log4j configuration file for json logging

json.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
Be aware that this is a configuration file for Apache log4j,
This example file will log json files but there are many other configurations
You can also use files such as ../sql.xml as well.
-->

<Configuration status="info">
    <Appenders>
        <Console name="ConsoleJSONAppender" target="SYSTEM_OUT">
            <JsonLayout complete="false" compact="true"/>
        </Console>
        <File name="FileJSONAppender" fileName="logs/node.json" immediateFlush="false" append="true">
            <JsonLayout complete="false" compact="true" properties="true" eventEol="true"/>
        </File>
    </Appenders>
    <Loggers>
        <Root level="info">
            <AppenderRef ref="ConsoleJSONAppender"/>
            <AppenderRef ref="FileJSONAppender"/>
        </Root>
        <Logger name="net.corda" level="info" additivity="false">
            <AppenderRef ref="ConsoleJSONAppender"/>
            <AppenderRef ref="FileJSONAppender"/>
        </Logger>
        <Logger name="com.r3.corda" level="info" additivity="false">
            <AppenderRef ref="ConsoleJSONAppender"/>
            <AppenderRef ref="FileJSONAppender"/>
        </Logger>
        <Logger name="org.hibernate" level="info" additivity="false">
            <AppenderRef ref="ConsoleJSONAppender"/>
            <AppenderRef ref="FileJSONAppender"/>
        </Logger>
    </Loggers>
</Configuration>