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https://issues.apache.org/jira/browse/LOG4J2-3179?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Volkan Yazici closed LOG4J2-3179.
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> Unable to programmatically configure additional fields for JsonLayout plugin
> using LayoutComponentBuilder.
> ----------------------------------------------------------------------------------------------------------
>
> Key: LOG4J2-3179
> URL: https://issues.apache.org/jira/browse/LOG4J2-3179
> Project: Log4j 2
> Issue Type: Question
> Components: Layouts
> Affects Versions: 2.14.1
> Environment: Java 1.8
> Windows 10
> Reporter: Mark Linley
> Assignee: Volkan Yazici
> Priority: Major
>
> Hi
> I am unable to programmatically configure the JsonLayout plugin to include
> custom additional fields. I cannot see a way of doing this using the
> LayoutComponentBuilder. I have tried various approaches like trying to
> configure it like other attributes e.g.:
> {quote}LayoutComponentBuilder layoutBuilder = builder
> .newLayout("JsonLayout")
> .addAttribute("compact", "true")
> .addAttribute("eventEol", "true")
> .addAttribute("AdditionalField", builder.newKeyValuePair("testfield",
> "testvalue"));
> {quote}
> However, no matter what name I try and use as a 'key' for additional fields I
> always get the error
> {quote}2021-10-19 14:09:52,121 main ERROR JsonLayout contains an invalid
> element or attribute "AdditionalField"
> {quote}
> This is easily achievable via the XML configuration e.g.:
> <JSONLayout compact="true" eventEol="true">
> <KeyValuePair key="testfield" value="testvalue"/>
> </JSONLayout>
> The one thing that came to mind is that 'KeyValuePair' is not an attribute of
> JSONLayout like 'compact' and 'eventEol'. Rather it is a sub-element so using
> .addAttribute could be where I am going wrong here. However, I cannot see any
> other obvious methods in LayoutComponentBuilder to achieve this.
> I have been able to use:
> {quote}.addAttribute("properties", "true")
> .addAttribute("propertiesAsList", "true")
> {quote}
> This will include any entries added to the ThreadContext map when logging the
> events which allows me to set variables I need at run time but ideally I
> don't want to have the outputted JSON including a map or list definition I
> need to further parse. I need the fields to simply be added as simple
> variables to the higher level JSON map like everything else and like how it
> is done when using the XML configuration above.
> Looking at the documentation, I cannot find any examples of how to
> programmatically configure additional fields for the JSONLayout plugin so I
> would like to know what I am missing in the part of the API I am using above?
> I feel that what I am able to achieve via XML configuration should be
> achievable programmatically using the API.
> Any help or guidance would be much appreciated.
> Thanks
> Mark
>
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