The file applicationContext-externalAuth-LDAP-mt.xml has a missing value as states the log file in the indicated line.
<property name="groupSearchFilter" value="(&(objectCategory=person)(objectClass=user)(!(userAccountControl:1.2.840.113522.214.171.1241:=2)))"/>
The facelets are a XML based view technology which uses XHTML+XML to generate HTML output. XML has five special characters which has special treatment by the XML parser:
< the start of a tag.
> the end of a tag.
" the start and end of an attribute value.
' the alternative start and end of an attribute value.
& the start of an entity (which ends with ;).
In case of an & which is not followed by # (e.g.  ,  , etc), the XML parser is implicitly looking for one of the five predefined entity names lt, gt, amp, quot and apos, or any manually defined entity name.
In this case the line had only & and missed the predefined entity name plus the ;