[logback-dev] [JIRA] Created: (LBCLASSIC-185) Servlet filter which puts servlet-specific data into MDC

[Torsten Juergeleit (JIRA)]

Servlet filter which puts servlet-specific data into MDC
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                 Key: LBCLASSIC-185
                 URL: http://jira.qos.ch/browse/LBCLASSIC-185
             Project: logback-classic
          Issue Type: New Feature
          Components: Other
    Affects Versions: 0.9.18
            Reporter: Torsten Juergeleit
            Assignee: Logback dev list


Attached you can find a servlet filter which implements a strategy to put servlet-specific data into the SL4F MDC using the following keys: 

* {{slf4j.servlet.requestId}} - Unique ID of the single HTTP request handled by this filter 
* {{slf4j.servlet.sessionId}} - ID of the HTTP session this HTTP request is associated with or "" if no HTTP session was created yet 
* {{slf4j.servlet.contextPath}} - Web apps context path 
* {{slf4j.servlet.userName}} - Name of authenticated user or "" if no user is authenticated 

This data is removed after the request is processed. 

The following configuration parameters are supported by this filter: 

* {{maxSessionIdLength}} - limiting the HTTP session id length to a certain value, e.g. for WebLogic this could be 52 (default: -1 [unlimited]) 

To use this filter add the following lines to the {{web.xml file}}: 

<code>
  <filter>
    <filter-name>RequestLogFilter</filter-name>
    <filter-class>ch.qos.logback.classic.RequestLogFilter</filter-class>
    <init-param>
      <param-name>maxSessionIdLength</param-name>
      <param-value>52</param-value>
    </init-param>
  </filter><br>
      :
  <filter-mapping>
    <filter-name>RequestLogFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
<code>

An SLF4 Logger named {{ch.qos.logback.classic.RequestLogFilter}} is used to log the start end end of calling the filter chain. This information should go into a separate log file.

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