title: What is the option to "append" in Logback RollingFileAppender?
body: <p>I have a simple question for using logback.
  I am using Logback for my application with RollingFileAppender.
  It works well but when I restart my application, It won't append existing file but gone somewhere.</p>
  
  <p>Here is xml file for logback configuration for my application.</p>
  
  <pre><code> &lt;appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"&gt;
      &lt;rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"&gt;
          &lt;!-- hourly rollover --&gt;
          &lt;fileNamePattern&gt;/home/log/logFile.%d{yyyy-MM-dd}.log&lt;/fileNamePattern&gt;
          &lt;timeBasedFileNamingAndTriggeringPolicy
                  class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP"&gt;
              &lt;!-- or whenever the file size reaches 100MB --&gt;
              &lt;maxFileSize&gt;100MB&lt;/maxFileSize&gt;
          &lt;/timeBasedFileNamingAndTriggeringPolicy&gt;
          &lt;!-- keep 30 hours' worth of history --&gt;
          &lt;maxHistory&gt;30&lt;/maxHistory&gt;
      &lt;/rollingPolicy&gt;
      &lt;encoder&gt;
          &lt;pattern&gt;%-4r [%thread] %X{clientIP} %d{HH:mm:ss.SSS} [%p] [%thread@%C{1}:%L] - %m%n&lt;/pattern&gt;
      &lt;/encoder&gt;
  &lt;/appender&gt;
  </code></pre>
  
  <p>For example, when I first start application, It creates a log file in accordance with configuration above. </p>
  
  <pre><code>-rw-r--r-- 1 root root      6926 Nov  7 10:19 logFile.2015-11-07.log
  </code></pre>
  
  <p>But if I stop application and restart, I expect log to be appended on above file but It won't ( I even couldn't find where this missing log exist. )</p>
  
  <p>Thanks in advance.</p>