Log session session information (Web)

[Renan Vinícius Mozone]

    I'm planning to use log4j on a JSP based application. However, every log
entry must have a session identification. This session identification is in
a session variable.
    How can I configure the formatter to achieve this?

    The log entry must be something like this:

    [TIMESTAMP] [THREAD] [LOG LEVEL] [SESSION ID] [MESSAGE]

    Thanks in advance.