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https://issues.apache.org/jira/browse/LOG4J2-587?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15829700#comment-15829700
]
Jonathan Bayle commented on LOG4J2-587:
---------------------------------------
Stack trace:
{noformat}
[1.0-SNAPSHOT][2017-01-19 10:34:08,968][ERROR] Exception in thread
"symmetric-engine-startup-0" java.lang.NoClassDefFoundError:
org/apache/log4j/AppenderSkeleton (SystemLogHandler.java:267 -
symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,969][ERROR] at
java.lang.ClassLoader.defineClass1(Native Method) (SystemLogHandler.java:267 -
symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,969][ERROR] at
java.lang.ClassLoader.defineClass(ClassLoader.java:763)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,969][ERROR] at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,969][ERROR] at
java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,969][ERROR] at
java.net.URLClassLoader.access$100(URLClassLoader.java:73)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,970][ERROR] at
java.net.URLClassLoader$1.run(URLClassLoader.java:368)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,970][ERROR] at
java.net.URLClassLoader$1.run(URLClassLoader.java:362)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,970][ERROR] at
java.security.AccessController.doPrivileged(Native Method)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,970][ERROR] at
java.net.URLClassLoader.findClass(URLClassLoader.java:361)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,970][ERROR] at
java.lang.ClassLoader.loadClass(ClassLoader.java:424)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,970][ERROR] at
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,970][ERROR] at
java.lang.ClassLoader.loadClass(ClassLoader.java:357)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,970][ERROR] at
org.jumpmind.symmetric.util.LogSummaryAppenderUtils.registerLogSummaryAppender(LogSummaryAppenderUtils.java:40)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,971][ERROR] at
org.jumpmind.symmetric.ClientSymmetricEngine.init(ClientSymmetricEngine.java:170)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,971][ERROR] at
org.jumpmind.symmetric.web.ServerSymmetricEngine.init(ServerSymmetricEngine.java:62)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,971][ERROR] at
org.jumpmind.symmetric.ClientSymmetricEngine.<init>(ClientSymmetricEngine.java:139)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,971][ERROR] at
org.jumpmind.symmetric.web.ServerSymmetricEngine.<init>(ServerSymmetricEngine.java:47)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,971][ERROR] at
org.jumpmind.symmetric.web.SymmetricEngineHolder.create(SymmetricEngineHolder.java:241)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,971][ERROR] at
org.jumpmind.symmetric.web.SymmetricEngineHolder$EngineStarter.run(SymmetricEngineHolder.java:461)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,971][ERROR] Caused by:
java.lang.ClassNotFoundException: org.apache.log4j.AppenderSkeleton
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,971][ERROR] at
java.net.URLClassLoader.findClass(URLClassLoader.java:381)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,972][ERROR] at
java.lang.ClassLoader.loadClass(ClassLoader.java:424)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,972][ERROR] at
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,972][ERROR] at
java.lang.ClassLoader.loadClass(ClassLoader.java:357)
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
[1.0-SNAPSHOT][2017-01-19 10:34:08,972][ERROR] ... 19 more
(SystemLogHandler.java:267 - symmetric-engine-startup-0)
{noformat}
> 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
> Labels: easyfix
>
> 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.
> The log4j SLF4J bridge does in fact contain the appender skeleton:
> http://www.slf4j.org/api/org/apache/log4j/package-summary.html
> Consequently a not so ideal workaround is to just use
> {{log4j-over-slf4j.jar}} which does contain the AppenderSkeleton.
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