/confluence/pages/removeattachment.action?pageId=3997707&fileName=test_%C3%A4_test.png&version=1

If you call the URL without escaping the umlaut like this:
http://CONFLUENCE_HOST/confluence/pages/editattachment.action?pageId=3997707&fileName=test_ä_test.png
http://CONFLUENCE_HOST/confluence/pages/removeattachment.action?pageId=3997707&fileName=test_ä_test.png&version=1
the attachment can be edited or removed.

Thank you for your help,
Ferdinand