Log4J2 and Wildlfy 26.1.1.Final ClassCastException

[Jason Reed]

Hello,

We are attempting to get our web application using Log4j2 to run under Wildfly 26.1.1.Final. Currently we are receiving this exception on startup

Caused by: java.lang.ClassCastException: org.jboss.logmanager.log4j.JBossLoggerContext incompatible with org.apache.logging.log4j.core.LoggerContext

We have attempted to exclude the various JBoss logging used in Wildfly using the jboss-deployment-structure.xml based on many of the explained comments on StackOverflow, yet we have not yet found a solution.

So how does everyone else use Log4j2 with Wildfly 26?

[J. Alejandro Zepeda Cortés]

Hi,

We use this without issues:

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

...

private static final Logger LOGGER = LogManager.getLogger(SomeClass.class);

...

if (LOGGER.isDebugEnabled())
{
LOGGER.debug("stuff");
}

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J. Alejandro Zepeda Cortés
Ing. Civil Informático
+56998184077
jalejand...@gmail.com
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[James Perkins]

Sorry, I accidentally replied privately instead of to the group.

The error you're seeing is because you are including log4j-core in your deployment.

The simplest solution is to just use the log4j-api and allow the logging subsystem to configure logging.

If you want to use a log4j configuration file, then you need to exclude the org.apache.logging.log4j.api module from your deployment https://docs.wildfly.org/26.1/Admin_Guide.html#how-do-i-log4j2. You then need to include the log4j-api in your deployment.

[Jason Reed]

Thanks for that information. That should get us going on the right track.