Markus Jung created TOMEE-4390:
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Summary: ClassNotFoundException in webapp that has log4j2 and
invokes commons-logging
Key: TOMEE-4390
URL: https://issues.apache.org/jira/browse/TOMEE-4390
Project: TomEE
Issue Type: Bug
Components: TomEE Core Server
Affects Versions: 10.0.0-M2
Reporter: Markus Jung
Attachments: log4j2-commons-logging.zip
Accessing commons-logging throws an exception when it is being invoked in an
application that has a log4j2 dependency but no commons-logging dependency
The layout is basically:
* tomee
** libs/
*** commons-logging.jar
** webapps/ROOT/WEB-INF/libs
*** log4j2-api/core.jar
This causes the following to happen:
# commons-logging checks the current thread classloader for a log4j2 class
# if it finds one, it creates an instance of Log4jApiLogFactory
# while doing so, java tries to load the class
org.apache.logging.log4j.spi.LoggerAdapter using the classloader that loaded
commons-logging.jar
# ClassNotFoundException with a very incomprehensible stacktrace
See attached reproducer, simply run mvn package tomee:run
Stacktrace:
{code:java}
Caused by: java.lang.NoClassDefFoundError:
org/apache/logging/log4j/spi/LoggerAdapter
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:375)
at
org.apache.commons.logging.LogFactory.createFactory(LogFactory.java:419)
at
org.apache.commons.logging.LogFactory.lambda$newFactory$3(LogFactory.java:1431)
at
java.base/java.security.AccessController.doPrivileged(AccessController.java:318)
at
org.apache.commons.logging.LogFactory.newFactory(LogFactory.java:1431)
at
org.apache.commons.logging.LogFactory.getFactory(LogFactory.java:928)
at
org.apache.commons.logging.LogFactory.getLog(LogFactory.java:987)
at com.example.ExampleBean.initApplication(ExampleBean.java:15)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:569)
at
org.apache.webbeans.event.ObserverMethodImpl.invoke(ObserverMethodImpl.java:410)
at
org.apache.webbeans.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:371)
... 49 more
Caused by: java.lang.ClassNotFoundException:
org.apache.logging.log4j.spi.LoggerAdapter
at
java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:445)
at
java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:592)
at
java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:525)
... 64 more
{code}
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