[logback-user] Redeploying application on Tomcat 5.5 gives NullPointerException

[Thorbjørn Ravn Andersen]

I just redeployed a WAR file on a Windows based Tomcat 5.5. server, 
after which reloading the login jsp-page resulted in the following stack 
trace:

java.lang.NullPointerException
    ch.qos.logback.classic.spi.LoggingEvent.<init>(LoggingEvent.java:121)
    
ch.qos.logback.classic.Logger.buildLoggingEventAndAppend(Logger.java:437)
    ch.qos.logback.classic.Logger.filterAndLog_0_Or3Plus(Logger.java:393)
    ch.qos.logback.classic.Logger.log(Logger.java:812)
    
org.apache.commons.logging.impl.SLF4JLocationAwareLog.debug(SLF4JLocationAwareLog.java:120)
    
org.apache.catalina.connector.Request.getRequestDispatcher(Request.java:1219)
    
org.apache.catalina.connector.RequestFacade.getRequestDispatcher(RequestFacade.java:569)
    
org.apache.myfaces.context.servlet.ServletExternalContextImpl.dispatch(ServletExternalContextImpl.java:402)
    
org.apache.myfaces.application.jsp.JspViewHandlerImpl.renderView(JspViewHandlerImpl.java:234)
    
org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:384)
    javax.faces.webapp.FacesServlet.service(FacesServlet.java:138)
    
org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:144)
    
com.foo.axsWHSweb.servlet.filters.LoggedInToAxsFreightFilter.doFilter(LoggedInToAxsFreightFilter.java:59)

There is jcl-over-slf4j-1.5.5.jar, slf4j-api1.5.6, logback-classic 
0.9.14 and logback-core-0.9.14 in the classpath.  Is this a known and 
fixed issue (so I should upgrade all to the newest) or should I investigate?

I believe there has been added an appender in logback.xml with a layout 
based on a class not present in the previous version of the war.

-- 
  Thorbjørn Ravn Andersen  "...plus... Tubular Bells!"