Log4j2 - Error processing element Appender

In Log4j 2 the type of appender is specified in the name of the element, not with a type attribute.

In other words, replace lines such as

    <Appender type="Console" name="STDOUT">

and

    <Appender type="File" name="File" fileName="${filename}">

with

    <Console name="STDOUT">

and

    <File name="File" fileName="${filename}">

See also the Log4j 2 documentation on appenders.

In my case it was wrong element name

<Appenders>
    <RollingRandomAccessFileAppender name="stdout" fileName="../logs/app.log" filePattern="../logs/app.%d{yyMMdd}.%i.log.gz">
...

Correct one is

<Appenders>
    <RollingRandomAccessFile name="stdout" fileName="../logs/app.log" filePattern="../logs/app.%d{yyMMdd}.%i.log.gz">
...

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