[slf4j-dev] [Bug 79] NullPointerException in SLF4JLocationAwareLog.debug

[bugzilla-daemon at pixie.qos.ch]

http://bugzilla.slf4j.org/show_bug.cgi?id=79





--- Comment #15 from Eric Vargo <evargo at business.com>  2009-03-05 18:59:15 ---
Here is the relevant info about my environment:

jdk 1.5.0_15
tomcat 6.0.18
spring 2.5.6
slf4j 1.5.6
jcl over slf4j 1.5.6

I'm not doing the serialization myself, Tomcat is.  I see this error when
Tomcat invalidates a session.  We place objects into Spring's session scope,
and I believe when this happens, a spring wrapper is place around our objects. 
The error is in some code that spring is running from an event tied to
valueUnbound.  The spring code is using JCL for logging and it eventually tries
to call isDebugEnabled() and that is when I see the error.  Here is a sample
stacktrace:

java.lang.NullPointerException
        at
org.apache.commons.logging.impl.SLF4JLocationAwareLog.isDebugEnabled(SLF4JLocationAwareLog.java:59)
        at
org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.buildLifecycleMetadata(InitDestroyAnnotationBeanPostProcessor.java:201)
        at
org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.findLifecycleMetadata(InitDestroyAnnotationBeanPostProcessor.java:182)
        at
org.springframework.beans.factory.annotation.InitDestroyAnnotationBeanPostProcessor.postProcessBeforeDestruction(InitDestroyAnnotationBeanPostProcessor.java:160)
        at
org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:140)
        at
org.springframework.beans.factory.support.DisposableBeanAdapter.run(DisposableBeanAdapter.java:134)
        at
org.springframework.web.context.request.ServletRequestAttributes$DestructionCallbackBindingListener.valueUnbound(ServletRequestAttributes.java:269)
        at
org.apache.catalina.session.StandardSession.removeAttributeInternal(StandardSession.java:1654)
        at
org.apache.catalina.session.StandardSession.expire(StandardSession.java:756)

Let me know if you need more info from me.


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