Mark Linley created LOG4J2-3179:
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Summary: Unable to programmatically configuring additional fields
for JsonLayout plugin using LayoutComponentBuilder.
Key: LOG4J2-3179
URL: https://issues.apache.org/jira/browse/LOG4J2-3179
Project: Log4j 2
Issue Type: Improvement
Components: Layouts
Affects Versions: 2.14.1
Environment: Java 1.8
Windows 10
Reporter: Mark Linley
Fix For: 2.14.1, 2.13.3
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 to 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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