Log4j2 ClassLoading problem #10312
Description
When using custom code in combination with our container image (or when configurations.allowCustomClasses=true) the application appender will attempt to render classes using the 'application ClassLoader'. These classes are not always availabe when the code is loaded through one of our ConfigurationClassLoaders.
This causes the following Log4J2 exception:
2026-01-21T13:27:17.646390600Z main ERROR An exception occurred processing Appender application-log-appender
org.apache.logging.log4j.core.appender.AppenderLoggingException: java.lang.NoClassDefFoundError: org/frankframework/core/IPushingListener
at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:164)
at org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:133)
at org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:124)
at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:88)
at org.apache.logging.log4j.core.appender.routing.RoutingAppender.append(RoutingAppender.java:256)
at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:160)
at org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:133)
at org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:124)
at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:88)
at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:711)
at org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:669)
at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:645)
at org.apache.logging.log4j.core.config.LoggerConfig.logParent(LoggerConfig.java:702)
at org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:671)
at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:645)
at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:589)
at org.apache.logging.log4j.core.config.DefaultReliabilityStrategy.log(DefaultReliabilityStrategy.java:73)
at org.apache.logging.log4j.core.Logger.log(Logger.java:187)
at org.apache.logging.log4j.spi.AbstractLogger.tryLogMessage(AbstractLogger.java:2970)
at org.apache.logging.log4j.spi.AbstractLogger.logMessageTrackRecursion(AbstractLogger.java:2922)
at org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely(AbstractLogger.java:2904)
at org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:2648)
at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:2587)
at org.apache.logging.log4j.spi.AbstractLogger.error(AbstractLogger.java:824)
at org.frankframework.lifecycle.events.MessageEvent.<init>(MessageEvent.java:71)
at org.frankframework.lifecycle.events.ApplicationMessageEvent.<init>(ApplicationMessageEvent.java:43)
at org.frankframework.configuration.IbisContext.log(IbisContext.java:408)
at org.frankframework.configuration.IbisContext.createAndConfigureConfigurationWithClassLoader(IbisContext.java:382)
at org.frankframework.configuration.IbisContext.load(IbisContext.java:307)
at org.frankframework.configuration.IbisContext.load(IbisContext.java:259)
at org.frankframework.configuration.IbisContext.init(IbisContext.java:134)
at org.frankframework.configuration.IbisContext.init(IbisContext.java:99)
at org.frankframework.lifecycle.FrankApplicationInitializer.onStartup(FrankApplicationInitializer.java:78)
at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:171)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4877)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1345)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1335)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:145)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:876)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:845)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1345)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1335)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.base/java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:145)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:876)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:240)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:470)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:947)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:171)
at org.apache.catalina.startup.Catalina.start(Catalina.java:757)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:345)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:473)
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