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When using the autocomplete offering to close any XML tag, the autocomplete suggestion CHANGES THE CASE of the closing tag to lower case. However, case is significant in XML so if the closing tag has different case, the file cannot be parsed as XML. This affects editing XML, HTML and JSP files. Third party JSP tag libraries can and do provide tags which use camel case, for example Apache Tomahawk's tag library includes <t:htmlTag>. The NetBeans editor autocomplete offers </t:htmltag> which is subtly different and definitely incorrect.
*** This issue has been marked as a duplicate of 108560 ***