title: How to give dynamic filepath in appender tag in log4j_config.xml?
body: <p>Hi I am using log4j api to log the informations. I have used log4j_conffig.xml file for creating the log files. I have given the absolute path for each log file in param tag value.</p>
  
  <p>eg :</p>
  
  <pre><code>appender name="GPREPROCESSOR_DEBUG" class="org.apache.log4j.DailyRollingFileAppender"&gt;&lt;br&gt;
          param name="DatePattern" value="'_'yyyyMMdd"/&gt;&lt;br&gt;
          param name="File" value="D:/logFiles/GPreprocessor_Debug.log"/&gt;&lt;br&gt;
          layout class="com.dnb.genericpreprocessor.common.log.AppXMLLayout"/&gt;&lt;br&gt;
  /appender&gt;&lt;br&gt;
  </code></pre>
  
  <p>i do not want to give "D:/logFiles/" directly.Actually that path is dynamic based on my project location. so how can i give that</p>