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https://issues.apache.org/jira/browse/LOG4J2-1372?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15249895#comment-15249895
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Kamal Mettananda commented on LOG4J2-1372:
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I analysed the code, and this is related to the way the
org.apache.logging.log4j.core.layout.XmlLayout writes the XML file using all
the Events including a header and a footer.
When <Event>s are written into a XML file; the "Event" object is not the root
element, but an element named <Events>; created using XmlLayout#getHeader() and
XmlLayout#getFooter() methods.
com.fasterxml.jackson.dataformat.xml.util.DefaultXmlPrettyPrinter is used to
print the Event object into an XML; hence it assumes <Event> tag as the root
element, so it prints the <Event> tag without any indentation. So both <Events>
and <Event> tags are having the same (zero) indentation.
> XMLLayout indents, but not the first child tag (<Event>)
> --------------------------------------------------------
>
> Key: LOG4J2-1372
> URL: https://issues.apache.org/jira/browse/LOG4J2-1372
> Project: Log4j 2
> Issue Type: Bug
> Components: Layouts
> Affects Versions: 2.5
> Reporter: Kamal Mettananda
> Priority: Minor
>
> I am using log4j 2.5 to print the logs via XMLLayout. I have set
> compact="true", hence the new line and indents of sub tags work correctly.
> However I have noticed that the first child tag is not indented correctly.
> Following is such a sample where <Events> and <Event> are at the same indent
> level (0 indent).
> {code:xml}
> <?xml version="1.0" encoding="UTF-8"?>
> <Events xmlns="http://logging.apache.org/log4j/2.0/events";>
> <Event xmlns="http://logging.apache.org/log4j/2.0/events";
> timeMillis="1460974404123" thread="main" level="INFO"
> loggerName="com.foo.Bar" endOfBatch="true"
> loggerFqcn="org.apache.logging.log4j.spi.AbstractLogger" threadId="11"
> threadPriority="5">
> <Message>Message flushed with immediate flush=false</Message>
> </Event>
> <Event xmlns="http://logging.apache.org/log4j/2.0/events";
> timeMillis="1460974404133" thread="main" level="INFO"
> loggerName="com.foo.Bar" endOfBatch="true"
> loggerFqcn="org.apache.logging.log4j.spi.AbstractLogger" threadId="11"
> threadPriority="5">
> <Message>Message flushed with immediate flush=false</Message>
> </Event>
> </Events>
> {code}
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