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Created attachment 835122 [details] reproducer Description of problem: When I set custome log4j log handler configuration, following exception occur. log4j:ERROR Could not create an Appender. Reported error follows. java.lang.ClassCastException: org.apache.log4j.ConsoleAppender cannot be cast to org.apache.log4j.Appender at org.apache.log4j.xml.DOMConfigurator.parseAppender(DOMConfigurator.java:248) at org.apache.log4j.xml.DOMConfigurator.findAppenderByName(DOMConfigurator.java:176) at org.apache.log4j.xml.DOMConfigurator.findAppenderByReference(DOMConfigurator.java:191) at org.apache.log4j.xml.DOMConfigurator.parseChildrenOfLoggerElement(DOMConfigurator.java:523) at org.apache.log4j.xml.DOMConfigurator.parseCategory(DOMConfigurator.java:436) at org.apache.log4j.xml.DOMConfigurator.parse(DOMConfigurator.java:1004) at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:872) at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:755) at org.apache.log4j.xml.DOMConfigurator.configure(DOMConfigurator.java:896) at test.logger.TestLogger.<clinit>(TestLogger.java:13) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:270) at org.jboss.logmanager.config.AbstractPropertyConfiguration.<init>(AbstractPropertyConfiguration.java:74) at org.jboss.logmanager.config.HandlerConfigurationImpl.<init>(HandlerConfigurationImpl.java:54) at org.jboss.logmanager.config.LogContextConfigurationImpl.addHandlerConfiguration(LogContextConfigurationImpl.java:145) --- snip --- Version-Release number of selected component (if applicable): EAP 6.1 EAP 6.2 workaround: Ignore exception, and restart. Steps to Reproduce: 1. Unzip sample.zip under the jboss home directory. 2. Start standalone profile(./standalone.sh). 3. Move the admin-console logging page(http://localhost:9990/console/App.html#logging). admin-console -> Profile -> Core -> Logging 4. Set custom handler, and save. Handler -> Custom -> Add Name : TEST_LOG Log Level : INFO Class Name : test.logger.TestLogger Module : test.log 5. You can confirm ClassCastException in console/server log.
Remove the log4j resource root (<resource-root path="log4j-1.2.17.jar"/>) from the module.xml and add a dependency on org.apache.log4j instead. The issue is log4j is already loaded as a dependency.
Also after another look what are you trying to do here? Just wrap a log4j appender in a J.U.L handler? If so this can already be done with a custom-handler. It was buggy in 6.0 and 6.1, but should be fixed and working fine in 6.2.