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From Harald Wellmann <>
Subject TempClassLoader issue
Date Sat, 13 Oct 2012 14:18:28 GMT
I'm trying to use SLF4J + Logback with TomEE 1.5.0. After setting

openejb.log.factory = org.apache.openejb.util.Slf4jLogStreamFactory

and replacing slf4j-jdk14 in TOMEE_HOME/lib by logback-core and 
logback-classic, I get the following exception:

Failed to instantiate [ch.qos.logback.classic.LoggerContext]
Reported exception:
java.lang.LinkageError: loader constraint violation: when resolving 

the class loader (instance of org/apache/openejb/core/TempClassLoader) 
of the current class, ch/qos/logback/core/joran/event/SaxEventRecorder, 
and the class loader (instance of <bootloader>) for resolved class, 
javax/xml/parsers/SAXParser, have different Class objects for the type 
DefaultHandler;)V used in the signature

Looking at the source code of TempClassLoader, I suppose it should 
delegate org.xml.sax.* to the bootloader but doesn't.

The JRE has some more packages on top of java.*, javax.* and sun.* - 
shouldn't they _all_ be delegated?

Best regards,

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