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Editorial Team
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Asked: 2026-06-11T21:45:09+00:00

I have a java class which creates a custom classloader based on javassist class

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I have a java class which creates a custom classloader based on javassist class loader on start up and then run the real program class.
I’m getting the following error: 

log4j:ERROR A "org.apache.log4j.ConsoleAppender" object is not assignable to a        
"org.apache.log4j.Appender" variable.
log4j:ERROR The class "org.apache.log4j.Appender" was loaded by 
log4j:ERROR [javassist.Loader@6f97b10a] whereas object of type 
log4j:ERROR "org.apache.log4j.ConsoleAppender" was loaded by 
[java.net.URLClassLoader@5b414a8d].
log4j:ERROR Could not instantiate appender named "stdout".

The problem is related to the fact that one object is created by the original classloader while the other is created by the custom one.
Is there a way to resolve this error?

Thanks in advance,
Avner

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1 Answer

  1. Editorial Team

    Please try to set -Dlog4j.ignoreTCL=true, hope it helps. a simular issue about log4j

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