How to get Log4j2, Tomcat and Chainsaw work together?

[Kari Arvonen]

Hello,

Versions:
- Apache Log4j2 2.0 release version
- Apache Tomcat 7.0.54
- Apache Chainsaw 2.1 snapshot (http://people.apache.org/~sdeboy/)
- Oracle Java SE 7 u60 JDK

I have tried to get the XMLLayout to work with Log4j2 assuming it is the
best format for Chainsaw. What is preferred way to do this?

In any case current log4j2.xml placed in one of the Webapps WEB-INF\classes
-directory
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="ALL">
  <Appenders>
    <File name="XmlFile" fileName="logs/0000Atest.log"
immediateFlush="true" append="true">
      <XMLLayout complete="true" charset="UTF-8" compact="false"/>
    </File>
  </Appenders>

  <Loggers>
    <AsyncRoot level="ALL" includeLocation="false">
      <AppenderRef ref="XmlFile"/>
    </AsyncRoot>
  </Loggers>
</Configuration>

Configuration is read properly. Where I have been struggling is which jars
and which versions to include. I have tried various versions and seem to
have always either class not found or implementation missing.

Jars and versions:
- log4j-api-2.0.jar, log4j-core-2.0.jar, log4j-web-2.0.jar,
log4j-1.2-api-2.0.jar
- disruptor-3.2.1.jar
- jackson-annotations-2.4.1.jar, jackson-core-2.4.1.1.jar,
jackson-databind-2.4.1.2.jar
- jackson-dataformat-xml-2.4.1.jar, jackson-datatype-jdk7-2.4.1.jar,
jackson-datatype-json-org-2.4.1.jar,
jackson-module-jaxb-annotations-2.4.1.jar
- stax2-api-3.1.4.jar

I have tried with less jars and various version combinations without
success. Best I have had is log gets written, but only actual text to be
logged not with full XML events. Non XML-layout worked fine.

Code snippets in webapp servlet:
// Log4J 2.x
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.EventLogger;

private Logger log = null;

this.log = LogManager.getLogger(EventReceiverServlet.class.getName());

log.info("Logger initiated");
log.debug("åäöÅÄÖ");
log.debug("Добро пожаловать.");

Latest exception:
SEVERE: Exception processing: 0
org.apache.logging.log4j.core.async.AsyncLoggerConfigHelper$Log4jEventWrapper@1045e84
java.lang.NoSuchMethodError:
com.fasterxml.jackson.databind.util.LRUMap.put(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
at
com.fasterxml.jackson.dataformat.xml.util.XmlRootNameLookup.findRootName(XmlRootNameLookup.java:83)

Any help would  be appreciated.

Regards, Suomilapsi