See also http://java.sun.com/javase/6/docs/api/java/util/concurrent/locks/Lock.html

This issue was discussed on the logback-dev list in Feb 2009 under the subject 
"IllegalMonitorStateException inAppenderAttachableImpl.appendLoopOnAppenders()"

  logback-access uses it as well.
  
- Added unit tests in relation with default component class mapping rules in Joran. 
  See also jira issue LBCLASSIC-103

Joran is now able to assume a default type for nested components according
to rules declared in a JoranConfigurator instance. The rules are located in
an instance of the DefaultNestedComponentRegistry class. 

Thus, in many cases it will no longer be necessary to declare the class of a
component in configuration files.

Since the logback-classic and logback-access modes have their own JoranConfigurator
classes, it is now possible to register rules specific to each logback module.
For example, there is now a rule which maps the layout of an appender to a 
c.q.l.classic.PatternLayout instance for all appenders in  logback-classic and to
and instance of c.q.l.access.PatternLayout for all appenders in logback-access.

This is still ongoing and incomplete work.

as an attribute and not as a nested element. However, the code still honors the old covention.

Fixes LBCLASSIC-104.

The prepareForDeferredProcessing() method in LoggingEvent now  creates a copy mdcPropertiesMap. 
It follows that if the MDC is subsequently modified, the logging events are not impacted.

SMTPAppender in lb-classic now invokes event.prepareForDeferredProcessing() method in subAppend().

Added relevant test case.

Related to LBCORE-83.
 

- added blurb in the news about ViewStatusServlet

- Added StatusMessage viewer servlet for lb-classic called ViewStatusMessagesServlet. 

- Added StatusMessage viewer servlet for lb-access called ViewStatusMessagesServlet. 
  It works with Tomcat but not Jetty.

- Added relevant documentation.

- the section on logback initialization references the FAQ entry (location of config 
  files on the class path). This fixes LBSITE-20.
- minor enhancements in architecture.html relating to the basic selection rule
- updates to news.html

- LoggerContext reset, registered turbo filters are first stopped before being 
  unregistered. This fixes LBCLASSIC-89.
    

  automatically print status data on the console in case of warnings
  as well as errors. Previously, status data was printed only in
  case of errors.

- In case multiple configuration files are found on the class
  path, ContextInitializer will now emit a warning. This fixes 
  LBCLASSIC-85.

Documentation enhancements. Closing LBCLASSIC-30

ContextInitializer now prints the url it uses for default configuration.
This was requested in LBCLASSIC-55.

- Fix LBCORE-74
  
  HTMLLayoutBase now takes into custom conversion words.
  
- Moved StringListAppender to c.q.l.classic.testUtil package

- cleaned up config files so that "level" is an XML attribute and not
  an XML element

- updated Gmail related examples

- LBCLASSIC-100

  Evaluators are now wired into an appender automatically (implicit
  rules) without the help of EvaluatorAction. EvaluatorAction is now
  only needed for global evaluator elements.

  It follows that name attribute is necessary only for global
  evaluators. Embedded evaluators no longer need a name.

  EvaluatorAction has been modified to accept evaluators of any type
  and not just JaninoEvaluators.

- add tests for verifying that parameter types which are concrete classes 
  can be instantiated by implicit actions
- ongoing work on evaluators