Natan, Thanks for the informaiton. Could I ask you to file a jira issue? Natan Cox wrote:

Hi,

I'm trying to use a converter in HtmlLayout but it was not logged correctly. I'm basically getting a "PARSER_ERRER".

I checked the code and found

HTMLLayoutBase.start() does this.head = p.compile(t, getDefaultConverterMap());

where protected Map<String, String> getDefaultConverterMap() { return PatternLayout.defaultConverterMap; }

But PatternLayoutBase.start() does this.head = p.compile(t, getEffectiveConverterMap()); and getEffectiveConverterMap loads the extra converters.

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