Symptoms

A user is unable to create a page. The following appears in the atlassian-confluence.log:

Cause:
java.util.regex.PatternSyntaxException: Unexpected character '?' near index 74 {((?:??)|(?:*)|(?:^)|(?:~)|(?:_)|(?|(?:+)|(?:)|(?:))}(?![{\p{L}\p{Nd}]) ^
at java.util.regex.Pattern.error(Pattern.java:1472)

Cause

This is a known problem when using older version of 1.4 JDK.

Resolution

Upgrading the JDK to version 1.4.2 or later fixed the problem. Check the system requirements page for further information.