[logback-dev] [JIRA] Commented: (LBCLASSIC-74) NullPointerException in Logger after container restart

[Ceki Gulcu (JIRA)]

    [ http://jira.qos.ch/browse/LBCLASSIC-74?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=10832#action_10832 ] 

Ceki Gulcu commented on LBCLASSIC-74:
-------------------------------------

I can reproduce the following exception, under Tomcat 5.0.26 and Tomcat 6.0.18.

java.lang.NullPointerException
	ch.qos.logback.classic.Logger.callTurboFilters(Logger.java:791)
	ch.qos.logback.classic.Logger.isDebugEnabled(Logger.java:646)
	ch.qos.logback.classic.Logger.isDebugEnabled(Logger.java:629)
	test.LogbackTest.testLogger(LogbackTest.java:15)
	org.apache.jsp.index_jsp._jspService(index_jsp.java:60)

After a little analysis, I think the problem is due to the fact that Tomcat saves the session, and when the application
restarts, it deserializes the LoggerTest object which contains a field referencing a logger. However, this field does not 
contain a valid reference to a LoggerContext. 

Problem is solved in revision 1897.


> NullPointerException in Logger after container restart
> ------------------------------------------------------
>
>                 Key: LBCLASSIC-74
>                 URL: http://jira.qos.ch/browse/LBCLASSIC-74
>             Project: logback-classic
>          Issue Type: Bug
>    Affects Versions: 0.9.9
>         Environment: Eclipse 3.4, Java 5, Tomcat 5.5.26, plain JSP (no servlet)
>            Reporter: Manel Clos
>            Assignee: Ceki Gulcu
>            Priority: Critical
>             Fix For: 0.9.12
>
>         Attachments: minimalwebapp.zip
>
>
> Hi,
> loggerContext in the Logger class is null after container restart. This will produce a NPE when trying to further use logback.
> java.lang.NullPointerException
> 	at ch.qos.logback.classic.Logger.callTurboFilters(Logger.java:775)
> 	at ch.qos.logback.classic.Logger.isDebugEnabled(Logger.java:630)
> 	at ch.qos.logback.classic.Logger.isDebugEnabled(Logger.java:613)
> 	at test.LogbackTest.testLogger(LogbackTest.java:15)

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