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https://issues.apache.org/jira/browse/LOG4J2-1256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15103595#comment-15103595
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Ralph Goers commented on LOG4J2-1256:
-------------------------------------
I don't see how not being Serializable would matter at all.
I also don't understand how it could be the wrong ClassLoader since the
constructor for the ThrowableProxy is trying to create the CacheEntry, so the
same ClassLoader that loaded ThrowableProxy should be what is being used.
> strange classloader failure
> ---------------------------
>
> Key: LOG4J2-1256
> URL: https://issues.apache.org/jira/browse/LOG4J2-1256
> Project: Log4j 2
> Issue Type: Bug
> Components: Core
> Affects Versions: 2.5
> Reporter: Dan Armbrust
>
> I am utilizing log4j in a maven mojo extension (code that plugs into maven,
> and executes as part of a mojo build)
> My code is encountering an internal error of its own - but when the code
> attempts to log the error, this happens:
> {code}
> Exception in thread "JavaFX Application Thread"
> java.lang.NoClassDefFoundError:
> org/apache/logging/log4j/core/impl/ThrowableProxy$CacheEntry
> at
> org.apache.logging.log4j.core.impl.ThrowableProxy.toCacheEntry(ThrowableProxy.java:560)
> at
> org.apache.logging.log4j.core.impl.ThrowableProxy.toExtendedStackTrace(ThrowableProxy.java:603)
> at
> org.apache.logging.log4j.core.impl.ThrowableProxy.<init>(ThrowableProxy.java:135)
> at
> org.apache.logging.log4j.core.impl.ThrowableProxy.<init>(ThrowableProxy.java:117)
> at
> org.apache.logging.log4j.core.impl.Log4jLogEvent.getThrownProxy(Log4jLogEvent.java:482)
> at
> org.apache.logging.log4j.core.pattern.ExtendedThrowablePatternConverter.format(ExtendedThrowablePatternConverter.java:64)
> at
> org.apache.logging.log4j.core.pattern.PatternFormatter.format(PatternFormatter.java:36)
> at
> org.apache.logging.log4j.core.layout.PatternLayout$PatternSerializer.toSerializable(PatternLayout.java:292)
> at
> org.apache.logging.log4j.core.layout.PatternLayout.toSerializable(PatternLayout.java:206)
> at
> org.apache.logging.log4j.core.layout.PatternLayout.toSerializable(PatternLayout.java:56)
> at
> org.apache.logging.log4j.core.layout.AbstractStringLayout.toByteArray(AbstractStringLayout.java:148)
> at
> org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:112)
> at
> org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:152)
> at
> org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:125)
> at
> org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:116)
> at
> org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:390)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:378)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:362)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:352)
> at
> org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:63)
> at org.apache.logging.log4j.core.Logger.logMessage(Logger.java:147)
> at
> org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:1011)
> at
> org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:988)
> at
> org.apache.logging.log4j.spi.AbstractLogger.warn(AbstractLogger.java:1264)
> at gov.vha.isaac.ochre.api.task.TimedTask.failed(TimedTask.java:148)
> at javafx.concurrent.Task.setState(Task.java:708)
> at javafx.concurrent.Task$TaskCallable.lambda$call$502(Task.java:1453)
> at
> com.sun.javafx.application.PlatformImpl.lambda$null$174(PlatformImpl.java:295)
> at java.security.AccessController.doPrivileged(Native Method)
> at
> com.sun.javafx.application.PlatformImpl.lambda$runLater$175(PlatformImpl.java:294)
> at
> com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
> at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
> at
> com.sun.glass.ui.gtk.GtkApplication.lambda$null$50(GtkApplication.java:139)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.ClassNotFoundException:
> org.apache.logging.log4j.core.impl.ThrowableProxy$CacheEntry
> at
> org.codehaus.plexus.classworlds.strategy.SelfFirstStrategy.loadClass(SelfFirstStrategy.java:50)
> at
> org.codehaus.plexus.classworlds.realm.ClassRealm.unsynchronizedLoadClass(ClassRealm.java:271)
> at
> org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:247)
> at
> org.codehaus.plexus.classworlds.realm.ClassRealm.loadClass(ClassRealm.java:239)
> ... 35 more
> {code}
> This is very odd to me, as the class not found is an inner class, inside of a
> class that is obviously on the classpath (from the rest of the stack trace)
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