How to configure EMA Java to use log4j as the underlying logging backend?​

Susan Genoray
Susan Genoray Contributor
in EMA

In the EMA Java Developer Guide, it mentions that EMA Java can have underlying logging backend to be Java standard logger (java.util.logging), log4j, or other loggers implementing SLF4J logging interface. I want to use log4j logging framework with EMA Java, how to configure EMA Java to use log4j as the underlying logging backend?

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Best Answer

  • Steven McCoy
    Steven McCoy LSEG
    Answer ✓

    EMA/Java uses SLF4J, there are simple drop in jars from each logging API that act as a binding to automatically connect to log4j2 or otherwise.

    For log4j2, simply add the SLF4J API and binding to the class path:

    log4j-api-2.0.jar:log4j-core-2.0.jar:log4j-slf4j-impl-2.0.jar:slf4j-api-1.7.12.jar

    Capture the EMA output with the following in log4j2.xml:

    <Logger name="com.thomsonreuters.ema.access" level="trace" additivity="false">
      <AppenderRef ref="Console"/>
    </Logger>

    For log4j1, use the matching jars per the SLF4J manual:

    slf4j-log4j12-1.7.21.jar:slf4j-api-1.7.21.jar

    For J.U.L., documented on the same page above:

    slf4j-jdk14-1.7.21.jar:slf4j-api-1.7.21.jar

    For Logback, a popular alternative to log4j1:

    logback-classic-1.0.13.jar:logback-core-1.0.13.jar:slf4j-api-1.7.21.jar

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