Adam Gent created LOG4J2-587:
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Summary: log4j-1.2-api emulation jar missing classes
Key: LOG4J2-587
URL: https://issues.apache.org/jira/browse/LOG4J2-587
Project: Log4j 2
Issue Type: Bug
Components: log4j 1.2 emulation
Affects Versions: 2.0-rc1
Reporter: Adam Gent
The log4j 1.2 emulation jar does not contain {{AppenderSkeleton}}. There are
several Spring components like spring-amqp that define custom appenders.
Even if you don't reference those appenders because of various class loading
discovery (such as Springs annotation configuration) you will get exceptions
like
{code}
java.lang.NoClassDefFoundError: org/apache/log4j/AppenderSkeleton
at java.lang.Class.getDeclaredMethods0(Native Method)
at java.lang.Class.privateGetDeclaredMethods(Class.java:2531)
at java.lang.Class.getDeclaredMethods(Class.java:1855)
at
org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.findPersistenceMetadata(
{code}
And thus you cannot remove the original log4j-1.2.x jars.
Basically the class just needs to exist to avoid reflection exceptions like the
one above. Unfortunately this is a show stopper for us as we use Spring heavily
and and it appears to happen on any of our spring applications and we don't
allow jars with duplicate classes in our projets.
This appears to be an easy fix... just stub all of the log4j-1.2 classes that
are extendable.
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