StackOverflow raised in EAP 6 by TRACE classloading logging

Solution Verified - Updated 2 Aug 2024

Environment

JBoss Enterprise Application Platform (EAP) 6.x

Issue

We see a Stackoverflow like the following:

java.lang.StackOverflowError
	at org.jboss.modules.log.JDKModuleLogger.trace(JDKModuleLogger.java:129) [:1.3.3.Final-redhat-1]
	at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:203) [:1.3.3.Final-redhat-1]
	at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:459) [:1.3.3.Final-redhat-1]
	at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:408) [:1.3.3.Final-redhat-1]
	at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:389) [:1.3.3.Final-redhat-1]
	at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:134) [:1.3.3.Final-redhat-1]
	at org.apache.log4j.JBossAppenderHandler.doPublish(JBossAppenderHandler.java:41)
	at org.jboss.logmanager.ExtHandler.publish(ExtHandler.java:79) [:1.5.2.Final-redhat-1]
	at org.jboss.logmanager.LoggerNode.publish(LoggerNode.java:296) [:1.5.2.Final-redhat-1]
	at org.jboss.logmanager.LoggerNode.publish(LoggerNode.java:304) [:1.5.2.Final-redhat-1]
	at org.jboss.logmanager.LoggerNode.publish(LoggerNode.java:304) [:1.5.2.Final-redhat-1]
	at org.jboss.logmanager.LoggerNode.publish(LoggerNode.java:304) [:1.5.2.Final-redhat-1]
	at org.jboss.logmanager.Logger.logRaw(Logger.java:721) [:1.5.2.Final-redhat-1]
	at org.jboss.logmanager.Logger.logRaw(Logger.java:731) [:1.5.2.Final-redhat-1]
	at org.jboss.logmanager.Logger.log(Logger.java:367) [:1.5.2.Final-redhat-1]
	at org.jboss.modules.log.JDKModuleLogger.doLog(JDKModuleLogger.java:109) [:1.3.3.Final-redhat-1]
	at org.jboss.modules.log.JDKModuleLogger.doLog(JDKModuleLogger.java:101) [:1.3.3.Final-redhat-1]
	at org.jboss.modules.log.JDKModuleLogger.trace(JDKModuleLogger.java:129) [:1.3.3.Final-redhat-1]
	at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:203) [:1.3.3.Final-redhat-1]
	at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:459) [:1.3.3.Final-redhat-1]
	at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:408) [:1.3.3.Final-redhat-1]
	at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:389) [:1.3.3.Final-redhat-1]
	at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:134) [:1.3.3.Final-redhat-1]
	at org.apache.log4j.JBossAppenderHandler.doPublish(JBossAppenderHandler.java:41)
	at org.jboss.logmanager.ExtHandler.publish(ExtHandler.java:79) [:1.5.2.Final-redhat-1]
	at org.jboss.logmanager.LoggerNode.publish(LoggerNode.java:296) [:1.5.2.Final-redhat-1]
	at org.jboss.logmanager.LoggerNode.publish(LoggerNode.java:304) [:1.5.2.Final-redhat-1]
	at org.jboss.logmanager.LoggerNode.publish(LoggerNode.java:304) [:1.5.2.Final-redhat-1]
	at org.jboss.logmanager.LoggerNode.publish(LoggerNode.java:304) [:1.5.2.Final-redhat-1]
	at org.jboss.logmanager.Logger.logRaw(Logger.java:721) [:1.5.2.Final-redhat-1]
	at org.jboss.logmanager.Logger.logRaw(Logger.java:731) [:1.5.2.Final-redhat-1]
	at org.jboss.logmanager.Logger.log(Logger.java:367) [:1.5.2.Final-redhat-1]
	at org.jboss.modules.log.JDKModuleLogger.doLog(JDKModuleLogger.java:109) [:1.3.3.Final-redhat-1]
	at org.jboss.modules.log.JDKModuleLogger.doLog(JDKModuleLogger.java:101) [:1.3.3.Final-redhat-1]
	at org.jboss.modules.log.JDKModuleLogger.trace(JDKModuleLogger.java:129) [:1.3.3.Final-redhat-1]
	at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:203) [:1.3.3.Final-redhat-1]
	at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:459) [:1.3.3.Final-redhat-1]
	at org.jboss.modules.ConcurrentClassLoader.performLoadClassChecked(ConcurrentClassLoader.java:408) [:1.3.3.Final-redhat-1]
	at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:389) [:1.3.3.Final-redhat-1]
	at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:134) [:1.3.3.Final-redhat-1]

Resolution

Disable global TRACE logging or TRACE logging for org.jboss.modules

Root Cause

This recursion showed that the following happened:
1. A class is being loaded.
2. The class loading generates a trace message.
3. While logging that trace classloader message, the logger needs to load a class.
4. That next class loading task generates another trace message.
  And then steps 3 and 4 repeat until the thread stack is exhausted

SBR

Product(s)

Red Hat JBoss Enterprise Application Platform

Components

jbossas

Category

Troubleshoot

Tags

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